Dephasing of Transverse Spin Current in Ferrimagnetic Alloys.
2020
It has been predicted that transverse spin current can propagate coherently (without dephasing) over a long distance in antiferromagnetically ordered metals. Here, we determine the dephasing length of transverse spin current in ferrimagnetic CoGd alloys by spin pumping measurements. A modified drift-diffusion model, which accounts for spin-current transmission through the ferrimagnet, reveals a dephasing length in nearly compensated CoGd that is about 4-5 times longer than that in 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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