Micromagnetism of MnBi:FeCo thin films. (28th January 2016)

• Record Type: Journal Article
• Authors: 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
• Is Part Of: Journal of physics. Volume 49:Number 7(2016)
• Publication Date: 2016-01-28
• Subjects: exchanged coupled hard-soft bilayer -- micromagnetic -- periodic boundary condition -- coercivity -- hysteresis loop; Physics -- Periodicals; 530
• DOI: 10.1088/0022-3727/49/7/075003
• Languages: English
• ISSNs: 0022-3727

Abstract

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.