Thermally driven transverse transports and magnetic dynamics on a topological surface capped with a ferromagnet strip

We theoretically study thermally driven transport of the Dirac fermions on the surface of a topological insulator capped with a ferromagnet strip. The generation and manipulation of anomalous Hall and Nernst effects are analyzed, in which the in-plane magnetization of the ferromagnet film is found t...

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Bibliographic Details
Published in:Journal of applied physics 2016-02, Vol.119 (7)
Main Authors: Deng, Ming-Xun, Zhong, Ming, Zheng, Shi-Han, Qiu, Jian-Ming, Yang, Mou, Wang, Rui-Qiang
Format: Article
Language:English
Subjects:
Applied physics
Fermions
Ferromagnetism
Magnetic anisotropy
Magnetization
Resistance
Thermoelectricity
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Summary:We theoretically study thermally driven transport of the Dirac fermions on the surface of a topological insulator capped with a ferromagnet strip. The generation and manipulation of anomalous Hall and Nernst effects are analyzed, in which the in-plane magnetization of the ferromagnet film is found to take a decisive role. This scenario is distinct from that modulated by Berry phase where the in-plane magnetization is independent. We further discuss the thermal spin-transfer torque as a backaction of the thermoelectric transports on the magnetization and calculate the dynamics of the anomalous Hall and Nernst effects self-consistently. It is found that the magnitude of the long-time steady Hall and Nernst conductance is determined by competition between the magnetic anisotropy and current-induced effective anisotropy. These results open up a possibility of magnetically controlling the transverse thermoelectric transports or thermally manipulating the magnet switching.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4941824