{"id":3453,"date":"2025-11-26T07:11:08","date_gmt":"2025-11-26T07:11:08","guid":{"rendered":"https:\/\/nbaem.com\/?p=3453"},"modified":"2025-11-25T05:53:26","modified_gmt":"2025-11-25T05:53:26","slug":"is-cobalt-magnetic","status":"publish","type":"post","link":"https:\/\/nbaem.com\/vi\/is-cobalt-magnetic\/","title":{"rendered":"Cobalt c\u00f3 t\u1eeb t\u00ednh Kh\u00e1m ph\u00e1 \u0111\u1ed9 m\u1ea1nh, nhi\u1ec7t \u0111\u1ed9 v\u00e0 \u1ee9ng d\u1ee5ng c\u1ee7a n\u00f3"},"content":{"rendered":"<p><strong>Cobalt c\u00f3 t\u1eeb t\u00ednh kh\u00f4ng?<\/strong> Ch\u1eafc ch\u1eafn\u2014<strong>cobalt<\/strong> l\u00e0 m\u1ed9t trong nh\u1eefng kim lo\u1ea1i hi\u1ebfm t\u1ef1 nhi\u00ean <strong>s\u1eaft t\u1eeb<\/strong> \u1edf nhi\u1ec7t \u0111\u1ed9 ph\u00f2ng, \u0111\u1ee9ng c\u00f9ng v\u1edbi s\u1eaft v\u00e0 niken. \u0110i\u1ec1u g\u00ec l\u00e0m cho cobalt kh\u00e1c bi\u1ec7t? N\u00f3 <strong>nhi\u1ec7t \u0111\u1ed9 Curie<\/strong> \u0111\u1ee9ng \u0111\u1ea7u danh s\u00e1ch \u1edf 1121 \u00b0C, c\u00f3 ngh\u0129a l\u00e0 n\u00f3 duy tr\u00ec t\u1eeb t\u00ednh l\u00e2u h\u01a1n nhi\u1ec1u d\u01b0\u1edbi nhi\u1ec7t \u0111\u1ed9 cao. D\u00f9 b\u1ea1n t\u00f2 m\u00f2 v\u1ec1 \u0111\u1ed9 m\u1ea1nh c\u1ee7a n\u00f3, c\u00e1ch n\u00f3 so s\u00e1nh v\u1edbi nam ch\u00e2m neodymium, hay vai tr\u00f2 c\u1ee7a n\u00f3 trong c\u00e1c \u1ee9ng d\u1ee5ng nhi\u1ec7t \u0111\u1ed9 cao, h\u01b0\u1edbng d\u1eabn n\u00e0y gi\u00fap b\u1ea1n lo\u1ea1i b\u1ecf nhi\u1ec5u \u0111\u1ec3 cung c\u1ea5p nh\u1eefng th\u00f4ng tin r\u00f5 r\u00e0ng, ch\u00ednh x\u00e1c m\u00e0 b\u1ea1n c\u1ea7n. H\u00e3y c\u00f9ng t\u00ecm hi\u1ec3u l\u00fd do t\u1ea1i sao t\u00ednh ch\u1ea5t t\u1eeb c\u1ee7a cobalt v\u1eabn c\u00f2n quan tr\u1ecdng ng\u00e0y nay.<\/p>\n<div id=\"attachment_3452\" style=\"width: 537px\" class=\"wp-caption alignnone\"><img decoding=\"async\" aria-describedby=\"caption-attachment-3452\" class=\"wp-image-3452\" src=\"https:\/\/nbaem.com\/wp-content\/uploads\/2025\/11\/Is_cobalt_magnetic_O6cqcnx2r.webp\" alt=\"Cobalt c\u00f3 t\u1eeb t\u00ednh kh\u00f4ng\" width=\"527\" height=\"527\" srcset=\"https:\/\/nbaem.com\/wp-content\/uploads\/2025\/11\/Is_cobalt_magnetic_O6cqcnx2r-12x12.webp 12w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/11\/Is_cobalt_magnetic_O6cqcnx2r-66x66.webp 66w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/11\/Is_cobalt_magnetic_O6cqcnx2r-150x150.webp 150w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/11\/Is_cobalt_magnetic_O6cqcnx2r-200x200.webp 200w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/11\/Is_cobalt_magnetic_O6cqcnx2r-300x300.webp 300w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/11\/Is_cobalt_magnetic_O6cqcnx2r-400x400.webp 400w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/11\/Is_cobalt_magnetic_O6cqcnx2r-600x600.webp 600w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/11\/Is_cobalt_magnetic_O6cqcnx2r-768x768.webp 768w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/11\/Is_cobalt_magnetic_O6cqcnx2r-800x800.webp 800w, https:\/\/nbaem.com\/wp-content\/uploads\/2025\/11\/Is_cobalt_magnetic_O6cqcnx2r.webp 1024w\" sizes=\"(max-width: 527px) 100vw, 527px\" \/><p id=\"caption-attachment-3452\" class=\"wp-caption-text\">Cobalt c\u00f3 t\u1eeb t\u00ednh kh\u00f4ng<\/p><\/div>\n<h2>Khoa h\u1ecdc: T\u1ea1i sao Cobalt l\u1ea1i c\u00f3 t\u00ednh t\u1eeb<\/h2>\n<p>C\u00f3, cobalt c\u00f3 t\u1eeb t\u00ednh\u2014c\u1ee5 th\u1ec3, n\u00f3 l\u00e0 <strong>s\u1eaft t\u1eeb<\/strong>. Nh\u01b0ng t\u1ea1i sao? C\u00e2u tr\u1ea3 l\u1eddi n\u1eb1m s\u00e2u trong c\u1ea5u tr\u00fac nguy\u00ean t\u1eed v\u00e0 c\u00e1c mi\u1ec1n t\u1eeb c\u1ee7a n\u00f3.