{"id":11897,"date":"2025-08-18T01:55:38","date_gmt":"2025-08-18T01:55:38","guid":{"rendered":"https:\/\/sinoextrud.com\/?p=11897"},"modified":"2025-08-18T01:55:38","modified_gmt":"2025-08-18T01:55:38","slug":"je-hlinik-magneticky","status":"publish","type":"post","link":"https:\/\/sinoextrud.com\/cs\/is-aluminum-magnetic\/","title":{"rendered":"Je hlin\u00edk magnetick\u00fd?"},"content":{"rendered":"

\"nemagnetick\u00fd
Paramagnetick\u00e9 chov\u00e1n\u00ed hlin\u00edku nep\u0159itahuje b\u011b\u017en\u00e9 magnety<\/figcaption><\/figure>\n<\/p>\n

Zkuste p\u0159ilepit magnet na hlin\u00edk - sklouzne. Znamen\u00e1 to ale, \u017ee v\u016fbec nen\u00ed magnetick\u00fd?<\/p>\n

Hlin\u00edk je pova\u017eov\u00e1n za nemagnetick\u00fd, proto\u017ee za norm\u00e1ln\u00edch podm\u00ednek nep\u0159itahuje magnety kv\u016fli slab\u00e9 interakci s magnetick\u00fdm polem.<\/strong><\/p>\n

Je toho v\u0161ak v\u00edce, ne\u017e se na prvn\u00ed pohled zd\u00e1 - zejm\u00e9na pokud se pod\u00edv\u00e1me hloub\u011bji do fyziky a materi\u00e1lov\u00e9 v\u011bdy.<\/p>\n

Jak\u00e9 magnetick\u00e9 vlastnosti m\u00e1 hlin\u00edk?<\/h2>\n

Hlin\u00edk se nechov\u00e1 jako \u017eelezo nebo nikl, ale to neznamen\u00e1, \u017ee zcela postr\u00e1d\u00e1 magnetick\u00e9 vlastnosti.<\/p>\n

Hlin\u00edk je klasifikov\u00e1n jako paramagnetick\u00fd, co\u017e znamen\u00e1, \u017ee p\u0159i vystaven\u00ed vn\u011bj\u0161\u00edmu magnetick\u00e9mu poli m\u00e1 slab\u00e9 a do\u010dasn\u00e9 magnetick\u00e9 vlastnosti.<\/strong><\/p>\n

\"vnit\u0159n\u00ed
P\u00e1rov\u00e1n\u00ed elektron\u016f a struktura vysv\u011btluj\u00ed slabou magnetickou odezvu hlin\u00edku<\/figcaption><\/figure>\n<\/p>\n

Magnetick\u00e9 klasifikace<\/h3>\n

Existuj\u00ed t\u0159i hlavn\u00ed typy magnetismu:<\/p>\n

    \n
  1. Feromagnetick\u00e9<\/strong>: Siln\u00e1 p\u0159ita\u017elivost (nap\u0159. \u017eelezo, kobalt)<\/li>\n
  2. Paramagnetick\u00e9<\/strong>: Slab\u00e1, do\u010dasn\u00e1 p\u0159ita\u017elivost (nap\u0159. hlin\u00edk, ho\u0159\u010d\u00edk)<\/li>\n
  3. Diamagnetick\u00e9<\/strong>: Slab\u00e9 odpuzov\u00e1n\u00ed (nap\u0159. m\u011b\u010f, vizmut)<\/li>\n<\/ol>\n

    Hlin\u00edk je paramagnetick\u00e9<\/strong>. M\u00edrn\u011b se vyrovn\u00e1v\u00e1 s magnetick\u00fdm polem, ale \u00fa\u010dinek je tak slab\u00fd, \u017ee p\u0159i ka\u017edodenn\u00edm pou\u017e\u00edv\u00e1n\u00ed nen\u00ed patrn\u00fd.<\/p>\n

