Study on the Magnetic and Transport Properties of Low Density Carrier Ferromagnetic Semiconductors : Condensed Matter: Electronic Properties, etc.
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概要
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We developed a Monte Carlo method to study the magnetic and transport properties of low density carrier ferromagnetic (FM) semiconductors. The calculation is carried out for the two-and three-dimensional Ising spin system interacting with electrons through the s-d exchange coupling. When the temperature increases from T = 0, the spontaneous magnetization of the local spins decreases appreciably in the low T range, and steeply at the Curie temperature (T_C). The initial decrease is caused by the almost complete escape of electrons from the spin flipped sites, and accumulation in the FM region. The electron spin polarization is complete in the whole FM temperature range except very near T_C. The Curie temperature shifts to low T side from the value estimated based on the RKKY model as the exchange constant increases. The critical-scattering-like peak of the resistivity appears near T_C when the exchange interaction is not so strong, but it disappears when the interaction is strong. In the former cases, the initial decrease of the magnetization is not so noticeable. The intensity of AC conductivity transfers from 0 range to the frequency range characterized by the excitation energy of the magnetic polaron state.
- 社団法人日本物理学会の論文
- 2001-04-15
著者
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SAKAI Osamu
Department of Physics, Tokyo Metropolitan University
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Sakai Osamu
Department Of Electronic Science And Engineering Kyoto University
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Suzuki Shunya
Information Media Center Hiroshima University
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Suzuki Shunya
Information Processing Center Hiroshima University
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Nozaki Kouichi
Department Of Chemistry And Material Engineering Faculty Of Engineering Shinshu University
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NISHIZAWA Kenichi
Software Engineering, GTO Asia, GE Medical Systems Ltd.
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Nishizawa Kenichi
Department Of Chemistry And Material Engineering Faculty Of Engineering Shinshu University
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Sakai Osamu
Department Of Physics Graduate School Of Science Tokyo Metropolitan University
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Sakai Osamu
Department Of Cardiovascular Surgery Kyoto Prefectural University Of Medicine
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