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Phys. Rev. B 46, 11129–11132 (1992)

[Issue 17 – 1 November 1992 ]

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Magnetization direction of a semi-infinite Heisenberg ferromagnet with perpendicular surface anisotropy

Yoshikazu Endo

Physics Laboratory, The Nippon Dental University, Fujimi, Chiyoda-ku, Tokyo 102, Japan

The phase transition of a semi-infinite Heisenberg ferromagnet having easy-axis (perpendicular) anisotropy of the form -D_s(S^z)² (D_s>0) in the surface and easy-plane anisotropy of the form -D_b(S^z)² (D_b<0) in the bulk is studied by the molecular-field approximation. For a fixed D_b, three ordered phases, i.e., canted spin, in-plane ordering, and perpendicular ordering phases, are obtained depending on the temperature and the strength of the surface anisotropy D_s.

©1992 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v46/p11129
DOI: 10.1103/PhysRevB.46.11129
PACS: 75.30.Pd, 75.30.Gw, 75.30.Kz

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