    \u017d\u00e1dn\u00fd permanentn\u00ed magnetismus<\/h3>\n

    Po odstran\u011bn\u00ed vn\u011bj\u0161\u00edho magnetick\u00e9ho pole se hlin\u00edk vr\u00e1t\u00ed do p\u016fvodn\u00edho stavu. Nezachov\u00e1v\u00e1 si magnetizaci jako \u017eelezo.<\/p>\n\n\n\n\n\n\n\n
    Typ materi\u00e1lu<\/th>\nMagnetick\u00e9 chov\u00e1n\u00ed<\/th>\nP\u0159\u00edklad<\/th>\n<\/tr>\n<\/thead>\n
    Feromagnetick\u00e9<\/td>\nSiln\u00fd permanentn\u00ed magnetismus<\/td>\n\u017delezo, ocel<\/td>\n<\/tr>\n
    Paramagnetick\u00e9<\/td>\nSlab\u00e9, do\u010dasn\u00e9 zarovn\u00e1n\u00ed<\/td>\nHlin\u00edk<\/td>\n<\/tr>\n
    Diamagnetick\u00e9<\/td>\nSlab\u00e9 odpuzov\u00e1n\u00ed<\/td>\nM\u011b\u010f<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    <\/svg> Hlin\u00edk m\u00e1 za ur\u010dit\u00fdch podm\u00ednek paramagnetick\u00e9 vlastnosti.<\/b>Pravda<\/span><\/p>

    Hlin\u00edk se m\u00edrn\u011b vyrovn\u00e1v\u00e1 s vn\u011bj\u0161\u00edmi magnetick\u00fdmi poli, ale nen\u00ed trvale zmagnetizov\u00e1n.<\/p><\/div>
    \n

    <\/svg> Hlin\u00edk je p\u0159i ka\u017edodenn\u00edm pou\u017e\u00edv\u00e1n\u00ed siln\u011b p\u0159itahov\u00e1n magnety.<\/b>False<\/span><\/p>

    Slab\u00fd paramagnetismus hlin\u00edku nen\u00ed dostate\u010dn\u011b siln\u00fd na to, aby p\u0159itahoval dom\u00e1c\u00ed magnety.<\/p><\/div><\/p>\n

    Pro\u010d je hlin\u00edk pova\u017eov\u00e1n za nemagnetick\u00fd?<\/h2>\n

    Kdy\u017e se o n\u011b\u010dem \u0159ekne, \u017ee je \u201cnemagnetick\u00e9\u201d, obvykle se t\u00edm mysl\u00ed, \u017ee se to nep\u0159ichyt\u00ed k magnetu.<\/p>\n

    Hlin\u00edk je ozna\u010dov\u00e1n jako nemagnetick\u00fd, proto\u017ee jeho slab\u00e9 paramagnetick\u00e9 chov\u00e1n\u00ed je p\u0159\u00edli\u0161 jemn\u00e9 na to, aby se dalo pozorovat bez v\u011bdeck\u00fdch n\u00e1stroj\u016f.<\/strong><\/p>\n

    \"interakce
    Pohyb v magnetick\u00e9m poli vytv\u00e1\u0159\u00ed v hlin\u00edku v\u00ed\u0159iv\u00e9 proudy.<\/figcaption><\/figure>\n<\/p>\n

    Nedostatek nep\u00e1rov\u00fdch elektron\u016f<\/h3>\n

    Magnetismus kov\u016f je \u010dasto zp\u016fsoben nep\u00e1rov\u00fdmi elektrony v jejich atomov\u00e9 struktu\u0159e. Hlin\u00edk m\u00e1 v\u0161echny elektrony sp\u00e1rovan\u00e9, tak\u017ee nevytv\u00e1\u0159\u00ed magnetick\u00e9 pole.<\/p>\n

    Krystalov\u00e1 struktura<\/h3>\n

    Hlin\u00edk m\u00e1 krychlovou strukturu se soust\u0159ed\u011bnou plochou, kter\u00e1 nepodporuje uspo\u0159\u00e1d\u00e1n\u00ed magnetick\u00fdch dom\u00e9n. To omezuje jeho schopnost zmagnetovat se.<\/p>\n

