Low Temperature Physics: 44, 1161 (2018); https://doi.org/10.1063/1.5060970
Fizika Nizkikh Temperatur: Volume 44, Number 11 (November 2018), p. 1485-1493    ( to contents , go back )

Exchange bias phenomenon in antiferromagnets with ferromagnetic cluster inclusions

M.L. Pankratova

Aston University, Birmingham, UK

A.S. Kovalev

B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Nauky Ave., Kharkiv 61103, Ukraine
V.N. Karazin Kharkiv National University, Kharkiv 61022, Ukraine
E-mail: kovalev@ilt.kharkov.ua

Received April 23, 2018, published online September 26, 2018

Abstract

Interpretation of exchange bias phenomenon manifestation in antiferromagnets with ferromagnet cluster inclusions after a cooling in external magnetic field was proposed. Ordered in this field AF subsystem activates inhomogeneous state of AFM matrix with finite effective average field at the FM/AFM interface. This field causes to exchange bias in M = M(H) dependence while the further remagnetization of the heterogeneous system. It was proposed the simple 2D model with the circular inclusions of FM phase for the description of the proposed scenario. Using the numerical calculations and the results of the previous analytical analysis the dependence of the magnetization on the external field was obtained. The results interpret qualitatively the peculiarities of the exchange bias phenomenon in the heterogeneous systems.

Key words: ferromagnet, antiferromagnet, interface, exchange bias.

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