2009/06/01 by R. Yanes, R. Rozada, Felipe García‐Sánchez +7 · 15 citations
Materials Science · Physics and Astronomy · #Condensed matter physics #Domain wall (magnetism) #Ellipsoid #Hysteresis #Magnetic Properties and Applications #Magnetic domain #Magnetic field #Magnetic properties of thin films #Magnetization #Magnetization dynamics #Materials science #Micromagnetics #Microwave #Nucleation #Permalloy #Physics #Relaxation (psychology) #Single domain #Theoretical and Computational Physics #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.79.224427
published in Physical Review B 79(22) (American Physical Society)
arxiv created 2009/06/01 · openalex publication_date 2009/06/24 · arxiv updated 2015/05/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.