Variable spin-charge conversion across metal-insulator transition

Taqiyyah S. Safi, Pengxiang Zhang, Yabin Fan, Zhongxun Guo, Jiahao Han, Ethan R. Rosenberg, Caroline Ross, Yaraslov Tserkovnyak and Luqiao Liu ()
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Taqiyyah S. Safi: Massachusetts Institute of Technology
Pengxiang Zhang: Massachusetts Institute of Technology
Yabin Fan: Massachusetts Institute of Technology
Zhongxun Guo: Massachusetts Institute of Technology
Jiahao Han: Massachusetts Institute of Technology
Ethan R. Rosenberg: Massachusetts Institute of Technology
Caroline Ross: Massachusetts Institute of Technology
Yaraslov Tserkovnyak: University of California
Luqiao Liu: Massachusetts Institute of Technology

Nature Communications, 2020, vol. 11, issue 1, 1-6

Abstract: Abstract The charge-to-spin conversion efficiency is a crucial parameter in determining the performance of many useful spintronic materials. Usually, this conversion efficiency is predetermined by the intrinsic nature of solid-state materials, which cannot be easily modified without invoking chemical or structural changes in the underlying system. Here we report on successful modulation of charge-spin conversion efficiency via the metal-insulator transition in a quintessential strongly correlated electron compound vanadium dioxide (VO2). By employing ferromagnetic resonance driven spin pumping and the inverse spin Hall effect measurement, we find a dramatic change in the spin pumping signal (decrease by > 80%) and charge-spin conversion efficiency (increase by five times) upon insulator to metal transition. The abrupt change in the structural and electrical properties of this material therefore provides useful insights on the spin related physics in a strongly correlated material undergoing a phase transition.

Date: 2020
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DOI: 10.1038/s41467-020-14388-9

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