Abstract

Electric generation of spin current via spin Hall effect is of great interest as it allows an efficient manipulation of magnetization in spintronic devices. Theoretically, pure spin current can be also created by a temperature gradient, which is known as spin Nernst effect. Here, we report spin Nernst effect-induced transverse magnetoresistance in ferromagnet/non-magnetic heavy metal bilayers. We observe that the magnitude of transverse magnetoresistance in the bilayers is significantly modified by heavy metal and its thickness. This strong dependence of transverse magnetoresistance on heavy metal evidences the generation of thermally induced pure spin current in heavy metal. Our analysis shows that spin Nernst angles of W and Pt have the opposite sign to their spin Hall angles. Moreover, our estimate implies that the magnitude of spin Nernst angle would be comparable to that of spin Hall angle, suggesting an efficient generation of spin current by the spin Nernst effect.

Details

Title
Observation of transverse spin Nernst magnetoresistance induced by thermal spin current in ferromagnet/non-magnet bilayers
Author
Dong-Jun, Kim 1   VIAFID ORCID Logo  ; Chul-Yeon Jeon 1 ; Choi, Jong-Guk 1 ; Lee, Jae Wook 1 ; Srivathsava Surabhi 2 ; Jong-Ryul Jeong 2 ; Kyung-Jin, Lee 3   VIAFID ORCID Logo  ; Park, Byong-Guk 1   VIAFID ORCID Logo 

 Department of Materials Science and Engineering and KI for Nanocentury, KAIST, Daejeon, Korea 
 Department of Materials Science and Engineering, Graduate School of Energy Science Technology, Chungnam National University, Daejeon, Korea 
 Department of Materials Science and Engineering, Korea University, Seoul, Korea; KU-KIST Graduate School of Converging Science and Technology, Korea University, Seoul, Korea 
Pages
1-6
Publication year
2017
Publication date
Nov 2017
Publisher
Nature Publishing Group
e-ISSN
20411723
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
1962258917
Copyright
© 2017. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.