Journal
PHYSICAL REVIEW B
Volume 79, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.224427
Keywords
ferromagnetic materials; high-frequency effects; magnetic domain walls; magnetic moments; magnetic switching; magnetisation reversal; nucleation; Permalloy; spin dynamics
Funding
- European Commission [HPRN-CT-200200318]
- European COST-P19 Action and Spanish National Projects [MAT2007-66719-C03-01, CS2008-023]
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The microwave-assisted magnetization reversal is modeled in a permalloy micron-sized magnetic ellipsoid. Our simulations confirm that this process requires less field than magnetization reversal under a static field. This is due to a different reversal mode which in the case of the microwave-assisted process is always a ripple structure. During the magnetization reversal, two stages, nucleation and relaxation, are distinguished. The nucleation process is governed by spin-wave instabilities. The relaxation process is related to the domain expansion through domain-wall propagation determined by the precessional motion of magnetic moments in the center of the domain walls. As a consequence, the switching time is a complex oscillating function of the microwave frequency.
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