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Exchange bias in GeMn nanocolumns: the role of surface oxidation

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.

preprint2010arXivOpen access
S. TardifS. CherifiM. JametT. DevillersA. BarskiD. SchmitzN. DarowskiP. ThakurJ. C. CezarN. B. BrookesR. MattanaJ. Cibert
cond-mat.mes-hallcond-mat.mtrl-sci
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Open access12 authors2 topics
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S. TardifS. CherifiM. JametT. DevillersA. BarskiD. SchmitzN. DarowskiP. ThakurJ. C. CezarN. B. BrookesR. MattanaJ. Cibert

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