Suppression of spin pumping at metal interfaces
Source abstract
Abstract
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.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Magnetic properties of thin films · Quantum and electron transport phenomena · Ferroelectric and Negative Capacitance Devices
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Physics, Virginia Tech 1 , Blacksburg, Virginia 24061, USA
Department of Physics and Astronomy, The University of Alabama 2 , Tuscaloosa, Alabama 35487, USA
Department of Materials Science and Engineering, Virginia Tech 3 , Blacksburg, Virginia 24061, USA
Advanced Light Source, Lawrence Berkeley National Laboratory 4 , Berkeley, California 94720, USA
Department of Physics, Indiana University - Purdue University Indianapolis 5 , Indianapolis, Indiana 46202, USA
Funding
Division of Materials Research · Office of Advanced Cyberinfrastructure · Basic Energy Sciences · Office of Science · Institute for Critical Technologies and Applied Science, Virginia Tech · Macromolecules Innovation Institute · Office of the Vice President for Research and Innovation
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