{"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\/cs\/magnetic-anisotropy\/","title":{"rendered":"Co je magnetick\u00e1 anizotropie"},"content":{"rendered":"

Magnetick\u00e1 anizotropie znamen\u00e1, \u017ee materi\u00e1l m\u00e1 preferovanou sm\u011br pro sv\u00e9 magnetick\u00e9 momenty, kdy\u017e na n\u011bj p\u016fsob\u00edte magnetick\u00fdm polem. Jednodu\u0161e \u0159e\u010deno, znamen\u00e1 to, \u017ee zp\u016fsob, jak\u00fdm je materi\u00e1l orientov\u00e1n, ovliv\u0148uje jeho magnetick\u00e9 chov\u00e1n\u00ed. N\u011bkter\u00e9 materi\u00e1ly se cht\u011bj\u00ed v\u00edce magnetizovat v jednom sm\u011bru ne\u017e v jin\u00fdch. Tento sm\u011br naz\u00fdv\u00e1me \u201esnadn\u00fd\u201c osou. Necht\u011bj\u00ed b\u00fdt magnetizov\u00e1ny v jin\u00fdch sm\u011brech.<\/p>\n

P\u0159\u00ed\u010diny magnetick\u00e9 anizotropie<\/strong><\/span><\/h2>\n

Existuje n\u011bkolik v\u011bc\u00ed, kter\u00e9 zp\u016fsobuj\u00ed magnetickou anizotropii.<\/p>\n

    \n
  1. Krystalov\u00e1 struktura: <\/strong>Symetrie krystalov\u00e9 m\u0159\u00ed\u017eky materi\u00e1lu m\u016f\u017ee vytvo\u0159it snadnou osu. Krychlov\u00e9 materi\u00e1ly \u010dasto cht\u011bj\u00ed sm\u011b\u0159ovat svou magnetizaci pod\u00e9l t\u011blesov\u00e9 diagon\u00e1ly. Nekrychlov\u00e9 materi\u00e1ly cht\u011bj\u00ed sm\u011b\u0159ovat svou magnetizaci pod\u00e9l ur\u010dit\u00fdch krystalov\u00fdch os. Tuto vlastnost naz\u00fdv\u00e1me magnetokrystalickou anizotropi\u00ed. To je jedin\u00e1 vnit\u0159n\u00ed p\u0159\u00ed\u010dina anizotropie, proto\u017ee poch\u00e1z\u00ed ze struktury materi\u00e1lu.<\/li>\n
  2. Tvarov\u00e1 anizotropie:<\/strong> Kdy\u017e m\u00e1te ne-sf\u00e9rick\u00e9 objekty, jako jsou tenk\u00e9 vrstvy nebo mal\u00e9 \u010d\u00e1stice, m\u016f\u017eete z\u00edskat anizotropii kv\u016fli povrchov\u00fdm nebo okrajov\u00fdm efekt\u016fm. Tvar materi\u00e1lu ovliv\u0148uje, jak reaguje na vn\u011bj\u0161\u00ed magnetick\u00e9 pole. Demagnetiza\u010dn\u00ed pole jsou odli\u0161n\u00e1 v z\u00e1vislosti na sm\u011bru m\u011b\u0159en\u00ed.<\/li>\n
  3. Spin-orbit\u00e1ln\u00ed vazba: <\/strong>Interakce mezi spinem elektron\u016f a pohybem elektron\u016f kolem j\u00e1dra m\u016f\u017ee zp\u016fsobit, \u017ee magnetizace bude cht\u00edt sm\u011b\u0159ovat ur\u010dit\u00fdm sm\u011brem.<\/li>\n
  4. Magnetoelastick\u00e1 anizotropie:<\/strong> Pokud na materi\u00e1l p\u016fsob\u00edte mechanick\u00fdm nap\u011bt\u00edm nebo tahem, m\u016f\u017eete zm\u011bnit jeho magnetick\u00e9 chov\u00e1n\u00ed.<\/li>\n
  5. V\u00fdm\u011bnn\u00e1 anizotropie:<\/strong>Tato souvis\u00ed s interakcemi mezi magnetick\u00fdmi momenty v materi\u00e1lech. Kdy\u017e jsou feromagnetick\u00e9 a antiferomagnetick\u00e9 materi\u00e1ly spojeny, m\u016f\u017ee antiferomagnetick\u00e1 vrstva ovlivnit chov\u00e1n\u00ed magnetizace v feromagnetick\u00e9m vrstv\u011b.<\/li>\n
  6. Doping a ne\u010distoty:<\/strong> M\u016f\u017eete z\u00e1m\u011brn\u011b zav\u00e9st ne\u010distoty nebo defekty do materi\u00e1lu, aby se zm\u011bnila jeho elektronick\u00e1 struktura, co\u017e m\u016f\u017ee ovlivnit jeho magnetick\u00e9 chov\u00e1n\u00ed a anizotropii.<\/li>\n
  7. Nap\u011bt\u00ed:<\/strong> Kdy\u017e mechanicky deformujete materi\u00e1l, naru\u0161ujete symetrii jeho krystalov\u00e9 struktury. Tato deformace m\u016f\u017ee zm\u011bnit um\u00edst\u011bn\u00ed snadn\u00e9 osy a jej\u00ed magnetick\u00e9 chov\u00e1n\u00ed.<\/li>\n<\/ol>\n

