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"Spin pumping" is the injection of spin angular momentum by a time-dependentmagnetization into an adjacent normal metal proportional to the spin mixingconductance. We study the role of electrostatic interactions in the form ofcrystal fields on the pumped spin currents generated by insulators withexchange-coupled local moments at the interface to a metal. The crystal fieldis shown to render the spin currents anisotropic, which implies that the spinmixing conductance of insulator|normal metal bilayers depends on crystal cutand orientation. We interpret the interface "effective field" (imaginary partof the spin mixing conductance) in terms of the coherent motion of theequilibrium spin density induced by proximity in the normal metal.

Crystal field effects on spin pumping