Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session G60: Poster Session I
Tuesday, March 6, 2018
LACC Room: West Hall A
Abstract: G60.00182 : Anomalous Nernst effect in Ir22Mn78/Co20Fe60B20/MgO layers with perpendicular magnetic anisotropy*
(Hong Kong University Science & Technology)
(Department of Physics)
Kang L Wang
(University of California, Los Angeles)
(Institute of Physics, Ecole Polytec Fed De Lausanne)
The anomalous Nernst effect in perpendicularly magnetized Ir22Mn78/Co20Fe60B20/MgO thin film is measured using well-defined in-plane temperature gradients.The geometry with out-of-plane magnetic field and in-plane temperature gradient is the natural configuration to avoid longitudinal spin Seebeck effect and allow a precise determination of the temperature gradient. The anomalous Nernst coefficient reaches 1.8 µV/K at room temperature, which is almost 50 times larger than that of Ta/Co20Fe60B20/MgO thin film with perpendicular magnetic anisotropy. The anomalous Nernst and anomalous Hall results in different sample structures reveal that the large Nernst coefficient of Ir22Mn78/Co20Fe60B20/MgO thin film is related to the interface between CoFeB and IrMn. Finally, we point out a possible application of ANE that takes advantage of the perpendicular magnetization to obtain large Nernst voltage, owing to the in-plane geometry of the device.
*This work was supported by National Science Foundation China under Grant Nos. 11674020, by SSSTC Grant No. EG 01-032015 and EG 01-122016, for X. W. from the Research Grants Council of the Hong Kong No. 16300117 and 16301816.
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