    \u017d\u00e1dn\u00e1 pozorovateln\u00e1 s\u00edla<\/h3>\n

    Kdy\u017e p\u0159ibl\u00ed\u017e\u00edte magnet k hlin\u00edku, nedojde k \u017e\u00e1dn\u00e9 viditeln\u00e9 reakci. Pro spot\u0159ebitele a in\u017een\u00fdry to znamen\u00e1, \u017ee se v praktick\u00fdch aplikac\u00edch chov\u00e1 jako \u201cnemagnetick\u00fd\u201d materi\u00e1l.<\/p>\n\n\n\n\n\n\n\n
    D\u016fvod<\/th>\nVysv\u011btlen\u00ed<\/th>\n<\/tr>\n<\/thead>\n
    Konfigurace elektron\u016f<\/td>\n\u017d\u00e1dn\u00e9 nesp\u00e1rovan\u00e9 elektrony<\/td>\n<\/tr>\n
    Krystalov\u00e1 struktura<\/td>\n\u017d\u00e1dn\u00e9 magnetick\u00e9 dom\u00e9ny<\/td>\n<\/tr>\n
    N\u00edzk\u00e1 magnetick\u00e1 citlivost<\/td>\nP\u0159\u00edli\u0161 slab\u00e9 pro znateln\u00e9 \u00fa\u010dinky<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    <\/svg> Hlin\u00edk je pova\u017eov\u00e1n za nemagnetick\u00fd, proto\u017ee nem\u00e1 silnou magnetickou p\u0159ita\u017elivost.<\/b>Pravda<\/span><\/p>

    Hlin\u00edk d\u00edky sv\u00e9 slab\u00e9 paramagnetick\u00e9 povaze s magnety viditeln\u011b neinteraguje.<\/p><\/div>
    \n

    <\/svg> Hlin\u00edk obsahuje magnetick\u00e9 dom\u00e9ny stejn\u011b jako \u017eelezo.<\/b>False<\/span><\/p>

    Krystalov\u00e1 struktura hlin\u00edku nepodporuje tvorbu magnetick\u00fdch dom\u00e9n.<\/p><\/div><\/p>\n

    M\u016f\u017ee se hlin\u00edk za zvl\u00e1\u0161tn\u00edch podm\u00ednek st\u00e1t magnetick\u00fdm?<\/h2>\n

    Ano, ale pouze do\u010dasn\u011b a za extr\u00e9mn\u00edch podm\u00ednek.<\/p>\n

    Hlin\u00edk m\u016f\u017ee vykazovat siln\u011bj\u0161\u00ed magnetick\u00e9 \u00fa\u010dinky za ur\u010dit\u00fdch podm\u00ednek, nap\u0159\u00edklad p\u0159i velmi vysok\u00fdch magnetick\u00fdch pol\u00edch, kryogenn\u00edch teplot\u00e1ch nebo p\u0159i pohybu v\u016f\u010di magnetick\u00e9mu poli.<\/strong><\/p>\n

    \"hlin\u00edkov\u00fd
    Pou\u017e\u00edv\u00e1 se v syst\u00e9mech ovlivn\u011bn\u00fdch magnetick\u00fdm brzd\u011bn\u00edm a odvodem tepla.<\/figcaption><\/figure>\n<\/p>\n

    Pohybuj\u00edc\u00ed se hlin\u00edk a v\u00ed\u0159iv\u00e9 proudy<\/h3>\n

    Kdy\u017e se hlin\u00edk pohybuje v magnetick\u00e9m poli, vytv\u00e1\u0159\u00ed kruhov\u00e9 elektrick\u00e9 proudy, tzv. v\u00ed\u0159iv\u00e9 proudy<\/strong>. Ty vytv\u00e1\u0159ej\u00ed vlastn\u00ed magnetick\u00e9 pole, kter\u00e9 odpuzuje<\/strong> magnet. Tento efekt se projevuje v:<\/p>\n

      \n
    • Magnetick\u00e9 brzdov\u00e9 syst\u00e9my<\/strong><\/li>\n
    • Induk\u010dn\u00ed oh\u0159ev<\/strong><\/li>\n
    • Horsk\u00e9 dr\u00e1hy a vlaky<\/strong><\/li>\n<\/ul>\n

      P\u0159esto\u017ee materi\u00e1l nen\u00ed magnetick\u00fd, jeho pohyb v magnetick\u00e9m poli zp\u016fsobuje, \u017ee se \u201cjev\u00ed\u201d jako magnetick\u00fd.<\/p>\n

      Chov\u00e1n\u00ed p\u0159i n\u00edzk\u00fdch teplot\u00e1ch<\/h3>\n

      P\u0159i teplot\u00e1ch bl\u00edzk\u00fdch absolutn\u00ed nule vykazuje hlin\u00edk o n\u011bco v\u00fdrazn\u011bj\u0161\u00ed paramagnetick\u00e9 \u00fa\u010dinky, ale st\u00e1le ne natolik, aby se stal feromagnetick\u00fdm.<\/p>\n

