Large-angle analytical solution of magnetization precession in ferromagnetic resonance
Abstract Dynamics of magnetization M driven by microwave are derived analytically from the nonlinear Landau–Lifshitz–Gilbert equation. Analytical M and susceptibility are obtained self-consistently under a positive circularly polarized microwave field, h = ( h cos ω t , h sin ω t , 0 ) , with fr...
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Published in | New journal of physics Vol. 26; no. 9; pp. 93016 - 93021 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
IOP Publishing
01.09.2024
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Subjects | |
Online Access | Get full text |
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Summary: | Abstract Dynamics of magnetization M driven by microwave are derived analytically from the nonlinear Landau–Lifshitz–Gilbert equation. Analytical M and susceptibility are obtained self-consistently under a positive circularly polarized microwave field, h = ( h cos ω t , h sin ω t , 0 ) , with frequency ω , which is perpendicular to a static field, H = ( 0 , 0 , H ) . It is found that the orbital of M is always a cone along H . However, with increasing h the polar angle θ of M initially increases, then keeps 90° when h ⩾ h 0 = α ω / γ in ferromagnetic resonance (FMR) mode, where α is Gilbert damping constant and γ is gyromagnetic ratio. These effects result in a nonlinear variation of FMR signal as h increases to h ⩾ h 0 , where the maximum of resonance peak decreases from a steady value, linewidth increases from a decreasing trend. These analytical solutions provide a complete picture of the dynamics of M with different h and H . |
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Bibliography: | NJP-117512.R1 |
ISSN: | 1367-2630 1367-2630 |
DOI: | 10.1088/1367-2630/ad7632 |