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박막수직방향에서 면방향으로 회전하는 인가자기장에 대한 다층박막 [Pt/Co]N-IrMn의 교환바이어스의 각도의존특성

Characteristics of the Angular-dependent Exchange Coupling Bias in Multilayer [Pt/Co]N-IrMn with Toward-in Plane Applied Fields

  • 김순섭 (숙명여자대학교 물리학과) ;
  • 임혜인 (숙명여자대학교 물리학과) ;
  • 이장로 (숙명여자대학교 물리학과) ;
  • 이상석 (상지대학교 동서의료공학과) ;
  • 황도근 (상지대학교 동서의료공학과)
  • Kim, S.S. (Department of Physics, Sookmyung Women's University) ;
  • Yim, H.I. (Department of Physics, Sookmyung Women's University) ;
  • Rhee, J.R. (Department of Physics, Sookmyung Women's University) ;
  • Lee, S.S. (Department of Oriental Biomedical Engineering, Sangji University) ;
  • Hwang, D.G. (Department of Oriental Biomedical Engineering, Sangji University)
  • 발행 : 2008.08.31

초록

마그네트론 스퍼터링방법으로 제작한 다층박막 $[Pt/Co]_N-IrMn$에 측정자기장이 박막면에 수직한 방향에서 면방향으로 각도 $\theta$방향으로 인가될때, 교환결합바이어스($H_{ex}$)와 보자력($H_c$)의 각도의존성이 측정되었다. 자기이력곡선은 인가 자기장축 뿐 아니라 자화축에 대하여도 그 원점이 이동하여 비대칭을 나타내었다. $H__{ex}$$H_c$는 각도$\theta$에 대하여 각각 $1/cos{\theta}$$1/|cos{\theta}|$ 의존성을 나타내며, 이와 같은 각도의존특성은 자기장냉각(박막면에 수직방향)을 통하여 생긴 강한 수직자기이방성에 기인하는 것을 알 수 있다.

The angular dependence of the exchange bias($H_{ex}$) and coercivity($H_c$) in multilayer $[Pt/Co]_N-IrMn$ with applied measuring field rotated toward in-plane at angle $\theta$ from perpendicular-to-plane, has been measured. Multilayer films consisting of $Si/SiO_2/Ta(50)/Pt(4)/[Pt(15)/Co(t_{Co})]_N/IrMn(50)/Ta(50)(in\;{\AA})$ were prepared by magnetron sputtering under typical base pressure below $2{\times}10^{-8}$ Torr at room temperature. Magnetization measurements were performed on a vibrating sample magnetometer and extraordinary Hall voltage measurement systems after cooling from 550 K under a field of 2 kOe applied along the perpendicular to film direction. The hysteresis loop shifts from the origin not only along the field axis but also along the magnetization axis. $H_{ex}$ and $H_c$ show a $1/cos{\theta}$ and $1/|cos{\theta}|$ dependence on the angle($\theta$) between the applied measuring field and the perpendicular-film direction, respectively. This $1/cos{\theta}$ dependence can be accounted for by considering the angular dependence of strong out-of-plane magnetic anisotropy introduced during the field cooling.

키워드

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