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arxiv: 1008.2872 · v1 · pith:BYN5SZYAnew · submitted 2010-08-17 · ❄️ cond-mat.mtrl-sci · cond-mat.mes-hall

Exchange bias in GeMn nanocolumns: the role of surface oxidation

S. Tardif , S. Cherifi , M. Jamet , T. Devillers , A. Barski , D. Schmitz , N. Darowski , P. Thakur
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J. C. Cezar N. B. Brookes R. Mattana J. Cibert
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classification ❄️ cond-mat.mtrl-sci cond-mat.mes-hall
keywords nanocolumnsexchangegemnbiascapsenhancementferromagneticsurface
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We report on the exchange biasing of self-assembled ferromagnetic GeMn nanocolumns by GeMn-oxide caps. The x-ray absorption spectroscopy analysis of this surface oxide shows a multiplet fine structure that is typical of the Mn2+ valence state in MnO. A magnetization hysteresis shift |HE|~100 Oe and a coercivity enhancement of about 70 Oe have been obtained upon cooling (300-5 K) in a magnetic field as low as 0.25 T. This exchange bias is attributed to the interface coupling between the ferromagnetic nanocolumns and the antiferromagnetic MnO-like caps. The effect enhancement is achieved by depositing a MnO layer on the GeMn nanocolumns.

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