Results 1 - 10 of 1967
Results 1 - 10 of 1967. Search took: 0.025 seconds
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[en] A short review is given of the theoretical fundamentals, applications and limitations of X-ray magnetic circular dichroism (XMCD) at the M4,5 and L2,3 edges of rare earth compounds. (orig.)
[en] We present a valence-state model to explain the characteristics of a recently observed pre-edge feature in Mn L3 x-ray magnetic circular dichroism (XMCD) of ferromagnetic (Ga,Mn)As and (Al,Ga,Mn)As thin films. The prepeak XMCD shows a uniaxial anisotropy, contrary to the cubic symmetry of the main structures induced by the crystalline electric field. Reversing the strain in the host lattice reverses the sign of the uniaxial anisotropy. With increasing carrier localization, the prepeak height increases, indicating an increasing 3d character of the hybridized holes. Hence, the feature is ascribed to transitions from the Mn 2p core level to unoccupied p-d hybridized valence states. The characteristics of the prepeak are readily reproduced by the model calculation taking into account the symmetry of the strain-, spin-orbit-, and exchange-split valence states around the zone center.
[en] We report a high statistic x-ray magnetic circular dichroism study of USb0.5Te0.5 carried out at the uranium MIV,V edges. Using the sum rules, the detailed analysis of our data yields orbital and spin moments of the 5f uranium electrons in reasonable agreement with values extracted from a localized moment approach. (author)