中国物理B ›› 2002, Vol. 11 ›› Issue (2): 167-173.doi: 10.1088/1009-1963/11/2/312

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Investigation of ultra-thin ferromagnetic films with a simple cubic lattice

周云松1, D. L. Lin2, 王怀玉3, 王崇愚3   

  1. (1)Department of Physics, Capital Normal University, Beijing 100037, China; (2)Department of Physics, State University of New York at Buffalo, Buffalo, NY 14260-1500, USA; (3)Department of Physics, Tsinghua University, Beijing 100084, China
  • 收稿日期:2001-07-02 修回日期:2001-10-15 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 No. 59971041) and by the National "Climbing" Programme of China (Grant No. G2000067102).

Investigation of ultra-thin ferromagnetic films with a simple cubic lattice

Wang Huai-Yu (王怀玉)a, Zhou Yun-Song (周云松)b, Wang Chong-Yu (王崇愚)a, D. L. Linc    

  1. a Department of Physics, Tsinghua University, Beijing 100084, China; b Department of Physics, Capital Normal University, Beijing 100037, China; c Department of Physics, State University of New York at Buffalo, Buffalo, NY 14260-1500, USA
  • Received:2001-07-02 Revised:2001-10-15 Online:2002-02-13 Published:2005-06-13
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 59971041) and by the National "Climbing" Programme of China (Grant No. G2000067102).

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摘要： Using Green's function method, we investigate ferromagnetic films with a simple cubic lattice containing up to ten monolayers. The Hamiltonian includes the Heisenberg exchange term, surface anisotropy (SA) and dipole interaction (DI). We calculate the magnetization as a function of temperature and film thickness, and we analyse the behaviour of spin canting. The result is in agreement with experiments. We calculate phase diagrams of SA versus DI to show the conditions under which spontaneous magnetization can occur. As a special case, we discuss the Heisenberg model without SA and DI.

Abstract: Using Green's function method, we investigate ferromagnetic films with a simple cubic lattice containing up to ten monolayers. The Hamiltonian includes the Heisenberg exchange term, surface anisotropy (SA) and dipole interaction (DI). We calculate the magnetization as a function of temperature and film thickness, and we analyse the behaviour of spin canting. The result is in agreement with experiments. We calculate phase diagrams of SA versus DI to show the conditions under which spontaneous magnetization can occur. As a special case, we discuss the Heisenberg model without SA and DI.

Key words: ferromagnetic film, spin canting, Green's function method

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

  • 75.70.Ak
75.30.Cr (Saturation moments and magnetic susceptibilities) 75.10.Jm (Quantized spin models, including quantum spin frustration) 02.30.-f (Function theory, analysis) 75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))