磁気渦コア反転における磁気渦構造の安定性

抄録

  The stability of the vortex structure on vortex core switching was investigated by using micromagnetic simulation. The method by the vortex core switching simulation by AC spin current is used to investigate this. Furthermore, the adequacy of the result was investigated by the evaluation of the magnetic energy. The switching simulation revealed that the vortex core did not switch around the transition dimension of magnetic disks between single-domain structure and the vortex structure in a remanent state, and the disk diameter needed to be increased to about 20 to 80 nm for stable vortex core switching compared with the stability limit in the remanent state. Furthermore, the results we obtained from our evaluation of magnetic energy agreed with the results obtained by simulating vortex core switching. Therefore, the result of the core switching simulation is also assured by the evaluation of magnetic energy.