<\/p>\n<h3>C\u1ea5u h\u00ecnh electron v\u00e0 c\u00e1c electron 3d kh\u00f4ng gh\u00e9p \u0111\u00f4i<\/h3>\n<ul>\n<li>Cobalt c\u00f3 c\u1ea5u h\u00ecnh electron:<br \/>\n<strong>[Ar] 3d\u2077 4s\u00b2<\/strong><\/li>\n<li>Trong s\u1ed1 b\u1ea3y electron 3d, <strong>m\u1ed9t s\u1ed1 c\u00f2n l\u1ea1i kh\u00f4ng gh\u00e9p \u0111\u00f4i<\/strong>.<\/li>\n<li>Nh\u1eefng electron kh\u00f4ng gh\u00e9p \u0111\u00f4i n\u00e0y c\u00f3 spins ho\u1ea1t \u0111\u1ed9ng nh\u01b0 nh\u1eefng nam ch\u00e2m nh\u1ecf.<\/li>\n<li>Khi nhi\u1ec1u spins c\u00f9ng h\u01b0\u1edbng, ch\u00fang t\u1ea1o ra m\u1ed9t <strong>l\u0129nh v\u1ef1c t\u1eeb m\u1ea1nh m\u1ebd<\/strong>.<\/li>\n<\/ul>\n<h3>C\u00e1c mi\u1ec1n t\u1eeb v\u00e0 T\u1eeb t\u00ednh t\u1ef1 ph\u00e1t<\/h3>\n<ul>\n<li>C\u00e1c nguy\u00ean t\u1eed cobalt t\u1eadp h\u1ee3p th\u00e0nh c\u00e1c v\u00f9ng nh\u1ecf g\u1ecdi l\u00e0 <strong>mi\u1ec1n t\u1eeb<\/strong>.<\/li>\n<li>B\u00ean trong m\u1ed7i mi\u1ec1n, c\u00e1c spin electron x\u1ebfp \u0111\u1ec1u nhau.<\/li>\n<li>D\u00f9 c\u00e1c mi\u1ec1n trong m\u1ed9t m\u1ea3nh kh\u00f4ng t\u1eeb h\u01b0\u1edbng \u0111\u1ec1u, khi ch\u00fang \u0111\u01b0\u1ee3c c\u0103n ch\u1ec9nh, nh\u1eefng mi\u1ec1n n\u00e0y t\u1ea1o ra <strong>t\u1eeb t\u00ednh t\u1ef1 ph\u00e1t<\/strong>, mang l\u1ea1i s\u1ee9c m\u1ea1nh t\u1eeb t\u00ednh cho cobalt.<\/li>\n<\/ul>\n<h3>T\u1eeb t\u00ednh s\u1eaft ferromagnetic so v\u1edbi t\u1eeb t\u00ednh paramagnetic v\u00e0 diamagnetic<\/h3>\n<table>\n<thead>\n<tr>\n<th>Thu\u1ed9c t\u00ednh<\/th>\n<th>S\u1eaft ferromagnetic (Cobalt)<\/th>\n<th>V\u1eadt li\u1ec7u t\u1eeb thu\u1eadn<\/th>\n<th>V\u1eadt li\u1ec7u t\u1eeb ch\u1ed1ng<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>C\u0103n ch\u1ec9nh spin electron<\/td>\n<td>M\u1ea1nh, t\u1ef1 ph\u00e1t<\/td>\n<td>Y\u1ebfu, ch\u1ec9 khi c\u00f3 t\u1eeb tr\u01b0\u1eddng<\/td>\n<td>Ph\u1ea3n \u0111\u1ed1i t\u1eeb tr\u01b0\u1eddng b\u00ean ngo\u00e0i<\/td>\n<\/tr>\n<tr>\n<td>H\u00e0nh vi t\u1eeb tr\u01b0\u1eddng<\/td>\n<td>T\u1eeb t\u00ednh v\u0129nh vi\u1ec5n<\/td>\n<td>T\u1eeb t\u00ednh t\u1ea1m th\u1eddi<\/td>\n<td>S\u1ef1 \u0111\u1ea9y y\u1ebfu r\u1ea5t y\u1ebfu<\/td>\n<\/tr>\n<tr>\n<td>V\u00ed d\u1ee5 ph\u1ed5 bi\u1ebfn<\/td>\n<td>Cobalt, s\u1eaft, niken<\/td>\n<td>Nh\u00f4m, b\u1ea1ch kim<\/td>\n<td>\u0110\u1ed3ng, v\u00e0ng, bismuth<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>N\u00f3i ng\u1eafn g\u1ecdn, cobalt c\u00f3 <strong>electron kh\u00f4ng gh\u00e9p \u0111\u00f4i v\u00e0 c\u1ea5u tr\u00fac mi\u1ec1n<\/strong> l\u00e0 m\u1ed9t nguy\u00ean t\u1ed1 ferromagnetic \u0111i\u1ec3n h\u00ecnh, c\u00f3 kh\u1ea3 n\u0103ng tr\u1edf th\u00e0nh nam ch\u00e2m v\u0129nh vi\u1ec5n m\u1ea1nh khi \u0111\u01b0\u1ee3c t\u1eeb h\u00f3a.<\/p>\n<h2>Cobalt m\u1ea1nh nh\u01b0 th\u1ebf n\u00e0o so v\u1edbi c\u00e1c v\u1eadt li\u1ec7u t\u1eeb kh\u00e1c?<\/h2>\n<p>Cobalt tinh khi\u1ebft c\u00f3 \u0111\u1ed9 b\u00e3o h\u00f2a t\u1eeb kho\u1ea3ng 1,79 Tesla (T), c\u00f3 ngh\u0129a l\u00e0 n\u00f3 c\u00f3 th\u1ec3 t\u1ea1o ra m\u1ed9t tr\u01b0\u1eddng t\u1eeb m\u1ea1nh khi \u0111\u01b0\u1ee3c t\u1eeb h\u00f3a ho\u00e0n to\u00e0n. \u0110\u1ec3 so s\u00e1nh, s\u1eaft cao h\u01a1n m\u1ed9t ch\u00fat \u1edf kho\u1ea3ng 2,15 T, c\u00f2n niken th\u1ea5p h\u01a1n, kho\u1ea3ng 0,6 T. Nh\u01b0ng kim lo\u1ea1i tinh khi\u1ebft hi\u1ebfm khi k\u1ec3 h\u1ebft c\u00e2u chuy\u1ec7n trong c\u00e1c nam ch\u00e2m th\u1ef1c t\u1ebf.