Fluctuations of the Magnetization in Thin Films due to Conduction Electrons

Details Fluctuations of the Magnetization in Thin Films due to Conduction Electrons Fluctuations of the Magnetization in Thin Films due to Conduction Electrons

2004-12-18

arxiv.org/abs/cond-mat/0412510v1

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevB.71.174415

A detailed analysis of damping and noise due to a {\it sd}-interaction in a thin ferromagnetic film sandwiched between two large normal metal layers is carried out. The magnetization is shown to obey in general a non-local equation of motion which differs from the the Gilbert equation and is extended to the non-adiabatic regime. To lowest order in the exchange interaction and in the limit where the Gilbert equation applies, we show that the damping term is enhanced due to interfacial effects but it also shows oscillations as a function of the film thickness. The noise calculation is however carried out to all orders in the exchange coupling constant. The ellipticity of the precession of the magnetization is taken into account. The damping is shown to have a Gilbert form only in the adiabatic limit while the relaxation time becomes strongly dependent on the geometry of the thin film. It is also shown that the induced noise characteristic of sd-exchange is inherently colored in character and depends on the symmetry of the Hamiltonian of the magnetization in the film. We show that the sd-noise can be represented in terms of an external stochastic field which is white only in the adiabatic regime. The temperature is also renormalized by the spin accumulation in the system. For large intra-atomic exchange interactions, the Gilbert-Brown equation is no longer valid.

Affiliated with

Also associated with

No associations

Rating

Fluctuations of the Magnetization in Thin Films due to Conduction Electrons does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Fluctuations of the Magnetization in Thin Films due to Conduction Electrons, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fluctuations of the Magnetization in Thin Films due to Conduction Electrons will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-16712