{"id":1406,"date":"2024-11-26T03:26:23","date_gmt":"2024-11-26T03:26:23","guid":{"rendered":"https:\/\/nbaem.com\/?p=1406"},"modified":"2024-11-27T05:13:41","modified_gmt":"2024-11-27T05:13:41","slug":"magnetic-anisotropy","status":"publish","type":"post","link":"https:\/\/nbaem.com\/vi\/magnetic-anisotropy\/","title":{"rendered":"L\u00e0 g\u00ec v\u1ec1 \u0110\u1ecbnh h\u01b0\u1edbng D\u1ecb h\u01b0\u1edbng t\u1eeb t\u00ednh"},"content":{"rendered":"

\u0110\u1ecbnh h\u01b0\u1edbng t\u1eeb t\u00ednh c\u00f3 ngh\u0129a l\u00e0 m\u1ed9t v\u1eadt li\u1ec7u c\u00f3 h\u01b0\u1edbng \u01b0u ti\u00ean cho c\u00e1c moment t\u1eeb c\u1ee7a n\u00f3 khi b\u1ea1n \u00e1p d\u1ee5ng m\u1ed9t tr\u01b0\u1eddng t\u1eeb l\u00ean n\u00f3. N\u00f3i \u0111\u01a1n gi\u1ea3n h\u01a1n, \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 c\u00e1ch v\u1eadt li\u1ec7u \u0111\u01b0\u1ee3c h\u01b0\u1edbng v\u1ec1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1ch n\u00f3 ph\u1ea3n \u1ee9ng t\u1eeb. M\u1ed9t s\u1ed1 v\u1eadt li\u1ec7u mu\u1ed1n \u0111\u01b0\u1ee3c t\u1eeb h\u00f3a nhi\u1ec1u h\u01a1n theo m\u1ed9t h\u01b0\u1edbng nh\u1ea5t \u0111\u1ecbnh. Ch\u00fang t\u00f4i g\u1ecdi \u0111\u00f3 l\u00e0 tr\u1ee5c \u201cd\u1ec5\u201d. Ch\u00fang kh\u00f4ng mu\u1ed1n b\u1ecb t\u1eeb h\u00f3a theo c\u00e1c h\u01b0\u1edbng kh\u00e1c.<\/p>\n

Nguy\u00ean nh\u00e2n c\u1ee7a \u0110\u1ecbnh h\u01b0\u1edbng T\u1eeb t\u00ednh<\/strong><\/span><\/h2>\n

C\u00f3 m\u1ed9t v\u00e0i y\u1ebfu t\u1ed1 g\u00e2y ra \u0111\u1ecbnh h\u01b0\u1edbng t\u1eeb t\u00ednh.<\/p>\n

