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Linear stochastic magnetization dynamics and microscopic relaxation mechanisms.
- Source :
-
Journal of Applied Physics . 7/1/2003, Vol. 94 Issue 1, p529. 10p. 1 Diagram, 3 Graphs. - Publication Year :
- 2003
-
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]
- Subjects :
- *DAMPING (Mechanics)
*STOCHASTIC differential equations
Subjects
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 94
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 10070994
- Full Text :
- https://doi.org/10.1063/1.1581349