• Bedanta, Subhankar
• Azevedo, Antonio
• Gupta, Pushpendra
• Nayak, Sagarika
• Mishra, Abhisek

Abstract

<jats:title>Abstract</jats:title><jats:p>Switching magnetization with spin current via spin orbital torque is a novel approach towards energy-efficient spintronics. In this regard, high spin–orbit coupling materials such as heavy metals are required to create the spin current via spin Hall effect. In recent times, a lot of attention has been paid to replace heavy metals by antiferromagnets to be considered as a spin sink. The bimetallic antiferromagnet, Mn<jats:sub>2</jats:sub>Au has attracted interest due to its high Néel temperature (T<jats:sub><jats:italic>N</jats:italic></jats:sub> &gt; 1000 K) and high spin Hall angle. Here, we present results from experiments on spin pumping and the inverse spin Hall effect (ISHE) employing ferromagnetic resonance in Mn<jats:sub>2</jats:sub>Au/Py and Mn<jats:sub>2</jats:sub>Au/Cu/Py systems. The values of Gilbert damping constant decrease while inverse spin Hall voltage increases with the insertion of Cu spacer layer. This unusual behaviour indicates that the interface plays an important role for tuning the spintronic parameters. The maximum effective spin mixing conductance (<jats:inline-formula><jats:tex-math> <?CDATA ${g}_{{eff}}^$?> </jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:msubsup><mml:mrow><mml:mi>g</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">eff</mml:mi></mml:mrow><mml:mrow><mml:mo>↑</mml:mo><mml:mo>↓</mml:mo></mml:mrow></mml:msubsup></mml:math><jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="psacdb9fieqn1.gif" xlink:type="simple" /></jats:inline-formula>) has been evaluated to be 36.20 × 10<jats:sup>18</jats:sup> m<jats:sup>−2</jats:sup>.</jats:p>

Topics

• impedance spectroscopy
• experiment
• magnetization