    \n
  1. C\u1ea5u tr\u00fac tinh th\u1ec3: <\/strong>\u0110\u1ed9 \u0111\u1ed1i x\u1ee9ng c\u1ee7a m\u1ea1ng tinh th\u1ec3 c\u1ee7a m\u1ed9t v\u1eadt li\u1ec7u c\u00f3 th\u1ec3 t\u1ea1o ra m\u1ed9t tr\u1ee5c d\u1ec5. V\u1eadt li\u1ec7u l\u1eadp ph\u01b0\u01a1ng th\u01b0\u1eddng mu\u1ed1n h\u01b0\u1edbng t\u1eeb c\u1ee7a ch\u00fang d\u1ecdc theo \u0111\u01b0\u1eddng ch\u00e9o c\u1ee7a kh\u1ed1i. V\u1eadt li\u1ec7u kh\u00f4ng l\u1eadp ph\u01b0\u01a1ng mu\u1ed1n h\u01b0\u1edbng t\u1eeb c\u1ee7a ch\u00fang d\u1ecdc theo c\u00e1c tr\u1ee5c tinh th\u1ec3 nh\u1ea5t \u0111\u1ecbnh. Ch\u00fang t\u00f4i g\u1ecdi \u0111\u00f3 l\u00e0 \u0111\u1ecbnh h\u01b0\u1edbng tinh th\u1ec3 t\u1eeb. \u0110\u00e2y l\u00e0 nguy\u00ean nh\u00e2n n\u1ed9i t\u1ea1i duy nh\u1ea5t c\u1ee7a \u0111\u1ecbnh h\u01b0\u1edbng v\u00ec n\u00f3 xu\u1ea5t ph\u00e1t t\u1eeb c\u1ea5u tr\u00fac c\u1ee7a v\u1eadt li\u1ec7u.<\/li>\n
  2. \u0110\u1ecbnh h\u01b0\u1edbng h\u00ecnh d\u1ea1ng:<\/strong> Khi b\u1ea1n c\u00f3 c\u00e1c v\u1eadt th\u1ec3 kh\u00f4ng h\u00ecnh c\u1ea7u nh\u01b0 m\u00e0ng m\u1ecfng ho\u1eb7c c\u00e1c h\u1ea1t nh\u1ecf, b\u1ea1n c\u00f3 th\u1ec3 g\u1eb7p ph\u1ea3i \u0111\u1ecbnh h\u01b0\u1edbng do c\u00e1c hi\u1ec7u \u1ee9ng b\u1ec1 m\u1eb7t ho\u1eb7c c\u1ea1nh. H\u00ecnh d\u1ea1ng c\u1ee7a v\u1eadt li\u1ec7u \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1ch n\u00f3 ph\u1ea3n \u1ee9ng v\u1edbi tr\u01b0\u1eddng t\u1eeb b\u00ean ngo\u00e0i. C\u00e1c tr\u01b0\u1eddng kh\u1eed t\u1eeb kh\u00e1c nhau t\u00f9y thu\u1ed9c v\u00e0o h\u01b0\u1edbng \u0111o \u0111\u1ea1c.<\/li>\n
  3. Li\u00ean k\u1ebft Spin-Orbit: <\/strong>T\u01b0\u01a1ng t\u00e1c gi\u1eefa spin c\u1ee7a electron v\u00e0 chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a electron quanh h\u1ea1t nh\u00e2n c\u00f3 th\u1ec3 khi\u1ebfn h\u01b0\u1edbng t\u1eeb mu\u1ed1n ch\u1ec9 v\u1ec1 m\u1ed9t h\u01b0\u1edbng nh\u1ea5t \u0111\u1ecbnh.<\/li>\n
  4. \u0110\u1ecbnh h\u01b0\u1edbng t\u1eeb t\u00ednh \u0111i\u1ec7n t\u1eeb:<\/strong> N\u1ebfu b\u1ea1n \u0111\u1eb7t m\u1ed9t \u1ee9ng su\u1ea5t ho\u1eb7c l\u1ef1c k\u00e9o c\u01a1 h\u1ecdc l\u00ean v\u1eadt li\u1ec7u, b\u1ea1n c\u00f3 th\u1ec3 thay \u0111\u1ed5i c\u00e1ch n\u00f3 ph\u1ea3n \u1ee9ng t\u1eeb.<\/li>\n
  5. \u0110\u1ecbnh h\u01b0\u1edbng trao \u0111\u1ed5i:<\/strong>\u0110i\u1ec1u n\u00e0y li\u00ean quan \u0111\u1ebfn c\u00e1c t\u01b0\u01a1ng t\u00e1c gi\u1eefa c\u00e1c moment t\u1eeb trong v\u1eadt li\u1ec7u. Khi b\u1ea1n c\u00f3 c\u00e1c v\u1eadt li\u1ec7u ferromagnetic v\u00e0 antiferromagnetic k\u1ebft h\u1ee3p v\u1edbi nhau, l\u1edbp antiferromagnetic c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1ch h\u01b0\u1edbng t\u1eeb ph\u1ea3n \u1ee9ng trong l\u1edbp ferromagnetic.<\/li>\n
  6. Doping v\u00e0 t\u1ea1p ch\u1ea5t:<\/strong> B\u1ea1n c\u00f3 th\u1ec3 c\u1ed1 \u00fd \u0111\u01b0a t\u1ea1p ch\u1ea5t ho\u1eb7c khuy\u1ebft t\u1eadt v\u00e0o v\u1eadt li\u1ec7u \u0111\u1ec3 thay \u0111\u1ed5i c\u1ea5u tr\u00fac \u0111i\u1ec7n t\u1eed c\u1ee7a n\u00f3, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1ch n\u00f3 ph\u1ea3n \u1ee9ng t\u1eeb v\u00e0 \u0111\u1ecbnh h\u01b0\u1edbng c\u1ee7a n\u00f3.<\/li>\n
  7. \u1ee8ng su\u1ea5t:<\/strong> Khi b\u1ea1n bi\u1ebfn d\u1ea1ng c\u01a1 h\u1ecdc m\u1ed9t v\u1eadt li\u1ec7u, b\u1ea1n l\u00e0m bi\u1ebfn d\u1ea1ng c\u1ea5u tr\u00fac tinh th\u1ec3 c\u1ee7a n\u00f3. S\u1ef1 bi\u1ebfn d\u1ea1ng n\u00e0y c\u00f3 th\u1ec3 thay \u0111\u1ed5i v\u1ecb tr\u00ed c\u1ee7a tr\u1ee5c d\u1ec5 v\u00e0 c\u00e1ch n\u00f3 ph\u1ea3n \u1ee9ng t\u1eeb.<\/li>\n<\/ol>\n

