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

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arxiv 1405.4775 v1 pith:65IKDB5H submitted 2014-05-19 cond-mat.mtrl-sci cond-mat.mes-hall

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

Chunhui Du , Hailong Wang , Fengyuan Yang , P. Chris Hammel This is my paper
classification cond-mat.mtrl-sci cond-mat.mes-hall
keywords spiny3fe5o12conductanceconductancescurrentefficiencyheterostructuresinsertion
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Spin transport efficiency in heterostructures depends on the spin conductances of each constituent and their interfaces. We report a comparative study of spin pumping in Y3Fe5O12/Cu/Pt and Y3Fe5O12/Cu/W trilayers. Surprisingly, the insertion of a Cu interlayer between Y3Fe5O12 and W substantially improves (over a factor of 4) the spin current injection into W while similar insertion between Y3Fe5O12 and Pt degrades the spin current. This is a consequence of a much improved Y3Fe5O12/Cu spin mixing conductance relative to that for Y3Fe5O12/W. This result implies the possibility of engineered heterostructures with matching spin conductances to enable optimal spin transport efficiency.

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