     <\/p>\n

    Typy magnetick\u00e9 anizotropie<\/strong><\/span><\/h2>\n

    Existuje n\u011bkolik r\u016fzn\u00fdch typ\u016f magnetick\u00e9 anizotropie.<\/p>\n

      \n
    1. Kry\u0161talick\u00e1 anizotropie:<\/strong>toto je okam\u017eik, kdy krystalov\u00e1 symetrie materi\u00e1lu ur\u010duje, kde je snadn\u00e1 osa. To lze vid\u011bt u krychlov\u00fdch a nekrychlov\u00fdch materi\u00e1l\u016f.<\/li>\n
    2. Tvarov\u00e1 anizotropie:<\/strong> toto je okam\u017eik, kdy tvar materi\u00e1lu ur\u010duje, kde je snadn\u00e1 osa. Vid\u00edte to u tenk\u00fdch vrstev a nano\u010d\u00e1stic.<\/li>\n
    3. Magnetostrikce:<\/strong> toto je okam\u017eik, kdy magnetismus materi\u00e1lu interaguje s m\u0159\u00ed\u017ekovou strukturou a materi\u00e1l se roz\u0161i\u0159uje nebo smr\u0161\u0165uje, kdy\u017e na n\u011bj p\u016fsob\u00edte magnetick\u00e9 pole.<\/li>\n
    4. Anizotropie magnetick\u00e9ho pole: Toto je, kdy\u017e m\u00e1 materi\u00e1l vysokou magnetickou susceptibilitu a vn\u011bj\u0161\u00ed magnetick\u00e9 pole interaguje s magnetick\u00fdmi momenty v materi\u00e1lu r\u016fzn\u011b v z\u00e1vislosti na sm\u011bru, kter\u00fdm sm\u011b\u0159uje pole.<\/li>\n<\/ol>\n

      <\/h2>\n

      Anizotropie u tvrd\u00fdch a m\u011bkk\u00fdch magnetick\u00fdch materi\u00e1l\u016f<\/strong><\/span><\/h2>\n

      Tvrd\u00e9 magnetick\u00e9 materi\u00e1ly: <\/strong>Tyto materi\u00e1ly, jako nap\u0159\u00edklad neodymov\u00e9 magnety<\/span><\/a>, maj\u00ed vysokou magnetickou anizotropii, tak\u017ee jsou odoln\u00e9 v\u016f\u010di demagnetizaci. Jejich siln\u00e9, sm\u011brov\u00e9 magnetick\u00e9 vlastnosti vyu\u017e\u00edv\u00e1me v aplikac\u00edch jako jsou motory a gener\u00e1tory.<\/p>\n

      M\u011bkk\u00e9 magnetick\u00e9 materi\u00e1ly:<\/strong> M\u00e9n\u011b \u010dasto mohou b\u00fdt m\u011bkk\u00e9 magnetick\u00e9 materi\u00e1ly tak\u00e9 anizotropn\u00ed kv\u016fli vnit\u0159n\u00edm struktur\u00e1ln\u00edm faktor\u016fm nebo vn\u011bj\u0161\u00edm zpracovatelsk\u00fdm metod\u00e1m. P\u0159\u00edklady zahrnuj\u00ed zrnn\u011b orientovan\u00e9 elektrick\u00e9 oceli pou\u017e\u00edvan\u00e9 v transform\u00e1torech.<\/p>\n

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

      Dosahov\u00e1n\u00ed lep\u0161\u00ed magnetick\u00e9 anizotropie<\/strong><\/span><\/h2>\n

