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Spin transport efficiency in heterostructures depends on the spinconductances of each constituent and their interfaces. We report a comparativestudy of spin pumping in Y3Fe5O12/Cu/Pt and Y3Fe5O12/Cu/W trilayers.Surprisingly, the insertion of a Cu interlayer between Y3Fe5O12 and Wsubstantially improves (over a factor of 4) the spin current injection into Wwhile similar insertion between Y3Fe5O12 and Pt degrades the spin current. Thisis a consequence of a much improved Y3Fe5O12/Cu spin mixing conductancerelative to that for Y3Fe5O12/W. This result implies the possibility ofengineered heterostructures with matching spin conductances to enable optimalspin transport efficiency.

Enhancement of Pure Spin Currents in Spin Pumping Y3Fe5O12/Cu/metal Trilayers through Spin Conductance Matching