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BIBTEX RIS

Magnetic anisotropy and valence states in L a 2 C o 1 − x M n <…

2017; American Physical Society; Volume: 95; Issue: 22 Linguagem: Inglês

10.1103/physrevb.95.224434

ISSN

2469-9977

Autores

Laura López‐Mir, Regina Galceran, Javier Herrero‐Martín, Bernat Bozzo, José Cisneros-Fernández, Elisa V. Pannunzio Miner, A. Pomar, Ll. Balcells, B. Martı́nez, Carlos Frontera,

Tópico(s)

Magnetic Properties of Alloys

Resumo

X-ray absorption spectroscopy was used to determine the valence state in La$_2$Co$_{1-x}$Mn$_{1+x}$O$_6$ ($x\approx 0.23$) thin films. We found that in spite of the non-stoichiometry, Co is in a divalent state while Mn ions show a mixed valence state. The relation of this finding with the magnetic properties of the films is discussed. X-ray magnetic circular dichroism measurements prove that magnetic anisotropy originates from Co spin-orbit coupling and it is strain-dependent: a strong increase of the angular contribution to the magnetic moment is found when in-plane (out-of-plane) and cell parameters get expanded (compressed). This behavior is reproduced by first order perturbation theory calculations.

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