Macroscopic Quantum Tunneling of a Domain Wall in a Ferromagnetic Metal
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概要
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The macroscopic quantum tunneling of a planar domain wall in a ferromagnetic metal is studied based on the Hubbard model. An effective action of the magnetization for the slowly varying case is obtained to be the same as that of a ferromagnetic Heisenberg model with a term non-local in time that describes the dissipation due to the itinerant electron. The crucial difference from the case of an insulator is the presence of the Ohmic dissipation even at zero temperature due to the gapless Stoner excitation. The dissipative effect is calculated by use of the instanton method, and is found to be very large for a thin domain wall with thickness of a few times the lattice spacing, but is negligible for a thick domain wall. Dissipation due to eddy current is shown to be irrelevant for a wall of mesoscopic size. The results are discussed in the light of recent experiments on ferromagnets with strong anisotropy.
- 社団法人日本物理学会の論文
- 1994-07-15
著者
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Tatara Gen
Department Of Physics University Of Tokyo
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Tatara Gen
Department Of Earth And Space Science Osaka University
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Fukuyama Hidetoshi
Department Of Applied Physics Faculty Of Science Tokyo University Of Science
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Fukuyama Hidetoshi
Department of Applied Physics and Research Institute for Science and Technology, Tokyo University of Science, Shinjuku, Tokyo 162-8601, Japan
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