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An electrically conductive metal typically transmits or absorbs a spincurrent. Here, we report on evidence that interfacing two metal thin films cansuppress spin transmission and absorption. We examine spin pumping inferromagnet/spacer/ferromagnet heterostructures, in which the spacer --consisting of metallic Cu and Cr thin films -- separates the ferromagneticspin-source and spin-sink layers. The Cu/Cr spacer largely suppresses spinpumping -- i.e., neither transmitting nor absorbing a significant amount ofspin current -- even though Cu or Cr alone transmits a sizable spin current.The antiferromagnetism of Cr is not essential for the suppression of spinpumping, as we observe similar suppression with Cu/V spacers where V is anonmagnetic analogue of Cr. We speculate that diverse combinations ofspin-transparent metals may form interfaces that suppress spin pumping,although the underlying mechanism remains unclear. Our work may stimulate a newperspective on understanding and engineering spin transport in metallicmultilayers.

Suppression of Spin Pumping at Metal Interfaces