Effect of the spin-orbit interaction on the band gap of half metals

被引：107

作者：

Mavropoulos, P ^{[1
]}

Sato, K

Zeller, R

Dederichs, PH

Popescu, V

Ebert, H

机构：

[1] KFA Julich, Forschungszentrum, Inst Festkorperforsch, D-52425 Julich, Germany

[2] Univ Munich, Dept Chem Phys Chem, D-81377 Munich, Germany

来源：

PHYSICAL REVIEW B | 2004年 / 69卷 / 05期

关键词：

D O I：

10.1103/PhysRevB.69.054424

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The spin-orbit interaction can cause a nonvanishing density of states (DOS) within the minority-spin band gap of half metals around the Fermi level. We examine the magnitude of the effect in Heusler alloys, zinc-blende half metals, and diluted magnetic semiconductors, using first-principles calculations. We find that the ratio of spin-down to spin-up DOS at the Fermi level can range from below 1% (e.g., 0.5% for NiMnSb) over several percents [4.2% for (Ga,Mn)As] to 13% for MnBi. This gives a spin polarization P at E-F ranging from above 99% for NiMnSb to Papproximate to92% for (Ga,Mn)As and to Papproximate to77% for MnBi.

引用

页数：5

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