Nonlinear vortex dynamics and transient domains in ferromagnetic disks

作者：Cheng X M^*; Buchanan K S; Divan R; Guslienko K Y; Keavney D J

来源：Physical Review B, 2009, 79(17): 172411.

DOI：10.1103/PhysRevB.79.172411

• iron alloys
• magnetic relaxation
• magnetisation
• micromagnetics
• nickel alloys
• photoelectron microscopy
• polarisation
• vortices

We report a time-resolved imaging and micromagnetic simulation study of the relaxation dynamics of a magnetic vortex in the nonlinear regime. We use time-resolved photoemission electron microscopy and micromagnetic calculations to examine the emergence of nonlinear vortex dynamics in patterned Ni(80)Fe(20) disks in the limit of long field pulses. We show for core shifts beyond similar to 20%-25% of the disk radius, the initial motion is characterized by distortions of the vortex, a transient cross-tie wall state, and instabilities in the core polarization that influence the core trajectories.

• 出版日期2009-5