Absence of Significant Spin-Current Generation in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><mml:mi>Ti</mml:mi><mml:mo>/</mml:mo><mml:mi>Fe</mml:mi><mml:mtext>−</mml:mtext><mml:mi>Co</mml:mi><mml:mtext>−</mml:mtext><mml:mrow><mml:mrow><mml:mi mathvariant="normal">B</mml:mi></mml:mrow></mml:mrow></mml:math> Bilayers with Strong Interfacial Spin-Orbit Coupling

Abstract

Efficient generation of spin current is fundamental in spintronics. Despite a decade and more of intense research interest, whether the spin-orbit coupling (SOC) effects of magnetic interfaces can effectively generate a spin current remains an open question. Utilizing Ti/Fe-Co-B bilayers with negligible bulk spin Hall effect and strong, tunable interfacial SOC, the authors establish clean experimental evidence that magnetic interfaces $d\phantom{\rule{0}{0ex}}o$ $n\phantom{\rule{0}{0ex}}o\phantom{\rule{0}{0ex}}t$ generate any significant spin current via spin-orbit filtering or Rashba-Edelstein-like) effects.

Topics & Concepts