     <\/p>\n

    C\u00e1c lo\u1ea1i \u0111\u1ecbnh h\u01b0\u1edbng t\u1eeb t\u00ednh<\/strong><\/span><\/h2>\n

    C\u00f3 m\u1ed9t v\u00e0i lo\u1ea1i \u0111\u1ecbnh h\u01b0\u1edbng t\u1eeb t\u00ednh kh\u00e1c nhau.<\/p>\n

      \n
    1. \u0110\u1ecbnh h\u01b0\u1edbng tinh th\u1ec3:<\/strong>\u0111\u00e2y l\u00e0 l\u00fac \u0111\u1ed1i x\u1ee9ng tinh th\u1ec3 c\u1ee7a v\u1eadt li\u1ec7u x\u00e1c \u0111\u1ecbnh h\u01b0\u1edbng tr\u1ee5c d\u1ec5 c\u1ee7a n\u00f3. B\u1ea1n c\u00f3 th\u1ec3 th\u1ea5y \u0111i\u1ec1u n\u00e0y \u1edf c\u00e1c v\u1eadt li\u1ec7u l\u1eadp ph\u01b0\u01a1ng v\u00e0 kh\u00f4ng l\u1eadp ph\u01b0\u01a1ng.<\/li>\n
    2. \u0110\u1ecbnh h\u01b0\u1edbng h\u00ecnh d\u1ea1ng:<\/strong> \u0111\u00e2y l\u00e0 l\u00fac h\u00ecnh d\u1ea1ng c\u1ee7a v\u1eadt li\u1ec7u x\u00e1c \u0111\u1ecbnh h\u01b0\u1edbng tr\u1ee5c d\u1ec5 c\u1ee7a n\u00f3. B\u1ea1n th\u1ea5y \u0111i\u1ec1u n\u00e0y trong c\u00e1c l\u1edbp m\u1ecfng v\u00e0 h\u1ea1t nano.<\/li>\n
    3. \u1ee8ng su\u1ea5t t\u1eeb:<\/strong> \u0111\u00e2y l\u00e0 l\u00fac t\u1eeb t\u00ednh c\u1ee7a v\u1eadt li\u1ec7u t\u01b0\u01a1ng t\u00e1c v\u1edbi c\u1ea5u tr\u00fac m\u1ea1ng tinh th\u1ec3, v\u00e0 v\u1eadt li\u1ec7u m\u1edf r\u1ed9ng ho\u1eb7c co l\u1ea1i khi b\u1ea1n \u00e1p d\u1ee5ng t\u1eeb tr\u01b0\u1eddng l\u00ean n\u00f3.<\/li>\n
    4. \u0110\u1eb7c t\u00ednh d\u1ecb h\u01b0\u1edbng t\u1eeb tr\u01b0\u1eddng: \u0110\u00e2y l\u00e0 khi v\u1eadt li\u1ec7u c\u00f3 \u0111\u1ed9 nh\u1ea1y t\u1eeb cao, v\u00e0 t\u1eeb tr\u01b0\u1eddng b\u00ean ngo\u00e0i t\u01b0\u01a1ng t\u00e1c v\u1edbi c\u00e1c m\u00f4 men t\u1eeb trong v\u1eadt li\u1ec7u kh\u00e1c nhau t\u00f9y thu\u1ed9c v\u00e0o h\u01b0\u1edbng c\u1ee7a tr\u01b0\u1eddng.<\/li>\n<\/ol>\n

