中国物理B ›› 1998, Vol. 7 ›› Issue (7): 529-540.doi: 10.1088/1004-423X/7/7/007

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

EXCHANGE COUPLING BETWEEN TWO MAGNETIZED LAYERS IN A METAL

王少峰1, 汪仲诚2, 邹世昌2   

  1. (1)Center of Physics and Mathematics, Xi'an Jiaotong University, Xi'an 710049,China; (2)State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Metallurgy, Academia Sinica, Shanghai 200050, China
  • 收稿日期:1997-08-26 修回日期:1997-12-29 出版日期:1998-07-20 发布日期:1998-07-20

EXCHANGE COUPLING BETWEEN TWO MAGNETIZED LAYERS IN A METAL

Wang Shao-feng (王少峰)a, Wang Zhong-cheng (汪仲诚)b, Zou Shi-chang (邹世昌)b   

  1. a Center of Physics and Mathematics, Xi'an Jiaotong University, Xi'an 710049,China; b State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Metallurgy, Academia Sinica, Shanghai 200050, China
  • Received:1997-08-26 Revised:1997-12-29 Online:1998-07-20 Published:1998-07-20

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摘要： The exchange coupling energy for two magnetized monolayers embedded symmetrically in a metal and polarized in an arbitrary direction has been investigated in contact interaction approximation. Since the model can be solved exactly in particular for free-electron case, the coupling energy contributed from both extended state electrons and bound state electrons is calculated rigorously. For weak interaction, it is found that the leading term in the power-series expansion of density of states can give a correct coupling energy compared with rigorous one while extended state electrons give a much larger coupling energy. Furthermore, the relevant problems such as phase shift, 90°coupling and lattice effects have been discussed; an asymptotic expression of the interlayer coupling has been derived in a different way and used to calculate the exchange energy between magnetic layers in copper with Fermi surface obtained from de Haas-van Alphen effect.

Abstract: The exchange coupling energy for two magnetized monolayers embedded symmetrically in a metal and polarized in an arbitrary direction has been investigated in contact interaction approximation. Since the model can be solved exactly in particular for free-electron case, the coupling energy contributed from both extended state electrons and bound state electrons is calculated rigorously. For weak interaction, it is found that the leading term in the power-series expansion of density of states can give a correct coupling energy compared with rigorous one while extended state electrons give a much larger coupling energy. Furthermore, the relevant problems such as phase shift, 90°coupling and lattice effects have been discussed; an asymptotic expression of the interlayer coupling has been derived in a different way and used to calculate the exchange energy between magnetic layers in copper with Fermi surface obtained from de Haas-van Alphen effect.

中图分类号:  (Magnetic properties of monolayers and thin films)

  • 75.70.Ak
75.30.Et (Exchange and superexchange interactions) 71.18.+y (Fermi surface: calculations and measurements; effective mass, g factor) 71.20.Be (Transition metals and alloys)