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4 November 2016 Tunnelling anomalous and planar Hall effects (Conference Presentation)
Alex Matos-Abiague, Benedikt Scharf, Jong E. Han, Ewelina M. Hankiewicz, Igor Zutic
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Proceedings Volume 9931, Spintronics IX; 993125 (2016) https://doi.org/10.1117/12.2237237
Event: SPIE Nanoscience + Engineering, 2016, San Diego, California, United States
Abstract
We theoretically show how the interplay between spin-orbit coupling (SOC) and magnetism can result in a finite tunneling Hall conductance, transverse to the applied bias. For two-dimensional tunnel junctions with a ferromagnetic lead and magnetization perpendicular to the current flow, the detected anomalous Hall voltage can be used to extract information not only about the spin polarization but also about the strength of the interfacial SOC. In contrast, a tunneling current across a ferromagnetic barrier on the surface of a three-dimensional topological insulator (TI) can induce a planar Hall response even when the magnetization is oriented along the current flow[1]. The tunneling nature of the states contributing to the planar Hall conductance can be switched from the ordinary to the Klein regimes by the electrostatic control of the barrier strength. This allows for an enhancement of the transverse response and a giant Hall angle, with the tunneling planar Hall conductance exceeding the longitudinal component. Despite the simplicity of a single ferromagnetic region, the TI/ferromagnet system exhibits a variety of functionalities. In addition to a spin-valve operation for magnetic sensing and storing information, positive, negative, and negative differential conductances can be tuned by properly adjusting the barrier potential and/or varying the magnetization direction. Such different resistive behaviors in the same system are attractive for potential applications in reconfigurable spintronic devices. [1] B. Scharf, A. Matos-Abiague, J. E. Han, E. M. Hankiewicz, and I. Zutic, arXiv:1601.01009 (2016).
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Alex Matos-Abiague, Benedikt Scharf, Jong E. Han, Ewelina M. Hankiewicz, and Igor Zutic "Tunnelling anomalous and planar Hall effects (Conference Presentation)", Proc. SPIE 9931, Spintronics IX, 993125 (4 November 2016); https://doi.org/10.1117/12.2237237
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KEYWORDS
Ferromagnetics
Magnetism
System on a chip
Spintronics
Dielectrics
Lead
Magnetic sensors
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