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
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
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.
Received: 02 July 2001
Revised: 15 October 2001
Accepted manuscript online:
PACS:
75.70.Ak
(Magnetic properties of monolayers and thin films)
(Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 59971041) and by the National "Climbing" Programme of China (Grant No. G2000067102).
Cite this article:
Wang Huai-Yu (王怀玉), Zhou Yun-Song (周云松), Wang Chong-Yu (王崇愚), D. L. Lin Investigation of ultra-thin ferromagnetic films with a simple cubic lattice 2002 Chinese Physics 11 167
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