      V\u00fdrobci mohou zlep\u0161it magnetickou anizotropii pe\u010dliv\u00fdm \u0159\u00edzen\u00edm n\u011bkolika faktor\u016f b\u011bhem v\u00fdroby:<\/p>\n

      V\u00fdb\u011br materi\u00e1lu: <\/strong>Volba z\u00e1kladn\u00edho materi\u00e1lu, nap\u0159\u00edklad neodymu v magnetech s vysok\u00fdm v\u00fdkonem, je kl\u00ed\u010dov\u00e1 pro dosa\u017een\u00ed siln\u00fdch magnetick\u00fdch vlastnost\u00ed.<\/p>\n

      Orientace a techniky zpracov\u00e1n\u00ed: <\/strong>P\u0159i v\u00fdrob\u011b magnetu zarovn\u00e1me magnetick\u00e9 momenty pomoc\u00ed proces\u016f jako je hork\u00e9 lisov\u00e1n\u00ed nebo izostatick\u00e9 lisov\u00e1n\u00ed. To n\u00e1m pom\u00e1h\u00e1 vyr\u00e1b\u011bt magnety s lep\u0161\u00edmi anizotropn\u00edmi vlastnostmi.<\/p>\n

      Velikost a tvar zrna: <\/strong>M\u00e1me dobr\u00e9 kontrolu nad velikost\u00ed a tvarem zrna materi\u00e1lu, aby m\u011bl konzistentn\u00ed magnetick\u00e9 vlastnosti.<\/p>\n

      Obsah kysl\u00edku: <\/strong>Sn\u00ed\u017eujeme mno\u017estv\u00ed kysl\u00edku b\u011bhem v\u00fdroby, aby materi\u00e1l l\u00e9pe plynul a zachoval anizotropii.<\/p>\n

      Perpendikul\u00e1rn\u00ed stla\u010den\u00ed za magnetick\u00e9ho pole:<\/strong> P\u0159i stla\u010dov\u00e1n\u00ed materi\u00e1lu b\u011bhem v\u00fdroby zarovn\u00e1me magnetick\u00e9 momenty. Takto z\u00edsk\u00e1v\u00e1me anizotropii v kone\u010dn\u00e9m produktu.<\/p>\n

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

      Anizotropn\u00ed vs. Izotropn\u00ed magnety<\/strong><\/span><\/h2>\n

      Anizotropn\u00ed magnety: <\/strong>Tyto magnety maj\u00ed magnetick\u00e9 vlastnosti z\u00e1visl\u00e9 na sm\u011bru. Nap\u0159\u00edklad vyr\u00e1b\u00edme sinterovan\u00e9 neodymiov\u00e9 magnety, u kter\u00fdch jsou zrna b\u011bhem v\u00fdroby zarovn\u00e1na. To jim poskytuje siln\u00fd magnetick\u00fd v\u00fdkon v jednom preferovan\u00e9m sm\u011bru.<\/p>\n

      Izotropn\u00ed magnety:<\/strong> Naopak, izotropn\u00ed magnety, jako jsou v\u00e1zan\u00e9 neodymiov\u00e9 magnety, nemaj\u00ed preferovan\u00fd sm\u011br magnetizace. Maj\u00ed podobn\u00e9 magnetick\u00e9 vlastnosti ve v\u0161ech sm\u011brech. To jim umo\u017e\u0148uje tvarovat a magnetizovat je v r\u016fzn\u00fdch orientac\u00edch. Obecn\u011b jsou slab\u0161\u00ed ne\u017e anizotropn\u00ed magnety.<\/p>\n

       <\/p>\n

      Pou\u017eit\u00ed anizotropn\u00edch magnet\u016f<\/strong><\/span><\/h2>\n

      Anizotropn\u00ed magnety maj\u00ed mnoho vyu\u017eit\u00ed v r\u016fzn\u00fdch odv\u011btv\u00edch, proto\u017ee maj\u00ed siln\u011bj\u0161\u00ed magnetickou s\u00edlu a sm\u011brovost. Zde je n\u011bkolik p\u0159\u00edklad\u016f:<\/p>\n

