铁磁性
材料科学
凝聚态物理
金属
马格农
自旋极化
极化(电化学)
声子
半金属
自旋电子学
冶金
化学
物理
物理化学
量子力学
电子
作者
Peter A. Dowben,Ralph Skomski
摘要
Several classes of materials are currently under investigation as potential high-spin-polarization materials. Unfortunately, the proposed half-metallic materials, including the semi-Heusler alloys, the manganese perovskites, and the “simpler” oxides such as chromium dioxide and magnetite, suffer from fundamental limitations. First, the postulated half-metallic systems lose their full (T=0) spin polarization at finite temperatures and, second, surfaces, interfaces, and structural inhomogenities destroy the complete spin polarization of half-metallic systems even at zero temperature. In a strict sense, half-metallic ferromagnetism is limited to zero temperature since magnon and phonon effects lead to reductions in polarization at finite temperatures.
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