ＣｏＰｔ／Ｒｕパターン膜の磁化反転機構とスイッチング磁界

• 三塚 要

  東北大学　電気通信研究所

• 島津 武仁

  東北大学　電気通信研究所

• 村岡 裕明

  東北大学　電気通信研究所

• Kikuchi N.

  SMI, MESA+, University of Twente

• Lodder J. C.

  SMI, MESA+, University of Twente

書誌事項

タイトル別名

• Magnetization Reversal and Switching Field of CoPt/Ru Patterned Films

抄録

Dot arrays with diameter D = 80-245 nm were made from Co₈₀Pt₂₀ (20 nm) films with a large perpendicular anisotropy energy. Coercivity increases as D decreases, and reaches 7.6 kOe at D = 80 nm. The switching volume for the dot arrays, estimated from the field sweep-rate dependence of the coercivity, was very small in comparison with the dot volume: about 7% of the dot volume when D = 140 nm, for instance. However, the angular dependence coercivity of these dots exibits a typical rotational type of magnetization reversal. Moreover, MFM images revealed that all the dots show a single domain state during the magnetization reversal. Comparison of the coercivity and the anisotropy field suggests that the reversal process starts from a nucleation at the center of the dot followed by a propagation process. This possibility was confirmed by numerical calculation. It was estimated that the switching field distribution, SFD, of dot arrays was mainly due to the distributions of the c-axis of the hcp-CoPt lattice and the dot diameter. Calculated results indicate that the magneto-static coupling between the dot arrays must be a dominant factor in determining the SFD value when the dots are used for patterned media with a recording density of ∼1 Tbits/inch².

収録刊行物

• 日本応用磁気学会誌

  日本応用磁気学会誌 30 (2), 100-107, 2006

  公益社団法人 日本磁気学会

キーワード

• CoPt films
• patterned films
• dot arrays
• magnetization reversal mechanism
• uniaxial anisotropy
• coercive force
• switching field distribution

詳細情報

• CRID: 1390001205091360384
• NII論文ID: 130004478991
• NII論文ID: 30029364845
• DOI: 10.3379/jmsjmag.30.100
• COI: 1:CAS:528:DC%2BD28XltVWqu7o%3D
• ISSN: 18804004
• ISSN: 02850192
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可