      Nelze magnetizovat<\/h3>\n

      Hlin\u00edk nedok\u00e1\u017ee udr\u017eet magnetismus ani v extr\u00e9mn\u00edch laboratorn\u00edch podm\u00ednk\u00e1ch. V\u017edy se vr\u00e1t\u00ed do p\u016fvodn\u00edho, neutr\u00e1ln\u00edho stavu.<\/p>\n\n\n\n\n\n\n\n
      Stav<\/th>\nMagnetick\u00fd efekt<\/th>\nVysv\u011btlen\u00ed<\/th>\n<\/tr>\n<\/thead>\n
      Pohyb v ter\u00e9nu<\/td>\nVytv\u00e1\u0159\u00ed v\u00ed\u0159iv\u00e9 proudy<\/td>\nVytv\u00e1\u0159\u00ed magnetickou repulzi<\/td>\n<\/tr>\n
      Kryogenn\u00ed teploty<\/td>\nM\u00edrn\u011b siln\u011bj\u0161\u00ed odezva<\/td>\nZvy\u0161uje magnetickou susceptibilitu<\/td>\n<\/tr>\n
      Siln\u00e1 vn\u011bj\u0161\u00ed pole<\/td>\nSlab\u00e9 do\u010dasn\u00e9 zarovn\u00e1n\u00ed<\/td>\nSt\u00e1le nen\u00ed trval\u00fd<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      <\/svg> Hlin\u00edk m\u016f\u017ee p\u0159i pohybu v magnetick\u00e9m poli vytv\u00e1\u0159et magnetickou repulzi.<\/b>Pravda<\/span><\/p>

      K tomu doch\u00e1z\u00ed v d\u016fsledku v\u00ed\u0159iv\u00fdch proud\u016f, nikoli proto, \u017ee by se hlin\u00edk s\u00e1m o sob\u011b st\u00e1val magnetick\u00fdm.<\/p><\/div>
      \n

      <\/svg> Hlin\u00edk se p\u0159i kryogenn\u00edch teplot\u00e1ch m\u016f\u017ee st\u00e1t permanentn\u00edm magnetem.<\/b>False<\/span><\/p>

      I p\u0159i n\u00edzk\u00fdch teplot\u00e1ch z\u016fst\u00e1v\u00e1 hlin\u00edk nemagnetizovateln\u00fd.<\/p><\/div><\/p>\n

      Jak se zkou\u0161\u00ed magnetismus kov\u016f?<\/h2>\n

      Ke zji\u0161t\u011bn\u00ed, zda je kov magnetick\u00fd, nepot\u0159ebujete laborato\u0159 - sta\u010d\u00ed v\u00e1m z\u00e1kladn\u00ed n\u00e1stroje.<\/p>\n

      Magnetismus kovu m\u016f\u017eete otestovat pomoc\u00ed neodymov\u00e9ho magnetu a zkontrolovat p\u0159ita\u017elivost nebo odpudivost, p\u0159\u00edpadn\u011b pou\u017e\u00edt nastaven\u00ed elektromagnetick\u00e9 indukce pro hlub\u0161\u00ed anal\u00fdzu.<\/strong><\/p>\n

      \"lehk\u00fd
      Ide\u00e1ln\u00ed pro pou\u017eit\u00ed v elektronick\u00fdch a nemagnetick\u00fdch konstruk\u010dn\u00edch syst\u00e9mech.<\/figcaption><\/figure>\n<\/p>\n

      Jednoduch\u00fd test magnetu<\/h3>\n

      P\u0159ilo\u017ete ke kovu siln\u00fd magnet (nap\u0159. neodymov\u00fd):<\/p>\n

        \n
      • Pokud se pevn\u011b dr\u017e\u00ed<\/strong>: Je pravd\u011bpodobn\u011b feromagnetick\u00fd<\/li>\n
      • Pokud se nic nestane<\/strong>: M\u016f\u017ee b\u00fdt nemagnetick\u00fd nebo slab\u011b paramagnetick\u00fd.<\/li>\n<\/ul>\n