      <\/h2>\n

      D\u1ecb h\u01b0\u1edbng trong v\u1eadt li\u1ec7u t\u1eeb c\u1ee9ng v\u00e0 m\u1ec1m<\/strong><\/span><\/h2>\n

      V\u1eadt li\u1ec7u t\u1eeb c\u1ee9ng: <\/strong>Nh\u1eefng v\u1eadt li\u1ec7u n\u00e0y, ch\u1eb3ng h\u1ea1n nh\u01b0 nam ch\u00e2m neodymium<\/span><\/a>, c\u00f3 \u0111\u1ed9 d\u1ecb h\u01b0\u1edbng t\u1eeb cao, v\u00ec v\u1eady ch\u00fang ch\u1ed1ng l\u1ea1i s\u1ef1 m\u1ea5t t\u1eeb t\u00ednh. Ch\u00fang t\u00f4i s\u1eed d\u1ee5ng c\u00e1c \u0111\u1eb7c t\u00ednh t\u1eeb m\u1ea1nh, theo h\u01b0\u1edbng trong c\u00e1c \u1ee9ng d\u1ee5ng nh\u01b0 \u0111\u1ed9ng c\u01a1 v\u00e0 m\u00e1y ph\u00e1t \u0111i\u1ec7n.<\/p>\n

      V\u1eadt li\u1ec7u t\u1eeb m\u1ec1m:<\/strong> \u00cdt ph\u1ed5 bi\u1ebfn h\u01a1n, c\u00e1c v\u1eadt li\u1ec7u t\u1eeb m\u1ec1m c\u0169ng c\u00f3 th\u1ec3 b\u1ecb d\u1ecb h\u01b0\u1edbng do c\u00e1c y\u1ebfu t\u1ed1 c\u1ea5u tr\u00fac n\u1ed9i b\u1ed9 ho\u1eb7c ph\u01b0\u01a1ng ph\u00e1p x\u1eed l\u00fd b\u00ean ngo\u00e0i. V\u00ed d\u1ee5 bao g\u1ed3m th\u00e9p \u0111i\u1ec7n h\u01b0\u1edbng h\u1ea1t d\u00f9ng trong bi\u1ebfn th\u1ebf.<\/p>\n

      \u00a0<\/strong><\/p>\n

      \u0110\u1ea1t \u0111\u01b0\u1ee3c D\u1ecb h\u01b0\u1edbng T\u1eeb t\u1ed1t h\u01a1n<\/strong><\/span><\/h2>\n

      C\u00e1c nh\u00e0 s\u1ea3n xu\u1ea5t c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n d\u1ecb h\u01b0\u1edbng t\u1eeb b\u1eb1ng c\u00e1ch ki\u1ec3m so\u00e1t c\u1ea9n th\u1eadn m\u1ed9t s\u1ed1 y\u1ebfu t\u1ed1 trong qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t:<\/p>\n

      L\u1ef1a ch\u1ecdn v\u1eadt li\u1ec7u: <\/strong>Vi\u1ec7c ch\u1ecdn v\u1eadt li\u1ec7u n\u1ec1n, nh\u01b0 neodymium trong c\u00e1c nam ch\u00e2m hi\u1ec7u su\u1ea5t cao, l\u00e0 ch\u00eca kh\u00f3a \u0111\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c c\u00e1c \u0111\u1eb7c t\u00ednh t\u1eeb m\u1ea1nh.<\/p>\n

      K\u1ef9 thu\u1eadt \u0111\u1ecbnh h\u01b0\u1edbng v\u00e0 x\u1eed l\u00fd: <\/strong>Khi ch\u00fang t\u00f4i t\u1ea1o ra nam ch\u00e2m, ch\u00fang t\u00f4i c\u0103n ch\u1ec9nh c\u00e1c m\u00f4 men t\u1eeb b\u1eb1ng c\u00e1c quy tr\u00ecnh nh\u01b0 \u00e9p n\u00f3ng ho\u1eb7c \u00e9p \u0111\u1ed3ng nh\u1ea5t. \u0110i\u1ec1u n\u00e0y gi\u00fap ch\u00fang t\u00f4i t\u1ea1o ra c\u00e1c nam ch\u00e2m c\u00f3 \u0111\u1eb7c t\u00ednh d\u1ecb h\u01b0\u1edbng t\u1ed1t h\u01a1n.<\/p>\n

