Asymmetric magnetoimpedance in exchange-biased systems

Author:

Gazola J P,Santos M S,de Andrade A M H,Harres AORCID,da Silva R B,Rigue J N,Carara MORCID

Abstract

Abstract Magnetic systems with competing anisotropies generally exhibit asymmetry between the maximum amplitudes of the right and left maxima in a magnetoimpedance curve. Small errors in positioning the samples at the experimental setup may also produce such asymmetry. In this work, we present a study on the sources of the asymmetry between magnetoimpedance peaks in systems that present the exchange bias phenomenon, by comparing a phenomenological model to experimental data. A set of samples with different repetitions of the NiFe/FeMn exchange-biased bilayer was used in this study. From the frequency evolution of the asymmetry, together with magnetization curves, we were able to identify the sources for the observed magnetoimpedance asymmetry found on our experimental data.

Funder

Conselho Nacional de Desenvolvimento Científico e Tecnológico

CAPES

Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul

Publisher

IOP Publishing

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