Micromagnetic simulation of exchange coupled ferri-/ferromagnetic heterostructures

Exchange coupled ferri-/ferromagnetic heterostructures are a possible material composition for future magnetic storage and sensor applications. In order to understand the driving mechanisms in the demagnetization process, we perform micromagnetic simulations by employing the Landau–Lifshitz–Gilbert...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2015-05, Vol.381, p.28-33
Main Authors: Oezelt, Harald, Kovacs, Alexander, Reichel, Franz, Fischbacher, Johann, Bance, Simon, Gusenbauer, Markus, Schubert, Christian, Albrecht, Manfred, Schrefl, Thomas
Format: Article
Language:English
Subjects:
Computer simulation
Domain wall motion
Exchange
Exchange-coupled composite media
FEM
Ferrimagnet
Ferrimagnetism
Ferromagnetism
Finite size effect
Heterostructures
Joining
Magnetization reversal
Mathematical analysis
Micromagnetic simulations
Pinning
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Summary:Exchange coupled ferri-/ferromagnetic heterostructures are a possible material composition for future magnetic storage and sensor applications. In order to understand the driving mechanisms in the demagnetization process, we perform micromagnetic simulations by employing the Landau–Lifshitz–Gilbert equation. The magnetization reversal is dominated by pinning events within the amorphous ferrimagnetic layer and at the interface between the ferrimagnetic and the ferromagnetic layer. The shape of the computed magnetization reversal loop corresponds well with experimental data, if a spatial variation of the exchange coupling across the ferri-/ferromagnetic interface is assumed. •We present a model for exchange coupled ferri-/ferromagnetic heterostructures.•We incorporate the microstructural features of the amorphous ferrimagnet.•A distribution of interface exchange coupling is assumed to fit experimental data.•The reversal is dominated by pinning within the ferrimagnet and at the interface.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2014.12.045