Abstract
Understanding of magnetization reversal mode plays an important role in spintronic devices performance. Especially in Heat Assisted Magnetic Recording, the contribution of thermal field in the magnetization dynamics becomes a crucial aspect which should be further explored. In this paper, Landau Lifshift-Gilbert equation was employed to investigate the magnetic switching dynamics for nano-dots with different magnetic anisotropies. This micromagnetic study shows that these nano-dots exhibit the different mode of switching. Multi-domain configuration dictates the switching process for nano-dot with strong magnetic anisotropy before magnetized in the driven magnetic field direction. Meanwhile, multi-domain configuration, domain-wall nucleation, and propagation take place in the process to achieve magnetized single-domain for the nano-dot with the lower level of magnetic anisotropy. Furthermore, in the absence of the external magnetic field, magnetic moments of this low magnetic anisotropies nano-dot is more probably to reverse.
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