        \n
      1. Senzory: <\/strong>Pou\u017e\u00edv\u00e1me anizotropn\u00ed magnety, jako jsou samarium-kobaltov\u00e9 magnety, v senzorech, kter\u00e9 m\u011bn\u00ed magnetick\u00e1 pole na elektrick\u00e9 sign\u00e1ly. Tyto senzory najdete v automobilov\u00fdch a leteck\u00fdch syst\u00e9mech.<\/li>\n
      2. Gener\u00e1tory: <\/strong>Magnetick\u00e9 pole vytv\u00e1\u0159en\u00e9 anizotropn\u00edmi magnety pou\u017e\u00edv\u00e1me k v\u00fdrob\u011b gener\u00e1tor\u016f. Nap\u0159\u00edklad magnety v v\u011btrn\u00fdch turb\u00edn\u00e1ch jsou anizotropn\u00ed.<\/li>\n
      3. Chlazen\u00ed:<\/strong> Lid\u00e9 prov\u00e1d\u011bj\u00ed v\u00fdzkum, jak vyu\u017e\u00edt magnety v chlazen\u00ed. Nap\u0159\u00edklad MIT pracuje na vyu\u017eit\u00ed magnet\u016f jako potenci\u00e1ln\u00edho chladiva.<\/li>\n
      4. Nukle\u00e1rn\u00ed magnetick\u00e1 rezonance (NMR): <\/strong>Pou\u017e\u00edv\u00e1me anizotropn\u00ed magnety k v\u00fdrob\u011b NMR spektrometr\u016f. Tyto p\u0159\u00edstroje n\u00e1m umo\u017e\u0148uj\u00ed studovat fyzik\u00e1ln\u00ed a chemick\u00e9 vlastnosti materi\u00e1l\u016f.<\/li>\n
      5. L\u00e9ka\u0159sk\u00e9 aplikace: <\/strong>Anizotropn\u00ed magnety jsou stabiln\u00ed p\u0159i vysok\u00fdch teplot\u00e1ch, proto je pou\u017e\u00edv\u00e1me v sterilizovateln\u00fdch l\u00e9ka\u0159sk\u00fdch za\u0159\u00edzen\u00edch a implant\u00e1tech.<\/li>\n<\/ol>\n

        Znalost magnetick\u00e9 anizotropie v\u00e1m pom\u00e1h\u00e1 vyu\u017e\u00edvat magnety co nejefektivn\u011bji ve va\u0161em konkr\u00e9tn\u00edm pou\u017eit\u00ed. Anizotropn\u00ed magnety maj\u00ed sm\u011br, co\u017e je velk\u00fd rozd\u00edl. Proto jsou pou\u017e\u00edv\u00e1ny v tolika r\u016fzn\u00fdch odv\u011btv\u00edch, od energetiky po zdravotnictv\u00ed. Izotropn\u00ed magnety v\u00e1m d\u00e1vaj\u00ed v\u011bt\u0161\u00ed flexibilitu v n\u00e1vrhu, ale nejsou tak siln\u00e9. Pokud se chcete dozv\u011bd\u011bt v\u00edce o magnetick\u00fdch materi\u00e1lech a jak v\u00e1m mohou pomoci, kontaktujte n\u00e1s kdykoli.<\/p>\n

        \"Magnetick\u00e1

        Magnetick\u00e1 anizotropie. Zdroj obr\u00e1zku: Wikipedia<\/span><\/p><\/div>","protected":false},"excerpt":{"rendered":"

        Magnetick\u00e1 anizotropie znamen\u00e1, \u017ee materi\u00e1l m\u00e1 preferovan\u00fdm sm\u011brem pro sv\u00e9 magnetick\u00e9 momenty, kdy\u017e na n\u011bj p\u016fsob\u00ed magnetick\u00e9 pole. Jednodu\u0161e \u0159e\u010deno, znamen\u00e1 to, \u017ee zp\u016fsob, jak\u00fdm je materi\u00e1l orientov\u00e1n, ovliv\u0148uje jeho magnetick\u00e9 chov\u00e1n\u00ed. N\u011bkter\u00e9 materi\u00e1ly se cht\u011bj\u00ed v\u00edce magnetizovat v jednom sm\u011bru ne\u017e [\u2026]<\/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\/cs\/wp-json\/wp\/v2\/posts\/1406","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/comments?post=1406"}],"version-history":[{"count":3,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/posts\/1406\/revisions"}],"predecessor-version":[{"id":1414,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/posts\/1406\/revisions\/1414"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/media\/1405"}],"wp:attachment":[{"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/media?parent=1406"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/categories?post=1406"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nbaem.com\/cs\/wp-json\/wp\/v2\/tags?post=1406"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}