プレナーホール整流効果を用いた人工磁性体の非線形応答の検出

概要

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We have investigated the dynamics of a vortex core trapped in a single layered Fe19Ni18 disk. The large amplitude excitation of the vortex core translational mode causes a shift in the resonance frequency. We can explainthe self-bistable mode where the position and amplitude of a dynamic vortex core determines the translational mode effect on the dynamic change of the gradient of the potential well. The phenomenological model that describes the self-bistability also provides an explanation for the asymmetrical spectrum shape. The self-bistability to tune the resonance using the input current would be extremely useful for high-frequency devices. This work also opens up a rich new area of study in the field of nano-scale magnets.
社団法人　日本磁気学会の論文