Publications

Data publikacji: 2022-02-14

Beating the limitation of the Néel temperature of FeO with antiferromagnetic proximity in FeO/CoO

A. Koziol-Rachwal, M. Szpytma, Nika Spiridis, Kinga Freindl, Jozef Korecki, W. Janus, H. Nayyef, P. Drozdz, M. Slezak, M. Zajac, T. Slezak

Applied Physics Letters 120 (2022-02-14) 072404
https://doi.org/10.1063/5.0082729
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Abstrakt

In our study, we investigate the influence of the proximity of an antiferromagnetic CoO layer on magnetic properties of ultrathin wustite (FeO) films. Comparative M€ossbauer spectroscopy measurements for MgO/FeO/MgO(001) and MgO/FeO/CoO/MgO(001) show that the neighboring CoO layer can significantly enhance the ordering temperature (TN) of wustite. Importantly, we find that the proximity of antiferromagnetic CoO strongly influences the exchange interaction at the Fe/FeO interface in the Fe/FeO/CoO heterostructure. We observe a 500% enhancement in the exchange bias field and a double increase in the blocking temperature compared to the Fe/FeO bilayer. Our results show that the limitation of the low ordering temperature of a seemingly application-useless antiferromagnet can be overcome by antiferromagnetic proximity.

Lista publikacji

Lista publikacji

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