Abstract

Semiconductor Physics, Quantum Electronics & Optoelectronics, 21 (2), P. 125-129 (2018).
DOI: https://doi.org/10.15407/spqeo21.02.125


The phenomenon of magnetic exchange bias in ferromagnetic nanocomposites grown by electron beam evaporation
M.V. Radchenko1*, G.V. Lashkarev1, M.E. Bugaiova1, O.E. Baibara1,W. Knoff2, T. Story2, L.A. Krushynskaya3, Y.A. Stelmakh3, Y. Dumond4

1I.M. Frantsevych Institute for Problems of Material Science, National Academy of Sciences of Ukraine, 3, Krzhizhanovskogo str., Kyiv, Ukraine
2Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, Warsaw, Poland
3E.O.Paton Electric Welding Institute, Academy of Sciences of Ukraine, 68, Antonowich str., Kyiv, Ukraine 4Laboratoire GEMaC, University of Versailles St Quentin en Yvelines, Versailles, France
*E-mail: radch@isp.kiev.ua

Abstract. For the first time, in ferromagnetic nanocomposites Co/СoO/Al2O3 formed by two-crucible electron beam evaporation with deposition on a policor substrate, the magnetic exchange bias was observed. It is associated with the magnetic interaction of the ferromagnetic metal core of Co nanoparticles with antiferromagnetic CoO layer on their surface. The low value of magnetic exchange bias is attributed to the small thickness of the CoO shell, inasmuch as the energy of exchange magnetic anisotropy, which decreases with diminishing the antiferromagnetic CoO layer thickness, cannot provide a significant increase of the coercive force when changing the magnetic field direction. The ferromagnetic nanocomposites with the magnetic exchange bias can be used as a bias magnetic layer for magnetoresistive sensors.

Keywords: nanocomposites, ferromagnetic nanoparticles, magnetic exchange bias, electron beam deposition.

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