Anomalous Nernst effect in Ir<sub>22</sub>Mn<sub>78</sub>/Co<sub>20</sub>Fe<sub>60</sub>B<sub>20</sub>/MgO layers with perpendicular magnetic anisotropy

POSTER

Abstract

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.

Presenters

  • Jianyu Zhang

    • BeiHang University

Authors

  • Sa Tu

    • BeiHang University

  • Junfeng Hu

    • BeiHang University

  • Guoqiang Yu

    • University of California, Los Angeles
    • Univ of California - Los Angeles
    • Department of Electrical Engineering, UCLA
    • BeiHang University
    • Electrical Engineering, University of California Los Angeles

  • Haiming Yu

    • BeiHang University

  • Chuanpu Liu

    • BeiHang University

  • Florian Heimbach

    • BeiHang University

  • Xiangrong Wang

    • Physics, Hong Kong Univ of Sci & Tech
    • Hong Kong University Science & Technology

  • Jianyu Zhang

    • BeiHang University

  • Youguang Zhang

    • BeiHang University

  • Amir Hamzic

    • Department of Physics

  • Kang L Wang

    • Univ of California - Los Angeles
    • University of California, Los Angeles

  • Weisheng Zhao

    • BeiHang University

  • Jean-Philippe Ansermet

    • Institute of Physics, Ecole Polytec Fed De Lausanne