Sunday, August 4, 2013

1308.0203 (V. G. Baryakhtar et al.)

Exchange relaxation as the mechanism of ultrafast spin reorientation in
two-sublattice ferrimagnets

V. G. Baryakhtar, V. I. Butrim, B. A. Ivanov
In the exchange approximation, an exact solution is obtained for the sublattice magnetizations evolution in a two-sublattice ferrimagnet. Nonlinear regimes of spin dynamics are found that include both the longitudinal and precessional evolution of the sublattice magnetizations, with the account taken of the exchange relaxation. In particular, those regimes describe the spin switching observed in the GdFeCo alloy under the influence of a femtosecond laser pulse.
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