Journal
JOURNAL OF APPLIED PHYSICS
Volume 116, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4889848
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Funding
- Spanish Government [MAT2011-28532-C03-01]
- Junta de Castilla y Leon [SA163A12]
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The nucleation of domain walls in ultrathin ferromagnetic/heavy-metal bilayers is studied by means of micromagnetic simulations. In the presence of interfacial Dzyaloshinskii-Moriya interaction, the nucleated walls naturally adopt a homochiral configuration with internal magnetization pointing antiparallely. The interaction between these walls was analyzed and described in terms of a classical dipolar force between the magnetic moments of the walls, which couples their dynamics. Additionally, the current-induced motion of two homochiral walls in the presence of longitudinal fields was also studied by means of a simple one-dimensional model and micromagnetic modeling, considering both one free-defect strip and another one with random edge roughness. It is evidenced that in the presence of pinning due to edge roughness, the in-plane longitudinal field introduces an asymmetry in the current-induced depinning, in agreement with recent experimental results. (C) 2014 AIP Publishing LLC.
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