<\/p>\n<p>\u0110\u00e2y l\u00e0 c\u00e1i nh\u00ecn nhanh v\u1ec1 c\u00e1ch cobalt tinh khi\u1ebft so s\u00e1nh v\u1edbi c\u00e1c v\u1eadt li\u1ec7u t\u1eeb th\u00f4ng th\u01b0\u1eddng:<\/p>\n<table>\n<thead>\n<tr>\n<th>V\u1eadt li\u1ec7u<\/th>\n<th>\u0110\u1ed9 b\u00e3o h\u00f2a t\u1eeb (T)<\/th>\n<th>S\u1eed d\u1ee5ng \u0111i\u1ec3n h\u00ecnh<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Cobalt tinh khi\u1ebft (Co)<\/td>\n<td>1.79<\/td>\n<td>Hi\u1ebfm khi \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng ri\u00eang trong nam ch\u00e2m<\/td>\n<\/tr>\n<tr>\n<td>S\u1eaft (Fe)<\/td>\n<td>2.15<\/td>\n<td>V\u1eadt li\u1ec7u t\u1eeb c\u1ed1t l\u00f5i<\/td>\n<\/tr>\n<tr>\n<td>Nickel (Ni)<\/td>\n<td>0.6<\/td>\n<td>N\u1ec1n t\u1ea3ng h\u1ee3p kim<\/td>\n<\/tr>\n<tr>\n<td>Alnico (Al-Ni-Co)<\/td>\n<td>~1.0<\/td>\n<td>\u0110\u1ed9 m\u1ea1nh trung b\u00ecnh, \u1ed5n \u0111\u1ecbnh nhi\u1ec7t \u0111\u1ed9<\/td>\n<\/tr>\n<tr>\n<td>Samari-Coban (SmCo)<\/td>\n<td>0.9 &#8211; 1.1<\/td>\n<td>Nam ch\u00e2m nhi\u1ec7t \u0111\u1ed9 cao, \u0111\u1ea5t hi\u1ebfm<\/td>\n<\/tr>\n<tr>\n<td>Neodymium (NdFeB)<\/td>\n<td>1.2 &#8211; 1.4<\/td>\n<td>Nam ch\u00e2m th\u01b0\u01a1ng m\u1ea1i m\u1ea1nh nh\u1ea5t<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>V\u1ec1 m\u1eb7t <strong>Hi\u1ec7u su\u1ea5t th\u1ef1c t\u1ebf<\/strong>, nam ch\u00e2m \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 b\u1eb1ng nhi\u1ec1u y\u1ebfu t\u1ed1 h\u01a1n l\u00e0 s\u1ee9c m\u1ea1nh thu\u1ea7n t\u00fay. \u0110\u1ed9 d\u01b0 t\u1eeb (t\u1eeb t\u00ednh c\u00f2n l\u1ea1i), \u0111\u1ed9 c\u1ea3n t\u1eeb (kh\u00e1ng l\u1ea1i qu\u00e1 tr\u00ecnh m\u1ea5t t\u1eeb), v\u00e0 s\u1ea3n ph\u1ea9m n\u0103ng l\u01b0\u1ee3ng (\u0111\u1ed9 t\u1eadp trung n\u0103ng l\u01b0\u1ee3ng t\u1ed1i \u0111a) \u0111\u1ec1u quan tr\u1ecdng:<\/p>\n<ul>\n<li><a href=\"https:\/\/nbaem.com\/vi\/products\/samarium-cobalt-magnets\/\" target=\"_blank\" rel=\"noopener\"><span style=\"color: #0000ff;\"><strong>Samari-Coban (SmCo)<\/strong> <\/span><\/a>nam ch\u00e2m \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 cao v\u1ec1 kh\u1ea3 n\u0103ng c\u1ea3n t\u1eeb xu\u1ea5t s\u1eafc v\u00e0 \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh nhi\u1ec7t \u0111\u1ed9, v\u1edbi s\u1ea3n ph\u1ea9m n\u0103ng l\u01b0\u1ee3ng l\u00ean t\u1edbi 28 MGOe.<\/li>\n<li><a href=\"https:\/\/nbaem.com\/vi\/products\/neodymium-magnet\/\" target=\"_blank\" rel=\"noopener\"><strong><span style=\"color: #0000ff;\">Nam ch\u00e2m neodymium (NdFeB)<\/span><\/strong> <\/a>d\u1eabn \u0111\u1ea7u v\u1ec1 s\u1ee9c m\u1ea1nh thu\u1ea7n t\u00fay, v\u1edbi s\u1ea3n ph\u1ea9m n\u0103ng l\u01b0\u1ee3ng tr\u00ean 50 MGOe, nh\u01b0ng m\u1ea5t hi\u1ec7u su\u1ea5t \u1edf nhi\u1ec7t \u0111\u1ed9 cao h\u01a1n.<\/li>\n<li><a href=\"https:\/\/nbaem.com\/vi\/products\/alnico-magnet\/\" target=\"_blank\" rel=\"noopener\"><span style=\"color: #0000ff;\"><strong>Nam ch\u00e2m Alnico<\/strong><\/span><\/a>, bao g\u1ed3m cobalt, cung c\u1ea5p \u0111\u1ed9 m\u1ea1nh trung b\u00ecnh nh\u01b0ng \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh nhi\u1ec7t \u0111\u1ed9 v\u01b0\u1ee3t tr\u1ed9i v\u00e0 \u00edt gi\u00f2n h\u01a1n.<\/li>\n<\/ul>\n<p>Trong khi \u0111\u1ed9 m\u1ea1nh t\u1eeb thu\u1ea7n c\u1ee7a cobalt kh\u00f4ng ph\u00e1 k\u1ef7 l\u1ee5c, gi\u00e1 tr\u1ecb c\u1ee7a n\u00f3 t\u1ecfa s\u00e1ng trong c\u00e1c h\u1ee3p kim v\u00e0 nam ch\u00e2m v\u0129nh c\u1eedu, \u0111\u1eb7c bi\u1ec7t n\u01a1i c\u1ea7n ch\u1ed1ng nhi\u1ec7t t\u1ed1t.<\/p>\n<p>Khi n\u00f3i \u0111\u1ebfn nam ch\u00e2m cobalt, hai lo\u1ea1i ch\u00ednh b\u1ea1n s\u1ebd th\u1ea5y tr\u00ean th\u1ecb tr\u01b0\u1eddng l\u00e0 <strong>Nam ch\u00e2m Samarium-Cobalt (SmCo)<\/strong> v\u00e0 <strong>Nam ch\u00e2m Alnico (Al-Ni-Co)<\/strong>.<\/p>\n<h3>Nam ch\u00e2m Samarium-Cobalt (SmCo)<\/h3>\n<p>Nam ch\u00e2m SmCo c\u00f3 hai lo\u1ea1i c\u1ea5p ph\u1ed5 bi\u1ebfn: <strong>1:5<\/strong> v\u00e0 <strong>2:17<\/strong> (\u0111\u1ec1 c\u1eadp \u0111\u1ebfn t\u1ef7 l\u1ec7 c\u1ee7a samarium so v\u1edbi cobalt trong h\u1ee3p kim). Nh\u1eefng nam ch\u00e2m n\u00e0y \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 cao v\u00ec <strong>kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t c\u1ef1c cao<\/strong>, c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng \u1ed5n \u0111\u1ecbnh \u1edf nhi\u1ec7t \u0111\u1ed9 kho\u1ea3ng <strong>350 \u00b0C<\/strong>, khi\u1ebfn ch\u00fang tr\u1edf th\u00e0nh m\u1ed9t trong nh\u1eefng nam ch\u00e2m v\u0129nh c\u1eedu ch\u1ecbu nhi\u1ec7t t\u1ed1t nh\u1ea5t hi\u1ec7n c\u00f3. Ch\u00fang c\u0169ng ch\u1ed1ng \u0103n m\u00f2n t\u1ed1t, v\u00ec v\u1eady kh\u00f4ng c\u1ea7n l\u1edbp ph\u1ee7 b\u1ed5 sung.