{"id":209300,"date":"2024-03-21T14:07:11","date_gmt":"2024-03-21T14:07:11","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/%e5%bc%b7%e7%a3%81%e6%80%a7%e5%85%b1%e9%b3%b4%e3%81%ae%e5%bc%8f-%e6%a6%82%e8%a6%81%e3%81%a8%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95\/"},"modified":"2024-05-17T15:10:13","modified_gmt":"2024-05-17T15:10:13","slug":"%e5%bc%b7%e7%a3%81%e6%80%a7%e5%85%b1%e9%b3%b4%e3%81%ae%e5%bc%8f-%e6%a6%82%e8%a6%81%e3%81%a8%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.electricity-magnetism.org\/ja\/%e5%bc%b7%e7%a3%81%e6%80%a7%e5%85%b1%e9%b3%b4%e3%81%ae%e5%bc%8f-%e6%a6%82%e8%a6%81%e3%81%a8%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95\/","title":{"rendered":"\u5f37\u78c1\u6027\u5171\u9cf4\u306e\u5f0f | \u6982\u8981\u3068\u8a08\u7b97\u65b9\u6cd5"},"content":{"rendered":"<p class=\"sidekick\">\u5f37\u78c1\u6027\u5171\u9cf4\uff08FMR\uff09\u306f\u3001\u5f37\u78c1\u6027\u6750\u6599\u306e\u78c1\u6c17\u7279\u6027\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306e\u73fe\u8c61\u3067\u3001\u30e9\u30fc\u30e2\u30a2\u5468\u6ce2\u6570\u3068\u78c1\u5316\u30c0\u30a4\u30ca\u30df\u30af\u30b9\u306e\u89e3\u660e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n<h2>\u5f37\u78c1\u6027\u5171\u9cf4\u306e\u5f0f | \u6982\u8981\u3068\u8a08\u7b97\u65b9\u6cd5<\/h2>\n<p>\u5f37\u78c1\u6027\u5171\u9cf4\uff08Ferromagnetic Resonance, FMR\uff09\u306f\u3001\u5f37\u78c1\u6027\u6750\u6599\u306b\u304a\u3051\u308b\u78c1\u6027\u30a8\u30cd\u30eb\u30ae\u30fc\u306e\u6df1\u3044\u7406\u89e3\u306b\u5f79\u7acb\u3064\u73fe\u8c61\u3067\u3059\u3002\u3053\u306e\u73fe\u8c61\u306f\u3001\u5916\u90e8\u78c1\u5834\u306e\u5f71\u97ff\u3092\u53d7\u3051\u305f\u78c1\u6027\u30b9\u30d4\u30f3\u306e\u30d7\u30ec\u30bb\u30c3\u30b7\u30e7\u30f3\u904b\u52d5\u306b\u95a2\u9023\u3057\u3066\u3044\u307e\u3059\u3002FMR\u3092\u7406\u89e3\u3059\u308b\u306b\u306f\u3001\u7279\u306b\u30e9\u30fc\u30e2\u30a2\u5468\u6ce2\u6570\u3068\u78c1\u5316\u30c0\u30a4\u30ca\u30df\u30af\u30b9\u306b\u6ce8\u76ee\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n<h2>\u30e9\u30fc\u30e2\u30a2\u5468\u6ce2\u6570<\/h2>\n<p>FMR\u306e\u4e2d\u5fc3\u306b\u3042\u308b\u6982\u5ff5\u306f\u3001\u30e9\u30fc\u30e2\u30a2\u5468\u6ce2\u6570\u3067\u3059\u3002\u3053\u306e\u5468\u6ce2\u6570\u306f\u3001\u78c1\u5316\u304c\u5916\u90e8\u78c1\u5834\u306b\u3088\u3063\u3066\u30d7\u30ec\u30bb\u30c3\u30b7\u30e7\u30f3\u904b\u52d5\u3092\u3059\u308b\u969b\u306e\u5171\u9cf4\u5468\u6ce2\u6570\u3092\u610f\u5473\u3057\u307e\u3059\u3002\u30e9\u30fc\u30e2\u30a2\u5468\u6ce2\u6570\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8868\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\\[ \\omega_0 = \\gamma H_0 \\]<\/p>\n<p>\u3053\u3053\u3067\u3001\\(\\omega_0\\)\u306f\u89d2\u5468\u6ce2\u6570\u3001\\(\\gamma\\)\u306f\u30b8\u30e3\u30a4\u30ed\u78c1\u6c17\u6bd4\u3001\\(H_0\\)\u306f\u5916\u90e8\u78c1\u5834\u306e\u5f37\u3055\u3067\u3059\u3002\u30b8\u30e3\u30a4\u30ed\u78c1\u6c17\u6bd4\\(\\gamma\\)\u306f\u3001\u7279\u5b9a\u306e\u7d20\u6750\u306b\u4f9d\u5b58\u3057\u307e\u3059\u304c\u3001\u7406\u8ad6\u4e0a\u306e\u5024\u306f\u304a\u3088\u305d\\(\\gamma = \\frac{e}{2m}\\)\u3067\u3059\uff08\\(e\\)\u306f\u96fb\u5b50\u306e\u96fb\u8377\u3001\\(m\\)\u306f\u96fb\u5b50\u306e\u8cea\u91cf\uff09\u3002<\/p>\n<h2>\u78c1\u5316\u30c0\u30a4\u30ca\u30df\u30af\u30b9\u3068\u30e9\u30f3\u30c9\u30fc\u2010\u30ea\u30d5\u30b7\u30c3\u30c4\u65b9\u7a0b\u5f0f<\/h2>\n<p>\u78c1\u5316\u30c0\u30a4\u30ca\u30df\u30af\u30b9\u306e\u7406\u89e3\u306b\u306f\u3001\u30e9\u30f3\u30c9\u30fc-\u30ea\u30d5\u30b7\u30c3\u30c4\u65b9\u7a0b\u5f0f\uff08Landau-Lifshitz Equation\uff09\u304c\u91cd\u8981\u3067\u3059\u3002\u3053\u306e\u65b9\u7a0b\u5f0f\u306f\u3001\u78c1\u5316\u30d9\u30af\u30c8\u30eb\\(\\mathbf{M}\\)\u304c\u6642\u9593\u306b\u4f9d\u5b58\u3057\u3066\u3069\u306e\u3088\u3046\u306b\u5909\u5316\u3059\u308b\u304b\u3092\u8a18\u8ff0\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\\[ \\frac{d\\mathbf{M}}{dt} = -\\gamma \\mathbf{M} \\times \\mathbf{H}_{\\text{eff}} &#8211; \\alpha \\frac{\\mathbf{M} \\times (\\mathbf{M} \\times \\mathbf{H}_{\\text{eff}})}{M_s} \\]<\/p>\n<p>\u3053\u3053\u3067\u3001\\(\\mathbf{H}_{\\text{eff}}\\)\u306f\u6709\u52b9\u78c1\u5834\u3001\\(\\alpha\\)\u306f\u6e1b\u8870\u4fc2\u6570\u3001\\(M_s\\)\u306f\u98fd\u548c\u78c1\u5316\u3067\u3059\u3002\u7b2c\u4e00\u9805\u306f\u30d7\u30ec\u30bb\u30c3\u30b7\u30e7\u30f3\u904b\u52d5\u3092\u8aac\u660e\u3057\u3001\u7b2c\u4e8c\u9805\u306f\u6e1b\u8870\u3092\u8868\u3057\u307e\u3059\u3002<\/p>\n<h2>\u5171\u9cf4\u6761\u4ef6<\/h2>\n<p>FMR\u306b\u304a\u3051\u308b\u5171\u9cf4\u6761\u4ef6\u306f\u3001\u6750\u6599\u306e\u78c1\u5316\\(\\mathbf{M}\\)\u3068\u5916\u90e8\u78c1\u5834\\(\\mathbf{H}_0\\)\u306e\u76f8\u4e92\u4f5c\u7528\u306b\u3088\u3063\u3066\u5b9a\u7fa9\u3055\u308c\u307e\u3059\u3002\u5171\u9cf4\u6761\u4ef6\u3092\u6e80\u305f\u3059\u305f\u3081\u306b\u306f\u3001\u78c1\u5316\u306e\u30d7\u30ec\u30bb\u30c3\u30b7\u30e7\u30f3\u904b\u52d5\u3068\u5916\u90e8\u78c1\u5834\u306e\u89d2\u5468\u6ce2\u6570\u304c\u4e00\u81f4\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u6570\u5f0f\u3067\u8868\u3059\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\\[ \\omega = \\gamma H_{\\text{res}} \\]<\/p>\n<p>\u3053\u3053\u3067\u3001\\(H_{\\text{res}}\\)\u306f\u5171\u9cf4\u78c1\u5834\u3067\u3059\u3002\u5b9f\u9a13\u7684\u306b\u306f\u3001\\(H_{\\text{res}}\\)\u306fFMR\u30b9\u30da\u30af\u30c8\u30eb\u3092\u6e2c\u5b9a\u3059\u308b\u3053\u3068\u3067\u6c42\u3081\u3089\u308c\u307e\u3059\u3002<\/p>\n<h2>FMR\u30b9\u30da\u30af\u30c8\u30eb\u306e\u89e3\u6790<\/h2>\n<p>FMR\u30b9\u30da\u30af\u30c8\u30eb\u3092\u89e3\u6790\u3059\u308b\u3053\u3068\u3067\u3001\u6750\u6599\u306e\u7279\u6027\u306b\u3064\u3044\u3066\u591a\u304f\u306e\u60c5\u5831\u3092\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u5171\u9cf4\u30d4\u30fc\u30af\uff08resonance