Angle Resolved Relaxation of Spin Currents by Antiferromagnets in Spin Valves
Peer reviewed, Journal article
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Original versionPhysical Review Letters. 2019, 123 247201-?. 10.1103/PhysRevLett.123.247201
We observe and analyze tunable relaxation of a pure spin current by an antiferromagnet in spin valves. This is achieved by carefully controlling the angle between a resonantly excited ferromagnetic layer pumping the spin current and the Néel vector of the antiferromagnetic layer. The effect is observed as an angle-dependent spin-pumping contribution to the ferromagnetic resonance linewidth. An interplay between spin-mixing conductance and, often disregarded, longitudinal spin conductance is found to underlie our observations, which is in agreement with a recent prediction for related ferromagnetic spin valves.