<\/p>\n<p><strong>\u01afu \u0111i\u1ec3m:<\/strong><\/p>\n<ul>\n<li>\u1ed4n \u0111\u1ecbnh nhi\u1ec7t v\u01b0\u1ee3t tr\u1ed9i<\/li>\n<li>Ch\u1ed1ng \u0103n m\u00f2n cao<\/li>\n<li>Hi\u1ec7u su\u1ea5t t\u1eeb tr\u01b0\u1eddng m\u1ea1nh m\u1ebd, \u1ed5n \u0111\u1ecbnh \u1edf nhi\u1ec7t \u0111\u1ed9 cao<\/li>\n<\/ul>\n<p><strong>Nh\u01b0\u1ee3c \u0111i\u1ec3m:<\/strong><\/p>\n<ul>\n<li>Gi\u00f2n v\u00e0 d\u1ec5 b\u1ecb v\u1ee1 ho\u1eb7c n\u1ee9t n\u1ebfu x\u1eed l\u00fd kh\u00f4ng c\u1ea9n th\u1eadn<\/li>\n<li>\u0110\u1eaft h\u01a1n so v\u1edbi c\u00e1c lo\u1ea1i nam ch\u00e2m kh\u00e1c<\/li>\n<li>Th\u00f4ng th\u01b0\u1eddng kh\u00f4ng m\u1ea1nh b\u1eb1ng nam ch\u00e2m neodymium (NdFeB) v\u1ec1 s\u1ee9c m\u1ea1nh t\u1eeb tr\u01b0\u1eddng ban \u0111\u1ea7u<\/li>\n<\/ul>\n<h3>Nam ch\u00e2m Alnico (Al-Ni-Co)<\/h3>\n<p>Nam ch\u00e2m Alnico, l\u00e0m t\u1eeb nh\u00f4m, nickel v\u00e0 cobalt, \u0111\u00e3 t\u1ed3n t\u1ea1i t\u1eeb \u0111\u1ea7u th\u1ebf k\u1ef7 20. M\u1eb7c d\u00f9 kh\u00f4ng \u0111\u1ea1t \u0111\u01b0\u1ee3c \u0111\u1ed9 m\u1ea1nh t\u1eeb tr\u01b0\u1eddng c\u1ee7a nam ch\u00e2m SmCo ho\u1eb7c neodymium, nam ch\u00e2m Alnico cung c\u1ea5p <strong>\u0111\u1ed9 m\u1ea1nh trung b\u00ecnh<\/strong> v\u00e0 n\u1ed5i ti\u1ebfng v\u1edbi <strong>\u1ed5n \u0111\u1ecbnh nhi\u1ec7t tuy\u1ec7t v\u1eddi<\/strong>, ch\u1ecbu nhi\u1ec7t t\u1ed1t h\u01a1n nhi\u1ec1u lo\u1ea1i nam ch\u00e2m kh\u00e1c tr\u01b0\u1edbc khi nam ch\u00e2m SmCo tr\u1edf n\u00ean ph\u1ed5 bi\u1ebfn.<\/p>\n<p><strong>\u0110\u1eb7c \u0111i\u1ec3m ch\u00ednh:<\/strong><\/p>\n<ul>\n<li>\u1ed4n \u0111\u1ecbnh nhi\u1ec7t \u0111\u1ed9 t\u1ed1t (t\u1ed1t h\u01a1n h\u1ea7u h\u1ebft tr\u1eeb SmCo)<\/li>\n<li>B\u1ec1n v\u00e0 c\u01a1 h\u1ecdc c\u1ee9ng h\u01a1n SmCo<\/li>\n<li>\u0110\u1ed9 m\u1ea1nh t\u1eeb tr\u01b0\u1eddng v\u1eeba ph\u1ea3i<\/li>\n<li>Quan tr\u1ecdng trong l\u1ecbch s\u1eed tr\u01b0\u1edbc khi nam ch\u00e2m \u0111\u1ea5t hi\u1ebfm chi\u1ebfm \u01b0u th\u1ebf<\/li>\n<\/ul>\n<p>C\u1ea3 hai lo\u1ea1i \u0111\u1ec1u ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c l\u0129nh v\u1ef1c quan tr\u1ecdng t\u00f9y thu\u1ed9c v\u00e0o nhu c\u1ea7u c\u1ee7a b\u1ea1n\u2014d\u00f9 l\u00e0 kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t c\u1ef1c cao hay \u0111\u1ed9 c\u00e2n b\u1eb1ng gi\u1eefa s\u1ee9c m\u1ea1nh v\u00e0 \u0111\u1ed9 b\u1ec1n. N\u1ebfu b\u1ea1n mu\u1ed1n nam ch\u00e2m c\u00f3 kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t xu\u1ea5t s\u1eafc, samarium-cobalt th\u01b0\u1eddng l\u00e0 l\u1ef1a ch\u1ecdn h\u00e0ng \u0111\u1ea7u, \u0111\u1eb7c bi\u1ec7t trong ng\u00e0nh h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5 ho\u1eb7c c\u00e1c \u1ee9ng d\u1ee5ng c\u00f4ng nghi\u1ec7p \u0111\u1eb7c th\u00f9.<\/p>\n<p>\u0110\u1ed1i v\u1edbi nh\u1eefng ng\u01b0\u1eddi mu\u1ed1n m\u1ed9t l\u1ef1a ch\u1ecdn c\u00f3 hi\u1ec7u su\u1ea5t \u1ed5n \u0111\u1ecbnh v\u00e0 \u00edt gi\u00f2n h\u01a1n, nam ch\u00e2m Alnico v\u1eabn c\u00f2n ph\u00f9 h\u1ee3p m\u1eb7c d\u00f9 c\u00f3 c\u00f4ng ngh\u1ec7 m\u1edbi h\u01a1n.<\/p>\n<p>N\u1ebfu b\u1ea1n \u0111ang kh\u00e1m ph\u00e1 nam ch\u00e2m cobalt cho c\u00e1c \u1ee9ng d\u1ee5ng c\u00f4ng nghi\u1ec7p ho\u1eb7c n\u0103ng l\u01b0\u1ee3ng xanh, \u0111\u00e1ng \u0111\u1ec3 so s\u00e1nh c\u00e1c l\u1ef1a ch\u1ecdn n\u00e0y tr\u00ean c\u00e1c trang web chuy\u00ean v\u1ec1 <a href=\"https:\/\/nbaem.com\/vi\/magnets-for-green-energy\/\" target=\"_blank\" rel=\"noopener\">nam ch\u00e2m cho n\u0103ng l\u01b0\u1ee3ng xanh<\/a> \u0111\u1ec3 xem c\u00e1i n\u00e0o ph\u00f9 h\u1ee3p nh\u1ea5t v\u1edbi \u1ee9ng d\u1ee5ng c\u1ee7a b\u1ea1n.