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Ferromagnetism in manganese compound semiconductors not only opens prospects for tailoring magnetic and spin-related phenomena in semiconductors with a precision specific to III-V compounds but also addresses a question about the origin of the magnetic interactions that lead to a Curie temperature (T(C)) as high as 110 K for a manganese concentration of just 5%. Zener's model of ferromagnetism, originally proposed for transition metals in 1950, can explain T(C) of Ga(1-)(x)Mn(x)As and that of its II-VI counterpart Zn(1-)(x)Mn(x)Te and is used to predict materials with T(C) exceeding room temperature, an important step toward semiconductor electronics that use both charge and spin.
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T. Dietl
Hideo Ohno
F. Matsukura
Science
Tohoku University
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Dietl et al. (Fri,) studied this question.
www.synapsesocial.com/papers/69d99e71c7f0c3ae80a3dfe7 — DOI: https://doi.org/10.1126/science.287.5455.1019