Large Unidirectional Magnetoresistance in a Magnetic Topological Insulator

Abstract

We report current-direction dependent or unidirectional magnetoresistance (UMR) in magnetic/nonmagnetic topological insulator (TI) heterostructures, Cr${}_x$(Bi${}_{1-y}$Sb${}_y$)${}_{2-x}$Te${}_3$/(Bi${}_{1-y}$Sb${}_y$)${}_2$Te${}_3$, that is several orders of magnitude larger than in other reported systems. From the magnetic field and temperature dependence, the UMR is identified to originate from the asymmetric scattering of electrons by magnons. In particular, the large magnitude of UMR is an outcome of spin-momentum locking and a small Fermi wavenumber at the surface of TI. In fact, the UMR is maximized around the Dirac point with the minimal Fermi wavenumber.

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• Topological Insulators
• Spin torque switching with the giant spin Hall effect of tantalum
• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• Magnetic switching by spin torque from the spin Hall effect
• Spin Torque Ferromagnetic Resonance Induced by the Spin Hall Effect
• Spin Transfer Torque Generated by the Topological Insulator Bi_2Se_3
• Crossover of Three-Dimensional Topological Insulator of Bi2Se3 to the Two-Dimensional Limit
• Observation of the Magnon Hall Effect
• Band structure engineering in (Bi1-xSbx)2Te3 ternary topological insulators
• Unidirectional spin Hall magnetoresistance in ferromagnet/normal metal bilayers
• Fermi level dependent charge-to-spin current conversion by Dirac surface state of topological insulators
• Hedgehog Spin-texture and Berry's Phase tuning in a Magnetic Topological Insulator
• Longitudinal Spin Seebeck Effect Free from the Proximity Nernst Effect
• Carrier-independent ferromagnetism and giant anomalous Hall effect in magnetic topological insulator
• Observation of the spin Peltier effect
• Critical suppression of spin Seebeck effect by magnetic fields
• Quantum Hall Effect on Top and Bottom Surface States of Topological Insulator (Bi1-xSbx)2Te3 Films
• Magnetoresistance of heavy and light metal/ferromagnet bilayers
• Electrical detection of magnetization reversal without auxiliary magnets
• Quantum Hall States Stabilized in Semi-magnetic Bilayers of Topological Insulators

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