<\/p>\n<h2>Nhi\u1ec7t \u0111\u1ed9 v\u00e0 T\u1eeb t\u00ednh: Si\u00eau n\u0103ng l\u1ef1c c\u1ee7a Cobalt<\/h2>\n<p>\u01afu \u0111i\u1ec3m l\u1edbn nh\u1ea5t c\u1ee7a cobalt v\u1ec1 t\u1eeb t\u00ednh l\u00e0 nhi\u1ec7t \u0111\u1ed9 Curie c\u1ef1c cao c\u1ee7a n\u00f3\u2014\u0111i\u1ec3m m\u00e0 n\u00f3 m\u1ea5t \u0111i t\u1eeb t\u00ednh. Cobalt tinh khi\u1ebft gi\u1eef v\u1eefng t\u1eeb t\u00ednh \u0111\u1ebfn kho\u1ea3ng <strong>1121 \u00b0C<\/strong>, cao h\u01a1n nhi\u1ec1u so v\u1edbi s\u1eaft ho\u1eb7c niken. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 nam ch\u00e2m d\u1ef1a tr\u00ean cobalt c\u00f3 th\u1ec3 duy tr\u00ec s\u1ee9c m\u1ea1nh t\u1eeb t\u00ednh ngay c\u1ea3 trong nhi\u1ec7t \u0111\u1ed9 c\u1ef1c cao.<\/p>\n<p>Nam ch\u00e2m Samarium-Cobalt (SmCo), k\u1ebft h\u1ee3p cobalt v\u1edbi c\u00e1c nguy\u00ean t\u1ed1 \u0111\u1ea5t hi\u1ebfm, c\u00f3 nhi\u1ec7t \u0111\u1ed9 Curie th\u1ea5p h\u01a1n kho\u1ea3ng <strong>300-350 \u00b0C<\/strong>. M\u1eb7c d\u00f9 th\u1ea5p h\u01a1n nhi\u1ec1u so v\u1edbi cobalt tinh khi\u1ebft, nh\u01b0ng v\u1eabn cao h\u01a1n nhi\u1ec1u so v\u1edbi nam ch\u00e2m neodymium \u0111i\u1ec3n h\u00ecnh. V\u00ec l\u00fd do n\u00e0y, nam ch\u00e2m SmCo \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 cao trong c\u00e1c ng\u00e0nh nh\u01b0 h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5 v\u00e0 kh\u00e1m ph\u00e1 kh\u00f4ng gian, n\u01a1i nam ch\u00e2m ph\u1ea3i ho\u1ea1t \u0111\u1ed9ng \u0111\u00e1ng tin c\u1eady \u1edf nhi\u1ec7t \u0111\u1ed9 cao, nh\u01b0 trong \u0111\u1ed9ng c\u01a1 ph\u1ea3n l\u1ef1c.<\/p>\n<p>Nh\u1edd kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t n\u00e0y, nam ch\u00e2m SmCo v\u1eabn l\u00e0 l\u1ef1a ch\u1ecdn h\u00e0ng \u0111\u1ea7u cho m\u00f4i tr\u01b0\u1eddng kh\u1eafc nghi\u1ec7t, n\u00f3ng b\u1ecfng n\u01a1i m\u00e0 c\u00e1c lo\u1ea1i kh\u00e1c s\u1ebd th\u1ea5t b\u1ea1i. \u0110i\u1ec1u n\u00e0y l\u00e0m cho t\u00ednh ch\u1ea5t t\u1eeb c\u1ee7a cobalt tr\u1edf n\u00ean c\u1ef1c k\u1ef3 qu\u00fd gi\u00e1 v\u01b0\u1ee3t ra ngo\u00e0i ch\u1ec9 s\u1ee9c m\u1ea1nh ho\u1eb7c k\u00edch th\u01b0\u1edbc thu\u1ea7n t\u00fay.<\/p>\n<p>\u0110\u1ec3 bi\u1ebft th\u00eam v\u1ec1 c\u00e1ch c\u00e1c lo\u1ea1i nam ch\u00e2m kh\u00e1c nhau ho\u1ea1t \u0111\u1ed9ng d\u01b0\u1edbi nhi\u1ec7t, b\u1ea1n c\u00f3 th\u1ec3 xem th\u00f4ng tin chi ti\u1ebft v\u1ec1<span style=\"color: #993300;\"><strong> <a style=\"color: #993300;\" href=\"https:\/\/nbaem.com\/vi\/anisotropic-magnet-vs-isotropic-magnet\/\" target=\"_blank\" rel=\"noopener\">nam ch\u00e2m d\u1ecb h\u01b0\u1edbng so v\u1edbi nam ch\u00e2m \u0111a h\u01b0\u1edbng<\/a>.<\/strong><\/span><\/p>\n<h2>C\u00f3 ph\u1ea3i Cobalt tinh khi\u1ebft \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0m nam ch\u00e2m trong ng\u00e0nh c\u00f4ng nghi\u1ec7p?<\/h2>\n<p>Cobalt tinh khi\u1ebft hi\u1ebfm khi \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0m nam ch\u00e2m trong ng\u00e0nh c\u00f4ng nghi\u1ec7p. M\u1eb7c d\u00f9 n\u00f3 t\u1ef1 nhi\u00ean c\u00f3 t\u00ednh t\u1eeb ferromagnetic, nh\u01b0ng chi ph\u00ed v\u00e0 \u0111\u1ed9 y\u1ebfu c\u01a1 h\u1ecdc c\u1ee7a n\u00f3 khi\u1ebfn n\u00f3 kh\u00f4ng th\u1ef1c t\u1ebf cho h\u1ea7u h\u1ebft c\u00e1c \u1ee9ng d\u1ee5ng. Thay v\u00e0o \u0111\u00f3, c\u00e1c ng\u00e0nh c\u00f4ng nghi\u1ec7p th\u00edch h\u1ee3p kim cobalt ho\u1eb7c nam ch\u00e2m d\u1ef1a tr\u00ean cobalt nh\u01b0 samarium-cobalt (SmCo) mang l\u1ea1i hi\u1ec7u su\u1ea5t v\u00e0 \u0111\u1ed9 b\u1ec1n t\u1ed1t h\u01a1n. Th\u1ec9nh tho\u1ea3ng, b\u1ed9t cobalt li\u00ean k\u1ebft \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c thi\u1ebft k\u1ebf nam ch\u00e2m \u0111\u1eb7c th\u00f9, nh\u01b0ng nh\u1eefng tr\u01b0\u1eddng h\u1ee3p n\u00e0y kh\u00f4ng ph\u1ed5 bi\u1ebfn do \u0111\u1ed9 m\u1ea1nh h\u1ea1n ch\u1ebf v\u00e0 chi ph\u00ed cao h\u01a1n. \u0110\u1ed1i v\u1edbi h\u1ea7u h\u1ebft c\u00e1c nhu c\u1ea7u t\u1eeb t\u00ednh, cobalt ph\u00f9 h\u1ee3p h\u01a1n khi l\u00e0 m\u1ed9t ph\u1ea7n c\u1ee7a h\u1ee3p kim thay v\u00ec d\u1ea1ng tinh khi\u1ebft.