1. Micromagnetic Modelling of Hysteresis in Permalloy Thin Films with Non-Magnetic Defects
- Author
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Inna Lobanova, Stéphane Labbé, Stéphane Despréaux, Laboratoire Jean Kuntzmann (LJK), Institut National de Recherche en Informatique et en Automatique (Inria)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Laboratoire Jacques-Louis Lions (LJLL (UMR_7598)), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), and The work described in the present paper has been developed within the project 'Online Microstructure Analytics' (Ref. OMA,Grant Agreement No. 847296) that has received funding from the Research Fund for Coal and Steel of the European Union, which is gratefully acknowledged
- Subjects
Hysteresis ,Spintronics ,Domain walls movement ,Micromagnetic modelling ,Soft magnetic materials ,[SPI.MAT]Engineering Sciences [physics]/Materials - Abstract
International audience; In this paper, we present the results of numerical micromagnetic modelling of the domain wall pinning on non-magnetic defects in a ferromagnetic thin sheet of permalloy. We compared the influence of different distribution of non-magnetic inclusions on the magnetization reversal in case of uniaxial anisotropy. It is shown that the non-magnetic defects help to resolve vortex singularities and play a role of pinning states. It is demonstrated that the defects located on the sides of the sheet favor the transition into the single-domain state. By varying the in-plane anisotropy constant, we observed that the defects located in the center lead to higher coercivity, when the domain wall width is comparable to the size of the sample, but narrowing of domain wall width leads to a change of energetically favorable distribution of defects and the highest is when defects are located on the sides. It is shown that the defects located in the corner of the sheet serve as nucleation points for the magnetization reversal process and have a lower threshold for unpinning of the domain walls.