peak\uff09\u3092\u89b3\u5bdf\u3059\u308b\u3053\u3068\u3067\u3001\u78c1\u6c17\u7570\u65b9\u6027\u3084\u6e1b\u8870\u7279\u6027\u306a\u3069\u304c\u308f\u304b\u308a\u307e\u3059\u3002FMR\u30b9\u30da\u30af\u30c8\u30eb\u306e\u5f62\u72b6\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u30ed\u30fc\u30ec\u30f3\u30c4\u95a2\u6570\u3067\u30e2\u30c7\u30eb\u5316\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\\[ I(\\omega) = \\frac{A}{(\\omega &#8211; \\omega_0)^2 + (\\Delta \\omega \/ 2)^2} \\]<\/p>\n<p>\u3053\u3053\u3067\u3001\\(A\\)\u306f\u30d4\u30fc\u30af\u306e\u632f\u5e45\u3001\\(\\omega_0\\)\u306f\u5171\u9cf4\u5468\u6ce2\u6570\u3001\\(\\Delta \\omega\\)\u306f\u30d4\u30fc\u30af\u306e\u534a\u5024\u5168\u5e45\uff08HWHM\uff09\u3067\u3059\u3002\u3053\u306e\u95a2\u6570\u3092\u30d5\u30a3\u30c3\u30c6\u30a3\u30f3\u30b0\u3059\u308b\u3053\u3068\u3067\u3001\u8a66\u6599\u306e\u78c1\u6c17\u7279\u6027\u3092\u8a55\u4fa1\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u5f37\u78c1\u6027\u5171\u9cf4\uff08FMR\uff09\u306f\u3001\u5f37\u78c1\u6027\u6750\u6599\u306e\u78c1\u6c17\u7279\u6027\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306e\u91cd\u8981\u306a\u30c4\u30fc\u30eb\u3067\u3059\u3002\u30e9\u30fc\u30e2\u30a2\u5468\u6ce2\u6570\u3084\u30e9\u30f3\u30c9\u30fc-\u30ea\u30d5\u30b7\u30c3\u30c4\u65b9\u7a0b\u5f0f\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3001FMR\u306e\u57fa\u672c\u7684\u306a\u30e1\u30ab\u30cb\u30ba\u30e0\u3092\u628a\u63e1\u3067\u304d\u307e\u3059\u3002\u3055\u3089\u306b\u3001FMR\u30b9\u30da\u30af\u30c8\u30eb\u306e\u89e3\u6790\u3092\u901a\u3058\u3066\u3001\u5177\u4f53\u7684\u306a\u6750\u6599\u306e\u78c1\u6c17\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u8abf\u3079\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002FMR\u306f\u3001\u73fe\u4ee3\u306e\u78c1\u6027\u7269\u7406\u5b66\u3084\u78c1\u6027\u6750\u6599\u7814\u7a76\u306b\u304a\u3044\u3066\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5f37\u78c1\u6027\u5171\u9cf4\uff08FMR\uff09\u306f\u3001\u5f37\u78c1\u6027\u6750\u6599\u306e\u78c1\u6c17\u7279\u6027\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306e\u73fe\u8c61\u3067\u3001\u30e9\u30fc\u30e2\u30a2\u5468\u6ce2\u6570\u3068\u78c1\u5316\u30c0\u30a4\u30ca\u30df\u30af\u30b9\u306e\u89e3\u660e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_generate-full-width-content":"","footnotes":""},"categories":[96],"tags":[97],"class_list":["post-209300","post","type-post","status-publish","format-standard","hentry","category-96","tag-97","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"yoast_head":"<!-- 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