Anomalous reversal of transverse thermoelectric voltage in CoδFe100-δ/YIG junction

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:447

Article

Ramos, R.¹  Wongjom, P.²  Iguchi, R.^3,4  Yagmur, A.^3,4  Qiu, Z.¹  Pinitsoontorn, S.²  Uchida, K.^3,4,5,6  Saitoh, E.^1,3,6,7 

[1] Tohoku Univ, Adv Inst Mat Res, Sendai, Miyagi 9808577, Japan

[2] Khon Kaen Univ, Fac Sci, Integrated Nanotechnol Res Ctr, Dept Phys, Khon Kaen 40002, Thailand

[3] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[4] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan

[5] Japan Sci & Technol Agcy, PRESTO, Kawaguchi, Saitama 3320012, Japan

[6] Tohoku Univ, Ctr Spintron Res Network, Sendai, Miyagi 9808577, Japan

[7] Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan

关键词: Spintronics;    Spin caloritronics;    Spin Seebeck effect;    Anomalous Nernst effect;   

DOI  :  10.1016/j.jmmm.2017.09.034

来源: Elsevier

【 摘 要 】

We have studied thermoelectric conversion in all-ferromagnetic Co delta Fe100-delta/YlG bilayer junctions as a function of the chemical composition delta. We performed measurements of the transverse thermoelectric voltage upon application of a magnetic field. The voltage measured in the longitudinal spin Seebeck effect configuration shows a sign reversal at delta = 40%, which cannot be explained by the conventional electronic transport, such as the anomalous Nernst and Hall effects in the Co delta Fe100-delta layer. Our results suggest a possible role of the sd-type exchange interaction between Co40Fe60 and YIG at the interface as a possible origin for the observed behavior. (c) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

Free