中国物理B ›› 1998, Vol. 7 ›› Issue (7): 518-528.doi: 10.1088/1004-423X/7/7/006

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INTERLAYER EXCHANGE COUPLING IN COMPLEX MAGNETIC MULTILAYERS

李列明1, 张向东2, 李伯臧2, 蒲富恪3   

  1. (1)Department of Physics, Tinghua University, Beijing 100084, China; (2)Institute of Physics and Center for Condensed Matter Physics,Academia Sinica, Beijing 100080, China; (3)Institute of Physics and Center for Condensed Matter Physics,Academia Sinica, Beijing 100080, China; Department of Physics, Guangzhou Normal College, Guangzhou 510400, China
  • 收稿日期:1997-12-15 出版日期:1998-07-20 发布日期:1998-07-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China(Nos.19677101 and 59392800).

INTERLAYER EXCHANGE COUPLING IN COMPLEX MAGNETIC MULTILAYERS

Zhang Xiang-dong (张向东)a, Li Lie-ming (李列明)b, Li Bo-zang (李伯臧)a, Pu Fu-cho (蒲富恪)ac   

  1. a Institute of Physics and Center for Condensed Matter Physics,Academia Sinica, Beijing 100080, China; b Department of Physics, Tinghua University, Beijing 100084, China; c Department of Physics, Guangzhou Normal College, Guangzhou 510400, China
  • Received:1997-12-15 Online:1998-07-20 Published:1998-07-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China(Nos.19677101 and 59392800).

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摘要： We extend the hole confinement model of Edwards et al. to the problem of two kinds of complex magnetic sandwich structures. One is the magnetic sandwich covered on both sides by nonmagnetic films(case 1) and the other is that covered by magnetic films(case 2). The interlayer exchange coupling and the angular dependence of coupling energy in the two cases are investigated systematically. For case 1, our results show that the magnetic and outer nonmagnetic films influence significantly the oscillation behavior of exchange coupling and the appearance of noncollinear exchange coupling is very sensitive to the thickness of magnetic and outer nonmagnetic layers. Our results also show that the nonoscillatory component of the coupling generally varies with the thickness of magnetic(outer nonmagnetic) films and the results in the case where the thickness of both magnetic(outer nonmagnetic) films vary simultaneously are significantly different from that in the case where the thickness of one of the two magnetic(outer nonmagnetic) films is fixed while the other is varied, which is qualitatively in agreement with the experimental measurements. For case 2, the exponential dependence of exchange coupling on the thickness of the intermagnetic layer has been obtained, similar to the Parkin's experimental results for giant magnetoresistance.

Abstract: We extend the hole confinement model of Edwards et al. to the problem of two kinds of complex magnetic sandwich structures. One is the magnetic sandwich covered on both sides by nonmagnetic films(case 1) and the other is that covered by magnetic films(case 2). The interlayer exchange coupling and the angular dependence of coupling energy in the two cases are investigated systematically. For case 1, our results show that the magnetic and outer nonmagnetic films influence significantly the oscillation behavior of exchange coupling and the appearance of noncollinear exchange coupling is very sensitive to the thickness of magnetic and outer nonmagnetic layers. Our results also show that the nonoscillatory component of the coupling generally varies with the thickness of magnetic(outer nonmagnetic) films and the results in the case where the thickness of both magnetic(outer nonmagnetic) films vary simultaneously are significantly different from that in the case where the thickness of one of the two magnetic(outer nonmagnetic) films is fixed while the other is varied, which is qualitatively in agreement with the experimental measurements. For case 2, the exponential dependence of exchange coupling on the thickness of the intermagnetic layer has been obtained, similar to the Parkin's experimental results for giant magnetoresistance.

中图分类号:  (Magnetic properties of interfaces (multilayers, superlattices, heterostructures))

  • 75.70.Cn
75.30.Et (Exchange and superexchange interactions) 68.55.-a (Thin film structure and morphology)