期刊
PHYSICAL REVIEW LETTERS
卷 84, 期 11, 页码 2501-2504出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.2501
关键词
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We conduct a theoretical study of the temperature dependence of the spin polarization (P) and the magnetoresistance (MR) ratio using the double exchange (DE) model for ferromagnetic tunnel junctions with half-metallic systems. It is shown that the strong exchange coupling in the DE model plays an important role in the temperature dependence of both P and the MR ratio; their values can be less than the maximum values expected for half-metallic systems at low temperatures, and the MR ratio decreases more rapidly than P with increasing temperature. The calculated results, however, indicate that the MR ratio may still be large at high temperatures near the Curie temperature.
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