Observation of temperature-gradient-induced magnetization

Journal article (2016)

Authors

Dazhi Hou Japan Science and Technology Agency, Tohoku University
Zhiyong Qiu Japan Science and Technology Agency, Tohoku University
Ryo Iguchi Tohoku University
K Sato Tohoku University
E. K. Vehstedt Tohoku University, University College London
Ken Ichi Uchida Tohoku University, Japan Science and Technology Agency
G.E. Bauer Kavli institute of nanoscience Delft, Tohoku University, QN/Bauer Group - AS
Eiji Saitoh Japan Atomic Energy Agency, Tohoku University, Japan Science and Technology Agency
Research Group
QN/Bauer Group (AS) (TU Delft)
Copyright: © 2016 Dazhi Hou, Zhiyong Qiu, R. Iguchi, K. Sato, E. K. Vehstedt, K. Uchida, G.E. Bauer, E. Saitoh
DOI: https://doi.org/10.1038/ncomms12265
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Published Date

26-07-2016

Language

English

Faculty

Applied Sciences

Department

QN/Quantum Nanoscience

Research Group

QN/Bauer Group

Abstract

Applying magnetic fields has been the method of choice to magnetize non-magnetic materials, but they are difficult to focus. The magneto-electric effect and voltage-induced magnetization generate magnetization by applied electric fields, but only in special compounds or heterostructures. Here we demonstrate that a simple metal such as gold can be magnetized by a temperature gradient or magnetic resonance when in contact with a magnetic insulator by observing an anomalous Hall-like effect, which directly proves the breakdown of time-reversal symmetry. Such Hall measurements give experimental access to the spectral spin Hall conductance of the host metal, which is closely related to other spin caloritronics phenomena such as the spin Nernst effect and serves as a reference for theoretical calculation.