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Multistable switching due to magnetic vortices pinned at artificial pinning sites

2004; American Institute of Physics; Volume: 85; Issue: 9 Linguagem: Inglês

10.1063/1.1785281

1520-8842

M. Rahm, Joachim Stahl, W. Wegscheider, D. Weiß,

Magnetic Properties and Applications

Magnetic vortices form the ground state in micron and submicron ferromagnetic disks. By inserting artificial defects (antidots) into a submicron ferromagnetic disk, magnetic vortices can be pinned controllably thus enabling a different way for magnetic switching. We show that by inserting n antidots into a disk magnetization reversal takes place via n-1 jumps of the vortex core between neighboring antidots. This cannot only be used to establish stable two-state switching for n=2, but also to realize a multilevel remanent state with low switching fields.