Micromagnetism of MnBi:FeCo thin films

T. H. Rana, P. Manchanda, B. Balamurugan, A. Kashyap, T. R. Gao, I. Takeuchi, J. Cun, S. Biswas, R. F. Sabirianov, D. J. Sellmyer, R. Skomski

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

MnBi:FeCo hard-soft bilayers are investigated using micromagnetic simulations with open boundary conditions and two-dimensional (2D) periodic boundary conditions (PBC). Open and PBC yield similar coercivities of about 1.01 T, in agreement with experiment, but the hysteresis-loop shape is very different in the two theoretical approaches. The difference is ascribed to edge effects, which occur in open boundary conditions but not in PBC and experiment. Near the nucleation field, a curling or vortex mode develops in dots with circular cross sections. The curling mode, which is caused by magnetostatic self-interaction, does not negatively affect the high coercivity of 1.01 T. The magnetostatic self-interaction contributes to the favorable second-quadrant behavior of the MnBi:FeCo thin films.

Original languageEnglish (US)
Article number075003
JournalJournal of Physics D: Applied Physics
Volume49
Issue number7
DOIs
StatePublished - Jan 28 2016

Keywords

  • coercivity
  • exchanged coupled hard-soft bilayer
  • hysteresis loop
  • micromagnetic
  • periodic boundary condition

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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    Rana, T. H., Manchanda, P., Balamurugan, B., Kashyap, A., Gao, T. R., Takeuchi, I., Cun, J., Biswas, S., Sabirianov, R. F., Sellmyer, D. J., & Skomski, R. (2016). Micromagnetism of MnBi:FeCo thin films. Journal of Physics D: Applied Physics, 49(7), [075003]. https://doi.org/10.1088/0022-3727/49/7/075003