Simple theory for spin-lattice relaxation in metallic rare earth ferromagnets

Details Simple theory for spin-lattice relaxation in metallic rare earth ferromagnets Simple theory for spin-lattice relaxation in metallic rare earth ferromagnets

1995-08-25

arxiv.org/abs/cond-mat/9508120v1

Physics

Condensed Matter

18 pages revtex, 5 uuencoded figures

Scientific paper

10.1103/PhysRevB.53.3422

The spin-lattice relaxation time $\tau_{SL}$ is a key quantity both for the dynamical response of ferromagnets excited by laser pulses and as the speed limit of magneto-optical recording. Extending the theory for the electron paramagnetic resonance of magnetic impurities to spin-lattice relaxation in ferromagnetic rare earths we calculate $\tau_{SL}$ for Gd and find a value of 48 ps in very good agreement with time-resolved spin-polarized photoemission experiments. We argue that the time scale for $\tau_{SL}$ in metals is essentially given by the spin-orbit induced magnetocrystalline anisotropy energy.

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