中国物理B ›› 2002, Vol. 11 ›› Issue (2): 183-187.doi: 10.1088/1009-1963/11/2/315

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Percolation-related magnetic coupling and magnetoresistance properties in Fe/Si1-xAgx multilayers

王海, 唐云俊, 李祥, 陈熹, 王荫君, 朱涛, 赵宏武, 詹文山   

  1. State Key Laboratory for Magnetism, Institute of Physics and Center of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China
  • 收稿日期:2001-07-10 修回日期:2001-09-25 出版日期:2002-02-13 发布日期:2005-06-13
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 59928101 and 59871063).

Percolation-related magnetic coupling and magnetoresistance properties in Fe/Si1-xAgx multilayers

Wang Hai (王海), Tang Yun-Jun (唐云俊), Li Xiang (李祥), Chen Xi (陈熹), Wang Yin-Jun (王荫君), Zhu Tao (朱涛), Zhao Hong-Wu (赵宏武), Zhan Wen-Shan (詹文山)   

  1. State Key Laboratory for Magnetism, Institute of Physics and Center of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2001-07-10 Revised:2001-09-25 Online:2002-02-13 Published:2005-06-13
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 59928101 and 59871063).

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摘要： In this paper, we present a study of the magnetic coupling and magnetoresistance (MR) properties in Fe/Si1-xAgx multilayers with a granular Si1-xAgx spacer layer. We have found that, with increasing silver content (x) in a silicon matrix, the magnetic state of multilayers changes from a nonmagnetic coupling state to weak antiferromagnetic around the percolation point of the ～2.4 nm thick spacer Si1-xAgx. The MR measurements also reveal an abrupt increase of MR near the same percolation point. These changes are ascribed to the formation of the percolation path in the granular spacer.

Abstract: In this paper, we present a study of the magnetic coupling and magnetoresistance (MR) properties in Fe/Si1-xAgx multilayers with a granular Si1-xAgx spacer layer. We have found that, with increasing silver content (x) in a silicon matrix, the magnetic state of multilayers changes from a nonmagnetic coupling state to weak antiferromagnetic around the percolation point of the ～2.4 nm thick spacer Si1-xAgx. The MR measurements also reveal an abrupt increase of MR near the same percolation point. These changes are ascribed to the formation of the percolation path in the granular spacer.

Key words: interlayer coupling, doping, magnetoresistance

中图分类号:  (Galvanomagnetic and other magnetotransport effects)

  • 72.15.Gd
75.70.Cn (Magnetic properties of interfaces (multilayers, superlattices, heterostructures)) 75.50.Ee (Antiferromagnetics) 75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))