Field dependences of the magnetization and exchange bias in ferro/antiferromagnetic systems. II. Continuum model of a ferromagnetic layer

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

doi:10.1063/1.3168638

Field dependences of the magnetization and exchange bias in ferro/antiferromagnetic systems. II. Continuum model of a ferromagnetic layer

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

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Abstract

A model giving a qualitative explanation of the results of an experimental investigation of the 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 with strong easy-plane anisotropy is described in the continuum approximation. It is shown that collinear and canted structures of the ferromagnetic layer can co-exist in the system studied. The ranges of the parameters (exchange interactions in the FM layer and through the FM/AFM interface, thickness of the FM layer, and magnitude of the external magnetic field) where a nonuniform state of the FM exists are found and explicit analytic expressions are obtained for the distribution of the magnetization in this state. The dependences of the total magnetization of the system on the magnitude of the external field are constructed in the physically important cases of "thin" and "thick" FM layers, and it is demonstrated that the experimentally observed unsymmetric dependence M (H) is possible. The results of the present work are compared with our previous results obtained using simpler model of a two-layer FM subsystem.

Original language	English
Pages (from-to)	526-530
Number of pages	5
Journal	Low Temperature Physics
Volume	35
Issue number	7
DOIs	https://doi.org/10.1063/1.3168638
Publication status	Published - 18 Sept 2009

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, 526 (2009) and may be found at https://doi.org/10.1063/1.3168638

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10.1063/1.3168638

Field dependences of the magnetization and exchange bias
© 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, 526 (2009) and may be found at https://doi.org/10.1063/1.3168638
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AU - Pankratova, M. L.

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N2 - A model giving a qualitative explanation of the results of an experimental investigation of the 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 with strong easy-plane anisotropy is described in the continuum approximation. It is shown that collinear and canted structures of the ferromagnetic layer can co-exist in the system studied. The ranges of the parameters (exchange interactions in the FM layer and through the FM/AFM interface, thickness of the FM layer, and magnitude of the external magnetic field) where a nonuniform state of the FM exists are found and explicit analytic expressions are obtained for the distribution of the magnetization in this state. The dependences of the total magnetization of the system on the magnitude of the external field are constructed in the physically important cases of "thin" and "thick" FM layers, and it is demonstrated that the experimentally observed unsymmetric dependence M (H) is possible. The results of the present work are compared with our previous results obtained using simpler model of a two-layer FM subsystem.

AB - A model giving a qualitative explanation of the results of an experimental investigation of the 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 with strong easy-plane anisotropy is described in the continuum approximation. It is shown that collinear and canted structures of the ferromagnetic layer can co-exist in the system studied. The ranges of the parameters (exchange interactions in the FM layer and through the FM/AFM interface, thickness of the FM layer, and magnitude of the external magnetic field) where a nonuniform state of the FM exists are found and explicit analytic expressions are obtained for the distribution of the magnetization in this state. The dependences of the total magnetization of the system on the magnitude of the external field are constructed in the physically important cases of "thin" and "thick" FM layers, and it is demonstrated that the experimentally observed unsymmetric dependence M (H) is possible. The results of the present work are compared with our previous results obtained using simpler model of a two-layer FM subsystem.

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Field dependences of the magnetization and exchange bias in ferro/antiferromagnetic systems. II. Continuum model of a ferromagnetic layer

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