<\/p>\n<h2>Cobalt trong pin xe \u0111i\u1ec7n hi\u1ec7n \u0111\u1ea1i so v\u1edbi Cobalt trong nam ch\u00e2m \u2013 L\u00e0m r\u00f5 s\u1ef1 nh\u1ea7m l\u1eabn<\/h2>\n<p>\u0110i\u1ec1u quan tr\u1ecdng l\u00e0 l\u00e0m r\u00f5 m\u1ed9t s\u1ef1 nh\u1ea7m l\u1eabn ph\u1ed5 bi\u1ebfn: cobalt \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong nam ch\u00e2m v\u0129nh c\u1eedu l\u00e0 cobalt kim lo\u1ea1i, r\u1ea5t kh\u00e1c so v\u1edbi c\u00e1c h\u1ee3p ch\u1ea5t cobalt \u0111\u01b0\u1ee3c t\u00ecm th\u1ea5y trong pin lithium-ion (Li-ion) cho xe \u0111i\u1ec7n (EV). Trong nam ch\u00e2m, cobalt \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 cao v\u1ec1 \u0111\u1eb7c t\u00ednh t\u1eeb ferromagnetic, \u0111\u1eb7c bi\u1ec7t trong h\u1ee3p kim samarium-cobalt (SmCo). Trong khi \u0111\u00f3, pin xe \u0111i\u1ec7n ch\u1ee7 y\u1ebfu s\u1eed d\u1ee5ng cobalt \u1edf d\u1ea1ng h\u00f3a h\u1ecdc nh\u01b0 hydroxide cobalt ho\u1eb7c sulfate cobalt, \u0111\u00f3ng vai tr\u00f2 trong \u0111i\u1ec7n h\u00f3a c\u1ee7a pin nh\u01b0ng kh\u00f4ng th\u1ec3 hi\u1ec7n t\u00ednh t\u1eeb.<\/p>\n<p>M\u1eb7c d\u00f9 c\u00f3 nh\u1eefng kh\u00e1c bi\u1ec7t n\u00e0y, c\u1ea3 hai ng\u00e0nh \u0111\u1ec1u g\u1eb7p ph\u1ea3i nh\u1eefng th\u00e1ch th\u1ee9c v\u1ec1 \u1ed5n \u0111\u1ecbnh chu\u1ed7i cung \u1ee9ng v\u00e0 ngu\u1ed3n g\u1ed1c \u0111\u1ea1o \u0111\u1ee9c. Khai th\u00e1c cobalt m\u1ed9t c\u00e1ch c\u00f3 tr\u00e1ch nhi\u1ec7m l\u00e0 \u0111i\u1ec1u quan tr\u1ecdng d\u00f9 n\u00f3 c\u00f3 th\u1ec3 n\u1eb1m trong c\u00e1c nam ch\u00e2m hi\u1ec7u su\u1ea5t cao d\u00f9ng trong h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5 ho\u1eb7c trong pin cung c\u1ea5p n\u0103ng l\u01b0\u1ee3ng cho \u00f4 t\u00f4 \u0111i\u1ec7n. Hi\u1ec3u r\u00f5 s\u1ef1 ph\u00e2n bi\u1ec7t n\u00e0y gi\u00fap ng\u01b0\u1eddi ti\u00eau d\u00f9ng v\u00e0 nh\u00e0 s\u1ea3n xu\u1ea5t \u0111\u00e1nh gi\u00e1 \u0111\u00fang vai tr\u00f2 \u0111a d\u1ea1ng c\u1ee7a cobalt m\u00e0 kh\u00f4ng g\u00e2y nh\u1ea7m l\u1eabn.<\/p>\n<p>\u0110\u1ec3 bi\u1ebft th\u00eam v\u1ec1 vai tr\u00f2 c\u1ee7a cobalt trong nam ch\u00e2m v\u00e0 hi\u1ec7u su\u1ea5t c\u1ee7a ch\u00fang, h\u00e3y xem so s\u00e1nh chi ti\u1ebft gi\u1eefa nam ch\u00e2m samarium-cobalt v\u00e0 neodymium c\u1ee7a ch\u00fang t\u00f4i.<\/p>\n<h2>Nh\u1eefng hi\u1ec3u l\u1ea7m ph\u1ed5 bi\u1ebfn v\u00e0 c\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 t\u1eeb t\u00ednh c\u1ee7a cobalt<\/h2>\n<h3>Li\u1ec7u cobalt c\u00f3 t\u1eeb t\u00ednh h\u01a1n neodymium kh\u00f4ng?<\/h3>\n<p>Kh\u00f4ng ho\u00e0n to\u00e0n. Trong khi nam ch\u00e2m neodymium m\u1ea1nh h\u01a1n \u1edf nhi\u1ec7t \u0111\u1ed9 ph\u00f2ng, c\u00e1c nam ch\u00e2m d\u1ef1a tr\u00ean cobalt nh\u01b0 samarium-cobalt (SmCo) v\u01b0\u1ee3t tr\u1ed9i h\u01a1n neodymium khi n\u00f3i \u0111\u1ebfn <strong>kh\u00e1ng nhi\u1ec7t cao<\/strong>. T\u00ednh t\u1eeb c\u1ee7a cobalt v\u1eabn \u1ed5n \u0111\u1ecbnh ngay c\u1ea3 \u1edf nhi\u1ec7t \u0111\u1ed9 m\u00e0 nam ch\u00e2m neodymium m\u1ea5t \u0111i s\u1ee9c m\u1ea1nh.<\/p>\n<h3>Nam ch\u00e2m th\u00f4ng th\u01b0\u1eddng c\u00f3 h\u00fat cobalt kh\u00f4ng?<\/h3>\n<p>C\u00f3, cobalt t\u1ef1 nhi\u00ean <strong>s\u1eaft t\u1eeb<\/strong> v\u00e0 s\u1ebd b\u1ecb h\u00fat m\u1ea1nh b\u1edfi nam ch\u00e2m th\u00f4ng th\u01b0\u1eddng. B\u1ea1n c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng th\u1ea5y \u0111i\u1ec1u n\u00e0y v\u1edbi m\u1ed9t chi\u1ebfc nam ch\u00e2m t\u1ee7 l\u1ea1nh \u0111\u01a1n gi\u1ea3n.