Local environment of ferromagnetically ordered Mn in epitaxial InMnAs | Zendy

Philip Chiu | Zendy; Bruce W. Wessels | Zendy; D. J. Keavney | Zendy; J. W. Freeland | Zendy

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Local environment of ferromagnetically ordered Mn in epitaxial InMnAs

Author(s) -

Philip Chiu,

Bruce W. Wessels,

D. J. Keavney,

J. W. Freeland

Publication year - 2005

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.1855427

Subject(s) - magnetic circular dichroism , ferromagnetism , circular dichroism , dichroism , condensed matter physics , absorption spectroscopy , magnetic semiconductor , spectral line , spectroscopy , chemistry , absorption edge , linear dichroism , absorption (acoustics) , epitaxy , crystallography , materials science , physics , band gap , optics , organic chemistry , layer (electronics) , quantum mechanics , astronomy , composite material

The magnetic properties of the ferromagnetic semiconductor In0.98Mn0.02Aswere characterized by x-ray absorption spectroscopy and x-ray magnetic circulardichroism. The Mn exhibits an atomic-like L2,3 absorption spectrum thatindicates that the 3d states are highly localized. In addition, a largedichroism at the Mn L2,3 edge was observed from 5-300 K at an applied field of2T. A calculated spectrum assuming atomic Mn2+ yields the best agreement withthe experimental InMnAs spectrum. A comparison of the dichroism spectra of MnAsand InMnAs show clear differences suggesting that the ferromagnetism observedin InMnAs is not due to hexagonal MnAs clusters. The temperature dependence ofthe dichroism indicates the presence of two ferromagnetic species, one with atransition temperature of 30 K and another with a transition temperature inexcess of 300 K. The dichroism spectra are consistent with the assignment ofthe low temperature species to random substitutional Mn and the hightemperature species to Mn near-neighbor pairs.Comment: 10 pages, 4 figures, accepted by Applied Physics Letter

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