        Test pohybu (v\u00ed\u0159iv\u00e9 proudy)<\/h3>\n

        Posu\u0148te magnet po \u0161ikm\u00e9m hlin\u00edkov\u00e9m povrchu. Uc\u00edt\u00edte odolnost<\/strong> nebo zpomalen\u00ed<\/strong>. To ukazuje na generov\u00e1n\u00ed v\u00ed\u0159iv\u00fdch proud\u016f - ne magnetismus, ale p\u0159esto magnetickou interakci.<\/p>\n

        Pou\u017eit\u00ed gaussmetru<\/h3>\n

        Pro p\u0159esn\u011bj\u0161\u00ed v\u00fdsledky je t\u0159eba gaussmetr<\/strong> m\u016f\u017ee m\u011b\u0159it magnetick\u00e9 pole v bl\u00edzkosti kovu. Zjist\u00ed, zda kov ovliv\u0148uje magnetick\u00e9 pole, i kdy\u017e nen\u00ed p\u0159itahov\u00e1n.<\/p>\n\n\n\n\n\n\n\n
        Typ testu<\/th>\nPot\u0159ebn\u00fd n\u00e1stroj<\/th>\nOpat\u0159en\u00ed<\/th>\n<\/tr>\n<\/thead>\n
        Test ty\u010d\u00ed<\/td>\nSiln\u00fd magnet<\/td>\nP\u0159ita\u017elivost \/ odpuzov\u00e1n\u00ed<\/td>\n<\/tr>\n
        Skl\u00ed\u010dkov\u00e1 zkou\u0161ka (v\u00ed\u0159iv\u00e1)<\/td>\nRampa + magnet<\/td>\nMagnetick\u00e1 interakce<\/td>\n<\/tr>\n
        Ode\u010det gaussmetr\u016f<\/td>\nGauss\u016fv m\u011b\u0159i\u010d<\/td>\nZkreslen\u00ed pole<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        <\/svg> Pomoc\u00ed testu s magnetick\u00fdm skl\u00ed\u010dkem lze odhalit magnetickou interakci hlin\u00edku prost\u0159ednictv\u00edm v\u00ed\u0159iv\u00fdch proud\u016f.<\/b>Pravda<\/span><\/p>

        Hlin\u00edk sice nen\u00ed magnetick\u00fd, ale pohyb v poli vytv\u00e1\u0159\u00ed odpor v d\u016fsledku indukovan\u00fdch proud\u016f.<\/p><\/div>
        \n

        <\/svg> Pokud se kov nelep\u00ed na magnet, nem\u00e1 \u017e\u00e1dnou interakci s magnetick\u00fdm polem.<\/b>False<\/span><\/p>

        N\u011bkter\u00e9 kovy, nap\u0159\u00edklad hlin\u00edk, interaguj\u00ed prost\u0159ednictv\u00edm v\u00ed\u0159iv\u00fdch proud\u016f, p\u0159esto\u017ee nejsou feromagnetick\u00e9.<\/p><\/div><\/p>\n

        Z\u00e1v\u011br<\/h2>\n

        Hlin\u00edk je p\u0159i ka\u017edodenn\u00edm pou\u017e\u00edv\u00e1n\u00ed nemagnetick\u00fd, ale z v\u011bdeck\u00e9ho hlediska je klasifikov\u00e1n jako paramagnetick\u00fd. A\u010dkoli nep\u0159itahuje magnety jako \u017eelezo, st\u00e1le jedine\u010dn\u00fdm zp\u016fsobem interaguje s magnetick\u00fdm polem, zejm\u00e9na p\u0159i pohybu.<\/p>","protected":false},"excerpt":{"rendered":"

        Aluminum’s paramagnetic behavior doesn’t attract everyday magnets You try to stick a magnet to aluminum\u2014it slides off. But does that mean it\u2019s not magnetic at all? Aluminum is considered non-magnetic because it does not attract magnets under normal conditions due to its weak interaction with magnetic fields. However, there\u2019s more to it than meets the […]<\/p>\n","protected":false},"author":6,"featured_media":8311,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"none","_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-11897","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-custom-mold"],"meta_box":{"post-to-quiz_to":[]},"_links":{"self":[{"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/posts\/11897","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/comments?post=11897"}],"version-history":[{"count":0,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/posts\/11897\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/media\/8311"}],"wp:attachment":[{"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/media?parent=11897"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/categories?post=11897"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sinoextrud.com\/cs\/wp-json\/wp\/v2\/tags?post=11897"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}