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Nonlinear dynamics induced anomalous Hall effect in topological insulators.

Guanglei Wang1, Hongya Xu1, Ying-Cheng Lai1,2

  • 1School of Electrical, Computer, and Energy Engineering, Arizona State University, Tempe, AZ 85287, USA.

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|January 29, 2016
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Researchers discovered a new way the anomalous Hall effect can occur. This involves studying magnetic material dynamics on topological insulators, revealing nonlinear behaviors and a controllable Hall-like current for spintronics applications.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nonlinear Dynamics

Background:

  • The anomalous Hall effect (AHE) is crucial in spintronics, but its mechanisms are not fully understood.
  • Topological insulators (TIs) possess unique surface states with potential for novel electronic phenomena.
  • Ferromagnetic (FM) materials exhibit spontaneous magnetization, interacting with electronic transport.

Purpose of the Study:

  • To investigate an alternative mechanism for the anomalous Hall effect.
  • To explore the magnetisation dynamics of an insulating ferromagnet on a topological insulator surface.
  • To understand the interplay between spin-polarized currents, spin-transfer torque, and electron transmission.

Main Methods:

  • Theoretical investigation of a system comprising an insulating ferromagnet (FM) on a three-dimensional topological insulator (TI).
  • Analysis of magnetisation dynamics under an external voltage.
  • Modeling of spin-polarized current-induced spin-transfer torque and its feedback on surface electron transmission.

Main Results:

  • Observed nonlinear dynamical behaviors including multistability, chaos, and phase synchronisation.
  • Discovered a dynamics-mediated Hall-like current dependent on channel conductance.
  • Established a physical understanding of this alternative AHE mechanism.

Conclusions:

  • The nonlinear dynamics of FM/TI heterostructures offer a novel route to the anomalous Hall effect.
  • The controllable nature of the Hall-like current, arising from nonlinear dynamics, has significant implications for spintronic devices.
  • This work opens avenues for applications in Dirac-material based spintronics.