1. Linear stochastic magnetization dynamics and microscopic relaxation mechanisms.
- Author
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Safonov, Vladimir L. and Bertram, H. Neal
- Subjects
- *
DAMPING (Mechanics) , *STOCHASTIC differential equations - Abstract
Linear magnetization dynamics with relaxation and noise from a thermal bath is analyzed for two general classes of microscopic damping mechanisms. The resulting stochastic differential equations are always in the form of a damped harmonic oscillator driven by a thermal field. Backtransformation from the oscillator coordinates to the magnetization variables always results in a stochastic Bloch-Bloembergen equation for the transverse magnetization components. Detailed evaluation of relaxation rates for the magnon-electron confluence process and the slow-relaxing impurity process is given. Using experimentally observed parameters, a combination of these two processes show good agreement for a set of ferromagnetic resonance linewidth measurements versus temperature, frequency, and film thickness in NiFe. [ABSTRACT FROM AUTHOR]
- Published
- 2003
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