In in-plane ferromagnetic spin valves, parallel-to-antiparallel all-optical switching occurs only with a cobalt reference layer, because its rapid remagnetization generates the negative spin current needed to reverse the free layer.
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Exploring Co, Fe, and Ni Reference Layers for Single-Pulse All-Optical Reversal in Ferromagnetic Spin Valves
In in-plane ferromagnetic spin valves, parallel-to-antiparallel all-optical switching occurs only with a cobalt reference layer, because its rapid remagnetization generates the negative spin current needed to reverse the free layer.