Variable spin-charge conversion across metal-insulator transition

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 stru...

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Bibliographic Details
Published in:Nature communications 2020-01, Vol.11 (1), p.476-476, Article 476
Main Authors: Safi, Taqiyyah S., Zhang, Pengxiang, Fan, Yabin, Guo, Zhongxun, Han, Jiahao, Rosenberg, Ethan R., Ross, Caroline, Tserkovnyak, Yaraslov, Liu, Luqiao
Format: Article
Language:English
Subjects:
639/301/119/1001
639/301/119/997
639/766/119/2795
639/766/119/995
Charge efficiency
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Conversion
Correlation
Efficiency
Electrical properties
ENGINEERING
Ferromagnetic resonance
Ferromagnetism
Hall effect
Humanities and Social Sciences
Insulators
MATERIALS SCIENCE
Metal-insulator transition
Metals
multidisciplinary
Organic chemistry
Phase transitions
Pumping
Science
Science (multidisciplinary)
Vanadium
Vanadium compounds
Vanadium dioxide
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Summary: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 (VO 2 ). 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. The interconversion of spin and charge is fundamental to the operation of spintronic devices. Here the authors demonstrate spin-to-charge conversion in the correlated material vanadium dioxide, and show that the efficiency changes dramatically across the metal-insulator transition.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-020-14388-9