Absorption of transverse spin current in ferromagnetic NiCu: Dominance of bulk dephasing over spin-flip scattering

Author:

Lim Youngmin1ORCID,Wu Shuang1ORCID,Smith David A.1ORCID,Klewe Christoph2,Shafer Padraic2ORCID,Emori Satoru1ORCID

Affiliation:

1. Department of Physics, Virginia Tech, Blacksburg, Virginia 24060, USA

2. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

Abstract

In ferromagnetic metals, transverse spin currents are thought to be absorbed via dephasing—i.e., destructive interference of spins precessing about the strong exchange field. Yet, due to the ultrashort coherence length of ≈1 nm in typical ferromagnetic thin films, it is difficult to distinguish dephasing in the bulk from spin-flip scattering at the interface. Here, to assess which mechanism dominates, we examine transverse spin-current absorption in ferromagnetic NiCu alloy films with reduced exchange fields. We observe that the coherence length increases with decreasing Curie temperature, as weaker dephasing in the film bulk slows down spin absorption. Moreover, nonmagnetic Cu impurities do not diminish the efficiency of spin-transfer torque from the absorbed spin current. Our findings affirm that the transverse spin current is predominantly absorbed by dephasing inside the nanometer-thick ferromagnetic metals, even with high impurity contents.

Funder

Air Force Office of Scientific Research

Division of Materials Research

U.S. Department of Energy

Publisher

AIP Publishing

Subject

Physics and Astronomy (miscellaneous)

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