Journal
PHYSICAL REVIEW B
Volume 77, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.77.113205
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Funding
- Engineering and Physical Sciences Research Council [GR/S81407/01] Funding Source: researchfish
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We demonstrate a sensitivity of the Mn 3d valence states to strain in the ferromagnetic semiconductors (Ga, Mn)As and (Al, Ga, Mn)As using x-ray magnetic circular dichroism (XMCD). The spectral shape of the Mn L(2,3) XMCD is dependent on the orientation of the magnetization, and features with cubic and uniaxial dependence are distinguished. Reversing the strain reverses the sign of the uniaxial anisotropy of the Mn L(3) prepeak which is ascribed to transitions from the Mn 2p core level to p-d hybridized valence band hole states. With increasing carrier localization, the L(3) prepeak intensity increases, indicating an increasing 3d character of the hybridized holes.
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