      K\u00edch th\u01b0\u1edbc v\u00e0 h\u00ecnh d\u1ea1ng h\u1ea1t: <\/strong>Ch\u00fang t\u00f4i ki\u1ec3m so\u00e1t t\u1ed1t k\u00edch th\u01b0\u1edbc v\u00e0 h\u00ecnh d\u1ea1ng h\u1ea1t c\u1ee7a v\u1eadt li\u1ec7u \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o n\u00f3 c\u00f3 c\u00e1c \u0111\u1eb7c t\u00ednh t\u1eeb nh\u1ea5t qu\u00e1n.<\/p>\n

      N\u1ed9i dung oxy: <\/strong>Ch\u00fang t\u00f4i gi\u1ea3m l\u01b0\u1ee3ng oxy trong qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t \u0111\u1ec3 l\u00e0m cho v\u1eadt li\u1ec7u ch\u1ea3y t\u1ed1t h\u01a1n v\u00e0 gi\u1eef \u0111\u01b0\u1ee3c t\u00ednh ch\u1ea5t d\u1ecb h\u01b0\u1edbng.<\/p>\n

      \u00c9p vu\u00f4ng g\u00f3c d\u01b0\u1edbi t\u00e1c d\u1ee5ng c\u1ee7a t\u1eeb tr\u01b0\u1eddng:<\/strong> Ch\u00fang t\u00f4i c\u0103n ch\u1ec9nh c\u00e1c h\u01b0\u1edbng t\u1eeb khi \u00e9p v\u1eadt li\u1ec7u trong qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t. \u0110\u00f3 l\u00e0 c\u00e1ch ch\u00fang t\u00f4i t\u1ea1o ra t\u00ednh ch\u1ea5t d\u1ecb h\u01b0\u1edbng trong s\u1ea3n ph\u1ea9m cu\u1ed1i c\u00f9ng.<\/p>\n

      \u00a0<\/strong><\/p>\n

      Nam ch\u00e2m d\u1ecb h\u01b0\u1edbng so v\u1edbi nam ch\u00e2m \u0111a h\u01b0\u1edbng<\/strong><\/span><\/h2>\n

      Nam ch\u00e2m d\u1ecb h\u01b0\u1edbng: <\/strong>Nh\u1eefng nam ch\u00e2m n\u00e0y c\u00f3 \u0111\u1eb7c t\u00ednh t\u1eeb tr\u01b0\u1eddng ph\u1ee5 thu\u1ed9c v\u00e0o h\u01b0\u1edbng. V\u00ed d\u1ee5, ch\u00fang t\u00f4i l\u00e0m nam ch\u00e2m neodymium nung k\u1ebft c\u00f3 c\u00e1c h\u1ea1t \u0111\u01b0\u1ee3c x\u1ebfp h\u00e0ng trong qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t. \u0110i\u1ec1u n\u00e0y gi\u00fap ch\u00fang c\u00f3 hi\u1ec7u su\u1ea5t t\u1eeb m\u1ea1nh m\u1ebd trong m\u1ed9t h\u01b0\u1edbng \u01b0u ti\u00ean.<\/p>\n

      Nam ch\u00e2m \u0111a h\u01b0\u1edbng:<\/strong> Ng\u01b0\u1ee3c l\u1ea1i, nam ch\u00e2m \u0111a h\u01b0\u1edbng nh\u01b0 nam ch\u00e2m neodymium li\u00ean k\u1ebft kh\u00f4ng c\u00f3 h\u01b0\u1edbng \u01b0u ti\u00ean cho t\u1eeb h\u00f3a. Ch\u00fang c\u00f3 \u0111\u1eb7c t\u00ednh t\u1eeb tr\u01b0\u1eddng t\u01b0\u01a1ng t\u1ef1 \u1edf t\u1ea5t c\u1ea3 c\u00e1c h\u01b0\u1edbng. \u0110i\u1ec1u n\u00e0y cho ph\u00e9p b\u1ea1n \u0111\u1ecbnh h\u00ecnh v\u00e0 t\u1eeb h\u00f3a ch\u00fang theo c\u00e1c h\u01b0\u1edbng kh\u00e1c nhau. Th\u01b0\u1eddng th\u00ec ch\u00fang y\u1ebfu h\u01a1n nam ch\u00e2m d\u1ecb h\u01b0\u1edbng.<\/p>\n

