J. Mater. Sci. Technol. ›› 2011, Vol. 27 ›› Issue (5): 398-402.

• Reviews • 上一篇    下一篇

Effect of Phosphor Addition on Intergranular Exchange Coupling of Co-Pt Thin Films

杨波1,秦高梧1,裴文利2,李松1,任玉平1,S. Ishio3   

  1. 1. 东北大学
    2.
    3. Akita University
  • 收稿日期:2010-09-19 修回日期:2010-10-26 出版日期:2011-05-28 发布日期:2011-05-28
  • 通讯作者: 秦高梧
  • 基金资助:

    教育部新世纪优秀人才支持计划;辽宁省高等学校优秀人才支持计划

Effect of Phosphor Addition on Intergranular Exchange Coupling of Co-Pt Thin Films

Bo Yang1), Gaowu Qin1), Wenli Pei1), Song Li1), Yuping Ren1), Shunji Ishio2)   

  1. 1) Key Laboratory for Anisotropy & Texture of Materials, Northeastern University, Shenyang 110004, China
    2) Department of Material Science & Engineering, Akita University, Akita 0108502, Japan
  • Received:2010-09-19 Revised:2010-10-26 Online:2011-05-28 Published:2011-05-28
  • Contact: Gaowu Qin
  • Supported by:

    the Program for New Century Excellent Talents in University (No. NCET-09-0272) and the Liaoning Program for Excellent Talents in University (No. 2009R23). One of authors, B. Yang appreciates Northeastern University Research Foundation for Excellent Doctor Candidates (No. 200904)

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摘要： In this paper, ternary Co-Pt-P thin films were prepared by magnetron sputtering with platinum and home-made Co-P chips pasted on the cobalt target. The structural and magnetic properties were investigated by X-ray diffraction (XRD) and vibrating sample magnetometer (VSM), respectively. With increasing phosphor content, the coercivities of Co-12at.%Pt-P films increase from 1034 Oe to 1525 Oe owing to the exchange decoupling among magnetic grains. The decrease of inter-granular exchange coupling was confirmed by delta-M curve measurement and magnetic force microscopy (MFM). Transmission electronic microscopy (TEM) with nano-beam composition analysis shows that phosphor segregated at cobalt-based grain boundaries is responsible for the exchange decoupling. It thus suggests that the phosphor addition is effective to tune the exchange coupling of magnetic grains, particularly for perpendicular recording media.

Abstract: In this paper, ternary Co-Pt-P thin films were prepared by magnetron sputtering with platinum and home-made Co-P chips pasted on the cobalt target. The structure and magnetic properties were investigated by X-ray difraction (XRD) and vibrating sample magnetometer (VSM), respectively. With increasing phosphor content, the coercivities of Co-12 at.% Pt-P films increase from 1034 to 1525 Oe owing to the exchange decoupling among magnetic grains. The decrease of inter-granular exchange coupling was confirmed by delta-M curve measurement and magnetic force microscopy (MFM). Transmission electronic microscopy (TEM) with nano-beam composition analysis shows that phosphor segregated at cobalt-based grain boundaries is responsible for
the exchange decoupling. It is thus suggested that the phosphor addition is effective to tune the exchange coupling of magnetic grains, particularly for perpendicular recording media.

Key words: Intergranular exchange coupling, Co-Pt-P, Delta-M, Magnetic recording media