Exchange spring structures and coercivity reduction in FePt∕FeRh bilayers: A comparison of multiscale and micromagnetic calculations
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- F. Garcia-Sanchez
- CSIC Instituto de Ciencia de Materiales de Madrid, , Cantoblanco, E-28049 Madrid, Spain
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- O. Chubykalo-Fesenko
- CSIC Instituto de Ciencia de Materiales de Madrid, , Cantoblanco, E-28049 Madrid, Spain
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- O. Mryasov
- Seagate Research , 1251 Waterfront Place, Pittsburgh, Pennsylvania 15222
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- R. W. Chantrell
- Seagate Research , 1251 Waterfront Place, Pittsburgh, Pennsylvania 15222
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- K. Yu. Guslienko
- Argonne National Laboratory , Argonne, Illinois 60439
書誌事項
- 公開日
- 2005-09-12
- DOI
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- 10.1063/1.2051789
- 公開者
- AIP Publishing
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説明
<jats:p>Calculations of magnetization reversal mechanism and coercivity reduction in exchange coupled FePt∕FeRh bilayers are presented. It is shown by comparison with atomistic model calculations that the use of a standard micromagnetic model leads to an underestimation of the exchange energy at the interface, leading to a reduced coercivity decrease for small interfacial exchange energy constant. This is due to the failure of the domain wall (DW) to penetrate the hard FePt phase in the micromagnetic calculations. A multiscale model is proposed based an atomic level simulation in the interface region coupled with a micromagnetic approach elsewhere. This leads to improved calculations of DW structures at the interface, allowing a detailed study of the magnetization reversal mechanism. The new approach predicts a saturation in the coercivity reduction as a function of interface exchange energy at 4% of the bulk value, which is associated with complete continuity of the DW across the interface.</jats:p>
収録刊行物
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- Applied Physics Letters
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Applied Physics Letters 87 (12), 2005-09-12
AIP Publishing