       <\/p>\n

      \u1ee8ng d\u1ee5ng c\u1ee7a nam ch\u00e2m d\u1ecb h\u01b0\u1edbng<\/strong><\/span><\/h2>\n

      Nam ch\u00e2m d\u1ecb h\u01b0\u1edbng c\u00f3 nhi\u1ec1u \u1ee9ng d\u1ee5ng trong c\u00e1c ng\u00e0nh c\u00f4ng nghi\u1ec7p kh\u00e1c nhau v\u00ec ch\u00fang c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 t\u1eeb m\u1ea1nh h\u01a1n v\u00e0 t\u00ednh h\u01b0\u1edbng r\u00f5 r\u00e0ng h\u01a1n. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 v\u00ed d\u1ee5:<\/p>\n

        \n
      1. C\u1ea3m bi\u1ebfn: <\/strong>Ch\u00fang t\u00f4i s\u1eed d\u1ee5ng nam ch\u00e2m d\u1ecb h\u01b0\u1edbng, nh\u01b0 nam ch\u00e2m samarium cobalt, trong c\u1ea3m bi\u1ebfn chuy\u1ec3n \u0111\u1ed5i t\u1eeb tr\u01b0\u1eddng th\u00e0nh t\u00edn hi\u1ec7u \u0111i\u1ec7n. B\u1ea1n s\u1ebd th\u1ea5y c\u00e1c c\u1ea3m bi\u1ebfn n\u00e0y trong h\u1ec7 th\u1ed1ng \u00f4 t\u00f4 v\u00e0 h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5.<\/li>\n
      2. M\u00e1y ph\u00e1t \u0111i\u1ec7n: <\/strong>Ch\u00fang t\u00f4i s\u1eed d\u1ee5ng tr\u01b0\u1eddng t\u1eeb t\u1ea1o ra b\u1edfi nam ch\u00e2m d\u1ecb h\u01b0\u1edbng \u0111\u1ec3 ch\u1ebf t\u1ea1o m\u00e1y ph\u00e1t \u0111i\u1ec7n. V\u00ed d\u1ee5, c\u00e1c nam ch\u00e2m trong turbine gi\u00f3 l\u00e0 nam ch\u00e2m d\u1ecb h\u01b0\u1edbng.<\/li>\n
      3. L\u00e0m l\u1ea1nh:<\/strong> Ng\u01b0\u1eddi ta \u0111ang nghi\u00ean c\u1ee9u s\u1eed d\u1ee5ng nam ch\u00e2m trong c\u00f4ng ngh\u1ec7 l\u00e0m l\u1ea1nh. V\u00ed d\u1ee5, MIT \u0111ang nghi\u00ean c\u1ee9u s\u1eed d\u1ee5ng nam ch\u00e2m nh\u01b0 m\u1ed9t ch\u1ea5t l\u00e0m l\u1ea1nh ti\u1ec1m n\u0103ng.<\/li>\n
      4. C\u1ed9ng h\u01b0\u1edfng t\u1eeb h\u1ea1t nh\u00e2n (NMR): <\/strong>Ch\u00fang t\u00f4i s\u1eed d\u1ee5ng nam ch\u00e2m d\u1ecb h\u01b0\u1edbng \u0111\u1ec3 ch\u1ebf t\u1ea1o m\u00e1y quang ph\u1ed5 NMR. Nh\u1eefng thi\u1ebft b\u1ecb n\u00e0y gi\u00fap ch\u00fang t\u00f4i nghi\u00ean c\u1ee9u c\u00e1c \u0111\u1eb7c t\u00ednh v\u1eadt l\u00fd v\u00e0 h\u00f3a h\u1ecdc c\u1ee7a v\u1eadt li\u1ec7u.<\/li>\n
      5. \u1ee8ng d\u1ee5ng y t\u1ebf: <\/strong>Nam ch\u00e2m d\u1ecb h\u01b0\u1edbng \u1ed5n \u0111\u1ecbnh \u1edf nhi\u1ec7t \u0111\u1ed9 cao, v\u00ec v\u1eady ch\u00fang t\u00f4i s\u1eed d\u1ee5ng ch\u00fang trong c\u00e1c thi\u1ebft b\u1ecb y t\u1ebf ti\u1ec7t tr\u00f9ng v\u00e0 c\u1ea5y gh\u00e9p.<\/li>\n<\/ol>\n

