Suppression of spin pumping at metal interfaces

An electrically conductive metal typically transmits or absorbs a spin current. Here, we report on evidence that interfacing two metal thin films can suppress spin transmission and absorption. We examine spin pumping in spin-source/spacer/spin-sink heterostructures, where the spacer consists of meta...

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Veröffentlicht in:APL materials 2023-10, Vol.11 (10), p.101121-101121-13
Hauptverfasser: Lim, Youngmin, Nepal, Bhuwan, Smith, David A., Wu, Shuang, Srivastava, Abhishek, Nakarmi, Prabandha, Mewes, Claudia, Jiang, Zijian, Gupta, Adbhut, Viehland, Dwight D., Klewe, Christoph, Shafer, Padraic, Park, In Jun, Mabe, Timothy, Amin, Vivek P., Heremans, Jean J., Mewes, Tim, Emori, Satoru
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Sprache:eng
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Zusammenfassung:An electrically conductive metal typically transmits or absorbs a spin current. Here, we report on evidence that interfacing two metal thin films can suppress spin transmission and absorption. We examine spin pumping in spin-source/spacer/spin-sink heterostructures, where the spacer consists of metallic Cu and Cr thin films. The Cu/Cr spacer largely suppresses spin pumping—i.e., neither transmitting nor absorbing a significant amount of spin current—even though Cu or Cr alone transmits a sizable spin current. The antiferromagnetism of Cr is not essential for the suppression of spin pumping, as we observe similar suppression with Cu/V spacers with V as a nonmagnetic analog of Cr. We speculate that diverse combinations of spin-transparent metals may form interfaces that suppress spin pumping, although the underlying mechanism remains unclear. Our work may stimulate a new perspective on spin transport in metallic multilayers.
ISSN:2166-532X
2166-532X
DOI:10.1063/5.0156429