Collective Modes of Spin Excitations and Phase Transitions in a Ferromagnet with Single-Ion Anisotropy
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概要
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Spin-] Heisenberg ferronaagnet with both axial anisotropy, D >: z (.S'f)', and rhom-bic anisotropy, E I z {(,57)" -(.S')')' }, are studied from a viewpoint of the collectivemode. The parameter D is positive and much larger than exchange integral, and Eissmaller than D. The double-tinae temperature dependent Green functions are usedunder the random phase approxiunation in order to calculate the collective modeand to determine the phase boundaries. The paramagnetic phase are divided intotwo regions from the character of the collective mode. The one is the region wherethe collective mode is similar to libron and the other that the collective mode isconventional spin-wave. It is shown that the rhombic anisotropy has a significanteffect on the libron naode, whereas not on the spin-wave mode.
- 社団法人日本物理学会の論文
- 1977-02-15
著者
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Ishikawa Takuma
Department Of Materials Science Iwakimeisei University
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Endo Yoshikazu
Department Of Biological Mechanisms And Functions Graduate School Of Bioagricultural Sciences Nagoya
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Ishikawa Takuma
Department of Electrical and Electronic Engineering, College of Engineering, Nihon University, Tamura-machi, Koriyama, Fukushima 963-8642, Japan
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