Exchange Bias and Spin-Glass-Like Ordering in $\varepsilon$-Fe3N–CrN Nanocomposites

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$\varepsilon$-Fe3N–CrN nanocomposite system is synthesized by wet chemical technique. Exchange bias coupling exists at the interface of the ferromagnetic (FM) $\varepsilon$-Fe3N and antiferromagnetic (AF) CrN phases and the FM $\varepsilon$-Fe3N and AF Fe–O–N/Cr–O–N surface layers. However, the exchange bias is not found to be dependent on the CrN concentration and the coupling of the spins at the surface Fe–O–N/Cr–O–N–$\varepsilon$-Fe3N has a dominating influence. The maximum shift in hysteresis loop is observed to be 78 Oe and the low magnitude of exchange bias is attributed to the roughness of AF–FM interface that induces spin-disorder and random exchange anisotropy. The relaxation dynamics study indicates the presence of antiferromagnetic ordering in this system. Below 65 K, the broad peak in zero-field cooled (ZFC) magnetization curves ($T_{\text{E}}\cong T_{\text{f}}$) indicates the presence of unidirectional anisotropy and spin-glass-like ordering. The spin-glass-like ordering, which arises from the freezing of the clustered randomly oriented spins, is confirmed from the frequency dependence in AC susceptibility measurements and dynamic scaling analysis.

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  • Japanese journal of applied physics. Pt. 1, Regular papers & short notes

    Japanese journal of applied physics. Pt. 1, Regular papers & short notes 46(3A), 980-987, 2007-03-15

    Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physics

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各種コード

  • NII論文ID(NAID)
    10018866823
  • NII書誌ID(NCID)
    AA10457675
  • 本文言語コード
    EN
  • 資料種別
    ART
  • 雑誌種別
    大学紀要
  • ISSN
    0021-4922
  • NDL 記事登録ID
    8688010
  • NDL 雑誌分類
    ZM35(科学技術--物理学)
  • NDL 請求記号
    Z53-A375
  • データ提供元
    CJP書誌  NDL  JSAP 
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