Decoherence of Transverse Spin Current in Ferrimagnetic Alloys

2020 
It has been predicted that transverse spin current can propagate coherently over a long distance in antiferromagnetically ordered metals. Here, we determine the coherence length $\lambda_c$ of transverse spin current in ferrimagnetic CoGd alloys across magnetic compensation. Spin pumping measurements reveal that nearly compensated CoGd spin sinks exhibit $\lambda_c \approx 4$ nm, approximately a factor of 3-4 greater than $\lambda_c$ for ferromagnetic metals. Our results confirm partial mitigation of spin dephasing in antiferromagnetically ordered metals, analogous to spin echo rephasing for nuclear and qubit spin systems.
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