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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/47196

Title: Many-body Green's function theory of ferromagnetic films with arbitrary arranged single-ion anistropy
Authors: Huai-Yu Wang
S. U. Jen
Jing-Zhi Yu
Contributors: 國立臺灣海洋大學:光電科學研究所
Date: 2006-03
Issue Date: 2018-07-04T08:30:38Z
Publisher: Phys. Rev. B
Abstract: Abstract: In the treatment of Heisenberg Hamiltonian containing single-ion anisotropy by means of many-body
Green’s function method, the decoupling of the anisotropy term in higher order Green’s functions usually takes
an Anderson-Callen AC form. In this paper, possible improvement schemes of AC decoupling are discussed
by comparison of the results with those of quantum Monte Carlo and frame rotation methods. We choose one
scheme with a factor concerning the effect of the external field. Next, we discuss a possible difficulty of the
frame rotation method in treating systems with single-ion anisotropies in more than one direction. Then we
extended our method Phys. Rev. B 70, 134424 2004 to treat magnetic films. Some magnetic properties of
ultrathin ferromagnetic films with thicknesses up to 16 monolayers are studied. The properties investigated
include transition point, effective anisotropy coefficient, field-induced magnetization reorientation, and hysteresis
loop. Several cases are investigated for uniaxial anisotropy and external field along different directions.
The transition point, the effective anisotropy coefficient, the coercivity, and the loop area increase with increasing
film thickness. The coercivity decreases and the loop area reduces with increasing temperature. The
hysteresis loop along field direction is different from that along easy-axis direction. The coercivity and the area
of the loop obtained in the former case are larger than the latter case. The reasons are analyzed by investigation
of the trajectory of magnetization in detail. The influence of dipole interaction on the magnetic properties is
discussed.
Relation: 11(5) pp.387-405
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/47196
Appears in Collections:[光電科學研究所] 期刊論文

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