        Hi\u1ec3u v\u1ec1 \u0111\u1ed9 d\u1ecb h\u01b0\u1edbng t\u1eeb tr\u01b0\u1eddng gi\u00fap b\u1ea1n s\u1eed d\u1ee5ng nam ch\u00e2m m\u1ed9t c\u00e1ch t\u1ed1i \u01b0u trong \u1ee9ng d\u1ee5ng c\u1ee7a m\u00ecnh. Nam ch\u00e2m d\u1ecb h\u01b0\u1edbng c\u00f3 h\u01b0\u1edbng ri\u00eang, \u0111i\u1ec1u n\u00e0y r\u1ea5t quan tr\u1ecdng. \u0110\u00f3 l\u00e0 l\u00fd do t\u1ea1i sao ch\u00fang \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong nhi\u1ec1u ng\u00e0nh c\u00f4ng nghi\u1ec7p kh\u00e1c nhau, t\u1eeb n\u0103ng l\u01b0\u1ee3ng \u0111\u1ebfn ch\u0103m s\u00f3c s\u1ee9c kh\u1ecfe. Nam ch\u00e2m isotropic mang l\u1ea1i s\u1ef1 linh ho\u1ea1t h\u01a1n trong thi\u1ebft k\u1ebf nh\u01b0ng kh\u00f4ng m\u1ea1nh b\u1eb1ng. N\u1ebfu b\u1ea1n mu\u1ed1n t\u00ecm hi\u1ec3u th\u00eam v\u1ec1 v\u1eadt li\u1ec7u t\u1eeb v\u00e0 c\u00e1ch ch\u00fang c\u00f3 th\u1ec3 gi\u00fap b\u1ea1n, h\u00e3y li\u00ean h\u1ec7 v\u1edbi ch\u00fang t\u00f4i b\u1ea5t c\u1ee9 l\u00fac n\u00e0o.<\/p>\n

        \"\u0110\u1ed9

        \u0110\u1ed9 d\u1ecb h\u01b0\u1edbng t\u1eeb tr\u01b0\u1eddng. Ngu\u1ed3n h\u00ecnh \u1ea3nh: Wikipedia<\/span><\/p><\/div>","protected":false},"excerpt":{"rendered":"

        Anisotropy t\u1eeb tr\u01b0\u1eddng ngh\u0129a l\u00e0 m\u1ed9t v\u1eadt li\u1ec7u c\u00f3 h\u01b0\u1edbng \u01b0u ti\u00ean cho c\u00e1c h\u01b0\u1edbng t\u1eeb c\u1ee7a n\u00f3 khi b\u1ea1n \u00e1p d\u1ee5ng t\u1eeb tr\u01b0\u1eddng v\u00e0o. N\u00f3i m\u1ed9t c\u00e1ch \u0111\u01a1n gi\u1ea3n h\u01a1n, \u0111i\u1ec1u \u0111\u00f3 c\u00f3 ngh\u0129a l\u00e0 c\u00e1ch v\u1eadt li\u1ec7u h\u01b0\u1edbng v\u1ec1 ph\u00eda n\u00e0o \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1ch n\u00f3 ph\u1ea3n \u1ee9ng t\u1eeb t\u00ednh. M\u1ed9t s\u1ed1 v\u1eadt li\u1ec7u mu\u1ed1n \u0111\u01b0\u1ee3c t\u1eeb h\u00f3a nhi\u1ec1u h\u01a1n theo m\u1ed9t h\u01b0\u1edbng nh\u1ea5t \u0111\u1ecbnh h\u01a1n...<\/p>","protected":false},"author":1,"featured_media":1405,"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-1406","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"jetpack_featured_media_url":"https:\/\/nbaem.com\/wp-content\/uploads\/2024\/11\/Xnip2024-11-26_11-01-55.jpg","_links":{"self":[{"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/1406","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=1406"}],"version-history":[{"count":3,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/1406\/revisions"}],"predecessor-version":[{"id":1414,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/posts\/1406\/revisions\/1414"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/media\/1405"}],"wp:attachment":[{"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/media?parent=1406"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/categories?post=1406"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nbaem.com\/vi\/wp-json\/wp\/v2\/tags?post=1406"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}