Magnetization field-dependences and the "exchange bias" in ferro/antiferromagnetic systems. I. Model of a bilayer ferromagnetic

A. G. Grechnev, A. S. Kovalev, M. L. Pankratova

Research output: Contribution to journalArticle

Abstract

A qualitative model explanation of the experimentally obtained field dependences of the magnetization in ferro- and antiferromagnetic media in contact with one another is proposed. In this model a thin ferromagnetic (FM) film on an antiferromagnetic (AFM) substrate consists of only two ferromagnetic layers. This is the simplest model which admits a spatially nonuniform FM state. In this exactly solvable model it shown that a range of fields exists where a stable collinear (canted) structure of the FM subsystem obtains. This structure corresponds to inclined sections of the field dependence M (H) of the magnetization which are not associated with the kinetics of the magnetization reversal process. In the model proposed, for systems with large easy-plane anisotropy the magnetization reversal process with "exchange bias" taken into account is strictly symmetric as a function of the field provided that the additional weak FM anisotropy in the easy plane is neglected. When this anisotropy in the easy plane is taken into account hysteresis appears in the magnetization curve and the field dependence M (H) becomes asymmetric.

Original languageEnglish
Pages (from-to)476-483
Number of pages8
JournalLow Temperature Physics
Volume35
Issue number6
DOIs
Publication statusPublished - 13 Aug 2009

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magnetization
anisotropy
ferromagnetic films
hysteresis
kinetics
curves

Bibliographical note

© 2009 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Low Temperature Physics 35, 476 (2009) and may be found at https://doi.org/10.1063/1.3151994

Cite this

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title = "Magnetization field-dependences and the {"}exchange bias{"} in ferro/antiferromagnetic systems. I. Model of a bilayer ferromagnetic",
abstract = "A qualitative model explanation of the experimentally obtained field dependences of the magnetization in ferro- and antiferromagnetic media in contact with one another is proposed. In this model a thin ferromagnetic (FM) film on an antiferromagnetic (AFM) substrate consists of only two ferromagnetic layers. This is the simplest model which admits a spatially nonuniform FM state. In this exactly solvable model it shown that a range of fields exists where a stable collinear (canted) structure of the FM subsystem obtains. This structure corresponds to inclined sections of the field dependence M (H) of the magnetization which are not associated with the kinetics of the magnetization reversal process. In the model proposed, for systems with large easy-plane anisotropy the magnetization reversal process with {"}exchange bias{"} taken into account is strictly symmetric as a function of the field provided that the additional weak FM anisotropy in the easy plane is neglected. When this anisotropy in the easy plane is taken into account hysteresis appears in the magnetization curve and the field dependence M (H) becomes asymmetric.",
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Magnetization field-dependences and the "exchange bias" in ferro/antiferromagnetic systems. I. Model of a bilayer ferromagnetic. / Grechnev, A. G.; Kovalev, A. S.; Pankratova, M. L.

In: Low Temperature Physics, Vol. 35, No. 6, 13.08.2009, p. 476-483.

Research output: Contribution to journalArticle

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