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

W. Hübner·K. H. Bennemann
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Abstract

The spin-lattice relaxation time $τ_{SL}$ 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 $τ_{SL}$ 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 $τ_{SL}$ in metals is essentially given by the spin-orbit induced magnetocrystalline anisotropy energy.

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W. Hübner, K. H. Bennemann. 1995-08-25. Simple theory for spin-lattice relaxation in metallic rare earth ferromagnets. https://doi.org/10.1103/physrevb.53.3422

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