<\/p>\n<h3>Li\u1ec7u cobalt c\u00f3 t\u1eeb t\u00ednh m\u00e0 kh\u00f4ng c\u1ea7n b\u1ecb nam ch\u00e2m h\u00f3a kh\u00f4ng?<\/h3>\n<p>C\u00f3, cobalt t\u1ef1 b\u1ea3n ch\u1ea5t \u0111\u00e3 c\u00f3 t\u00ednh t\u1eeb nh\u1edd c\u1ea5u tr\u00fac nguy\u00ean t\u1eed c\u1ee7a n\u00f3 v\u00e0 <strong>electron 3d kh\u00f4ng gh\u00e9p c\u1eb7p<\/strong>. N\u00f3 c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng b\u1ecb nam ch\u00e2m h\u00f3a v\u0129nh vi\u1ec5n, \u0111\u00f3 l\u00e0 l\u00fd do t\u1ea1i sao cobalt l\u00e0 th\u00e0nh ph\u1ea7n ch\u00ednh trong c\u00e1c <strong>nam ch\u00e2m v\u0129nh c\u1eedu<\/strong>.<\/p>\n<p>N\u1ebfu b\u1ea1n t\u00f2 m\u00f2 v\u1ec1 \u1ea3nh h\u01b0\u1edfng c\u1ee7a nhi\u1ec7t \u0111\u1ed9 \u0111\u1ed1i v\u1edbi nam ch\u00e2m nh\u01b0 neodymium v\u00e0 cobalt, h\u00e3y xem h\u01b0\u1edbng d\u1eabn chi ti\u1ebft v\u1ec1 <a href=\"https:\/\/nbaem.com\/vi\/what-is-the-effect-of-heating-neodymium-magnets\/\" target=\"_blank\" rel=\"noopener\">\u1ea3nh h\u01b0\u1edfng c\u1ee7a vi\u1ec7c l\u00e0m n\u00f3ng nam ch\u00e2m neodymium<\/a>.<\/p>\n<p>&nbsp;<\/p>\n<h2>C\u00e1c \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf c\u1ee7a nam ch\u00e2m d\u1ef1a tr\u00ean cobalt ng\u00e0y nay (2025)<\/h2>\n<p>Nam ch\u00e2m d\u1ef1a tr\u00ean cobalt nh\u01b0 SmCo v\u1eabn gi\u1eef vai tr\u00f2 thi\u1ebft y\u1ebfu trong nhi\u1ec1u l\u0129nh v\u1ef1c ti\u00ean ti\u1ebfn nh\u1edd s\u1ef1 k\u1ebft h\u1ee3p \u0111\u1ed9c \u0111\u00e1o gi\u1eefa \u0111\u1ed9 b\u1ec1n v\u00e0 kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 n\u01a1i b\u1ea1n th\u01b0\u1eddng th\u1ea5y ch\u00fang:<\/p>\n<ul>\n<li><strong>H\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5 &amp; Qu\u1ed1c ph\u00f2ng:<\/strong> Nhi\u1ec7t \u0111\u1ed9 Curie cao v\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n c\u1ee7a ch\u00fang khi\u1ebfn ch\u00fang tr\u1edf th\u00e0nh l\u1ef1a ch\u1ecdn l\u00fd t\u01b0\u1edfng cho \u0111\u1ed9ng c\u01a1 ph\u1ea3n l\u1ef1c, h\u1ec7 th\u1ed1ng d\u1eabn \u0111\u01b0\u1eddng v\u00e0 thi\u1ebft b\u1ecb qu\u00e2n s\u1ef1, n\u01a1i \u0111\u1ed9 tin c\u1eady d\u01b0\u1edbi \u0111i\u1ec1u ki\u1ec7n kh\u1eafc nghi\u1ec7t l\u00e0 \u0111i\u1ec1u t\u1ed1i quan tr\u1ecdng.<\/li>\n<li><strong>Thi\u1ebft b\u1ecb y t\u1ebf (MRI):<\/strong> Nam ch\u00e2m SmCo cung c\u1ea5p tr\u01b0\u1eddng t\u1eeb \u1ed5n \u0111\u1ecbnh, m\u1ea1nh m\u1ebd c\u1ea7n thi\u1ebft trong m\u00e1y MRI, \u0111\u1ea3m b\u1ea3o ch\u1ea5t l\u01b0\u1ee3ng h\u00ecnh \u1ea3nh r\u00f5 n\u00e9t m\u00e0 kh\u00f4ng b\u1ecb suy gi\u1ea3m t\u1eeb t\u00ednh theo th\u1eddi gian.<\/li>\n<li><strong>\u0110\u1ed9ng c\u01a1 v\u00e0 m\u00e1y ph\u00e1t \u0111i\u1ec7n ch\u1ecbu nhi\u1ec7t cao:<\/strong> Nh\u1eefng nam ch\u00e2m n\u00e0y ho\u1ea1t \u0111\u1ed9ng \u0111\u00e1ng tin c\u1eady trong c\u00e1c \u0111\u1ed9ng c\u01a1 v\u00e0 m\u00e1y ph\u00e1t \u0111i\u1ec7n ch\u1ecbu nhi\u1ec7t cao, ch\u1eb3ng h\u1ea1n nh\u01b0 trong xe \u0111i\u1ec7n ho\u1eb7c thi\u1ebft b\u1ecb c\u00f4ng nghi\u1ec7p.<\/li>\n<li><strong>D\u1ee5ng c\u1ee5 khoan d\u1ea7u kh\u00ed:<\/strong> M\u00f4i tr\u01b0\u1eddng kh\u1eafc nghi\u1ec7t s\u00e2u d\u01b0\u1edbi l\u00f2ng \u0111\u1ea5t \u0111\u00f2i h\u1ecfi nam ch\u00e2m c\u00f3 th\u1ec3 ch\u1ecbu nhi\u1ec7t \u0111\u1ed9 cao v\u00e0 \u0103n m\u00f2n \u2014 nam ch\u00e2m d\u1ef1a tr\u00ean cobalt ph\u00f9 h\u1ee3p ho\u00e0n h\u1ea3o.<\/li>\n<\/ul>\n<p>S\u1ef1 \u0111a d\u1ea1ng th\u1ef1c t\u1ebf n\u00e0y l\u00e0 l\u00fd do t\u1ea1i sao nam ch\u00e2m cobalt v\u1eabn gi\u1eef v\u1ecb tr\u00ed v\u1eefng ch\u1eafc m\u1eb7c d\u00f9 c\u00f3 c\u00e1c v\u1eadt li\u1ec7u m\u1edbi xu\u1ea5t hi\u1ec7n.