4.6 Article

Enhanced unidirectional spin Hall magnetoresistance in a Pt/Co system with a Cu interlayer

Journal

PHYSICAL REVIEW B
Volume 103, Issue 2, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.103.L020411

Keywords

-

Funding

  1. JSPS KAKENHI [19J21938, 19H00860]
  2. Spintronics Research Network of Japan
  3. Dynamic Alliance for Open Innovation Bridging Human, Environment and Materials from the Ministry of Education, Culture, Sports, Science, and Technology of Japan (MEXT)
  4. Grants-in-Aid for Scientific Research [19H00860, 19J21938] Funding Source: KAKEN

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The study found that inserting a thin Cu interlayer into the Pt/Co interface can enhance USMR, where the Cu/Co system exhibits a large GMR. Experimental results show that the spin current injection into the Co layer is not modulated by the Cu interlayer, and USMR increases with Cu thickness, reaching a peak before decreasing.
Spin-dependent scattering at the nonmagnet/ferromagnet interface plays a key role in determining the amplitude of unidirectional spin Hall magnetoresistance (USMR), similar to giant magnetoresistance (GMR). We report the enhancement of USMR by inserting a thin Cu interlayer into the Pt/Co interface, where the Cu/Co system is well known to exhibit a large GMR. A measurement of the spin-orbit torque shows that the spin current injection into the Co layer is not modulated by the Cu interlayer. In addition, USMR increases with the Cu thickness for the ultrathin regime as the Cu/Co interface is formed, reaching a peak before decreasing, owing to the shunting effect. Our results suggest an interfacial origin of the enhanced USMR and highlight the close similarities between USMR and GMR.

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