Model Calculation of Magnetization Reversal Process of Hard Magnet in Nd₂Fe14B System Model Calculation of Magnetization Reversal Process of Hard Magnet in Nd2Fe14B System

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We propose a mechanism that exhibits the coercivity reduction of Nd--Fe--B magnets. The model employed here is a micromagnetic model involving the anisotropy- and exchange-fields obtained by using first-principles calculations. The uniqueness of this model is that it has a c-plane magnetic anisotropy around its surface, in contrast to the bulk c-axis anisotropy. We find that the local c-plane anisotropy drastically affects the coercivity, resulting in a reduction by half of the bulk anisotropy field H_{k}. We also find that partial substitution of Dy for Nd around the surface actually recovers the coercivity.

収録刊行物

  • Applied physics express

    Applied physics express 4(11), 113002-113002-3, 2011-11-25

    The Japan Society of Applied Physics

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各種コード

  • NII論文ID(NAID)
    10030153482
  • NII書誌ID(NCID)
    AA12295133
  • 本文言語コード
    EN
  • 資料種別
    SHO
  • ISSN
    18820778
  • NDL 記事登録ID
    023321194
  • NDL 請求記号
    Z78-A526
  • データ提供元
    CJP書誌  NDL  JSAP 
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