Separation of longitudinal spin Seebeck effect from anomalous Nernst effect: Determination of origin of transverse thermoelectric voltage in metal/insulator junctions

T. Kikkawa, K. Uchida, S. Daimon, Y. Shiomi, H. Adachi, Z. Qiu, D. Hou, X.-F. Jin, S. Maekawa, and E. Saitoh
Phys. Rev. B 88, 214403 – Published 6 December 2013

Abstract

The longitudinal spin Seebeck effect (LSSE) and the anomalous Nernst effect (ANE) are investigated in various metal/insulator junction systems and a clear separation of the LSSE from the ANE induced by static magnetic proximity is demonstrated. This separation is realized by comparing transverse thermoelectric voltage in in-plane magnetized (IM) and perpendicularly magnetized (PM) configurations, where the LSSE appears only in the IM configuration while the ANE appears both in the IM and PM configurations. We show that, in Pt/Y3Fe5O12 samples, the LSSE voltage in the IM configuration is three orders of magnitude greater than the proximity-ANE contamination estimated from the data in the PM configuration. This quantitative voltage comparison between the IM and PM configurations is corroborated by systematic voltage measurements in Ni81Fe19/Gd3Ga5O12, Pt/Gd3Ga5O12, Au/Y3Fe5O12, and Au/Gd3Ga5O12 samples and by our phenomenological model calculation. The LSSE measurements in high magnetic field regions further confirm that the observed voltage in the Pt/Y3Fe5O12 and Au/Y3Fe5O12 samples is of magnon origin. We apply this voltage comparison method also to a Ni81Fe19/Y3Fe5O12 sample and show that both the LSSE and ANE exist in this sample.

  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
  • Figure
2 More
  • Received 21 September 2013

DOI:https://doi.org/10.1103/PhysRevB.88.214403

©2013 American Physical Society

Authors & Affiliations

T. Kikkawa1, K. Uchida1,2,*, S. Daimon1, Y. Shiomi1, H. Adachi3,4, Z. Qiu5, D. Hou5, X.-F. Jin6, S. Maekawa3,4, and E. Saitoh1,3,4,5

  • 1Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
  • 2PRESTO, Japan Science and Technology Agency, Saitama 332-0012, Japan
  • 3Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan
  • 4CREST, Japan Science and Technology Agency, Tokyo 102-0076, Japan
  • 5WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
  • 6State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China

  • *kuchida@imr.tohoku.ac.jp

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 88, Iss. 21 — 1 December 2013

Reuse & Permissions
Access Options
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×