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 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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July 2009
Research Article|
July 01 2009
Field dependences of the magnetization and exchange bias in ferro/antiferromagnetic systems. II. Continuum model of a ferromagnetic layer
A. G. Grechnev;
A. G. Grechnev
B. I. Verkin Institute for Low-Temperature Physics and Engineering of the National Academy of Sciences of Ukraine
, pr. Lenina 47, Kharkov 61103, Ukraine
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A. S. Kovalev;
A. S. Kovalev
a)
B. I. Verkin Institute for Low-Temperature Physics and Engineering of the National Academy of Sciences of Ukraine
, pr. Lenina 47, Kharkov 61103, Ukraine
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M. L. Pankratova
M. L. Pankratova
V. N. Karazin Kharkov National University
, pl. Svobody 4, Kharkov 61107, Ukraine
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a)
E-Mail: [email protected]
Low Temp. Phys. 35, 526–530 (2009)
Citation
A. G. Grechnev, A. S. Kovalev, M. L. Pankratova; Field dependences of the magnetization and exchange bias in ferro/antiferromagnetic systems. II. Continuum model of a ferromagnetic layer. Low Temp. Phys. 1 July 2009; 35 (7): 526–530. https://doi.org/10.1063/1.3168638
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