Cited 19 time in webofscience Cited 21 time in scopus

Voltage tuning of thermal spin current in ferromagnetic tunnel contacts to semiconductors

Title
Voltage tuning of thermal spin current in ferromagnetic tunnel contacts to semiconductors
Authors
Jeon, KR[Jeon, Kun-Rok]Min, BC[Min, Byoung-Chul]Spiesser, A[Spiesser, Aurelie]Saito, H[Saito, Hidekazu]Shin, SC[Shin, Sung-Chul]Yuasa, S[Yuasa, Shinji]Jansen, R[Jansen, Ron]
DGIST Authors
Shin, SC[Shin, Sung-Chul]
Issue Date
2014-04
Citation
Nature Materials, 13(4), 360-366
Type
Article
Article Type
Article
Keywords
Ferromagnetic ElementsFerromagnetic MaterialsFerromagnetismMagnetic TunnelsMaterial DesignsMicrowave DevicesNon-Magnetic MaterialsThermo-Electric ParametersThermo-Electric PropertiesTunnel ContactsVoltage Tuning
ISSN
1476-1122
Abstract
Spin currents are paramount to manipulate the magnetization of ferromagnetic elements in spin-based memory, logic and microwave devices, and to induce spin polarization in non-magnetic materials. A unique approach to create spin currents employs thermal gradients and heat flow. Here we demonstrate that a thermal spin current can be tuned conveniently by a voltage. In magnetic tunnel contacts to semiconductors (silicon and germanium), it is shown that a modest voltage (∼200 mV) changes the thermal spin current induced by Seebeck spin tunnelling by a factor of five, because it modifies the relevant tunnelling states and thereby the spin-dependent thermoelectric parameters. The magnitude and direction of the spin current is also modulated by combining electrical and thermal spin currents with equal or opposite sign. The results demonstrate that spin-dependent thermoelectric properties away from the Fermi energy are accessible, and open the way towards tailoring thermal spin currents and torques by voltage, rather than material design. © 2014 Macmillan Publishers Limited. All rights reserved.
URI
http://hdl.handle.net/20.500.11750/2394
DOI
10.1038/NMAT3869
Publisher
Nature Publishing Group
Files:
There are no files associated with this item.
Collection:
Emerging Materials ScienceETC1. Journal Articles


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