<\/p>\n<h2>Xu h\u01b0\u1edbng t\u01b0\u01a1ng lai: Ch\u00fang ta c\u00f3 c\u00f2n c\u1ea7n cobalt trong nam ch\u00e2m kh\u00f4ng?<\/h2>\n<p>T\u01b0\u01a1ng lai c\u1ee7a cobalt trong nam ch\u00e2m l\u00e0 ch\u1ee7 \u0111\u1ec1 n\u00f3ng b\u1ecfng khi c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u c\u1ed1 g\u1eafng gi\u1ea3m ho\u1eb7c th\u1eadm ch\u00ed lo\u1ea1i b\u1ecf vi\u1ec7c s\u1eed d\u1ee5ng cobalt trong nam ch\u00e2m \u0111\u1ea5t hi\u1ebfm. \u0110i\u1ec1u n\u00e0y ch\u1ee7 y\u1ebfu do chi ph\u00ed c\u1ee7a kim lo\u1ea1i n\u00e0y v\u00e0 c\u00e1c v\u1ea5n \u0111\u1ec1 v\u1ec1 ngu\u1ed3n cung \u0111\u1ea1o \u0111\u1ee9c. C\u00e1c v\u1eadt li\u1ec7u m\u1edbi \u00edt ho\u1eb7c kh\u00f4ng ch\u1ee9a cobalt \u0111ang xu\u1ea5t hi\u1ec7n, nh\u1eb1m m\u1ee5c ti\u00eau ph\u00f9 h\u1ee3p ho\u1eb7c v\u01b0\u1ee3t qua hi\u1ec7u su\u1ea5t t\u1eeb c\u1ee7a nam ch\u00e2m d\u1ef1a tr\u00ean cobalt truy\u1ec1n th\u1ed1ng.<\/p>\n<p>Tuy nhi\u00ean, th\u1ef1c t\u1ebf ng\u00e0y nay l\u00e0 nam ch\u00e2m samarium-cobalt (SmCo) v\u1eabn kh\u00f4ng th\u1ec3 thay th\u1ebf trong c\u00e1c \u1ee9ng d\u1ee5ng \u0111\u00f2i h\u1ecfi cao. Kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t v\u00e0 \u1ed5n \u0111\u1ecbnh v\u01b0\u1ee3t tr\u1ed9i c\u1ee7a ch\u00fang gi\u1eef cho ch\u00fang \u0111\u1ee9ng \u0111\u1ea7u trong c\u00e1c ng\u00e0nh h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5, qu\u1ed1c ph\u00f2ng v\u00e0 c\u00e1c ng\u00e0nh c\u00f4ng nghi\u1ec7p kh\u00e1c n\u01a1i \u0111\u1ed9 tin c\u1eady d\u01b0\u1edbi \u0111i\u1ec1u ki\u1ec7n kh\u1eafc nghi\u1ec7t l\u00e0 b\u1eaft bu\u1ed9c.<\/p>\n<p>Trong khi th\u1ecb tr\u01b0\u1eddng nam ch\u00e2m ph\u00e1t tri\u1ec3n, c\u00e1c \u0111\u1eb7c t\u00ednh t\u1eeb v\u00e0 kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t \u0111\u1eb7c bi\u1ec7t c\u1ee7a cobalt \u0111\u1ea3m b\u1ea3o n\u00f3 v\u1eabn \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng\u2014\u0111\u1eb7c bi\u1ec7t trong c\u00e1c l\u0129nh v\u1ef1c m\u00e0 c\u00e1c l\u1ef1a ch\u1ecdn thay th\u1ebf ch\u01b0a th\u1ec3 c\u1ea1nh tranh. \u0110\u1ec3 c\u00f3 c\u00e1i nh\u00ecn s\u00e2u h\u01a1n v\u1ec1 c\u00e1c \u1ee9ng d\u1ee5ng c\u1ee7a nam ch\u00e2m v\u0129nh c\u1eedu, bao g\u1ed3m vai tr\u00f2 c\u1ee7a nam ch\u00e2m ch\u1ecbu nhi\u1ec7t cao, h\u00e3y xem qua t\u1ed5ng quan chi ti\u1ebft n\u00e0y v\u1ec1 <a href=\"https:\/\/nbaem.com\/vi\/new-applications-of-permanent-magnets\/\" target=\"_blank\" rel=\"noopener\">\u1ee9ng d\u1ee5ng m\u1edbi c\u1ee7a nam ch\u00e2m v\u0129nh c\u1eedu<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>Yes cobalt is strongly ferromagnetic with the highest Curie temperature discover its magnetic strength and uses in high temperature magnets.<\/p>","protected":false},"author":1,"featured_media":3452,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_mi_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3453","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"jetpack_featured_media_url":"https:\/\/nbaem.com\/wp-content\/uploads\/2025\/11\/Is_cobalt_magnetic_O6cqcnx2r.webp","_links":{"self":[{"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/3453","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/comments?post=3453"}],"version-history":[{"count":2,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/3453\/revisions"}],"predecessor-version":[{"id":3464,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/3453\/revisions\/3464"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/media\/3452"}],"wp:attachment":[{"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/media?parent=3453"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/categories?post=3453"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/tags?post=3453"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}