Large Rashba unidirectional magnetoresistance in the Fe/Ge(111) interface states

Abstract

The structure inversion asymmetry at surfaces and interfaces give rise to the Rashba spin-orbit interaction (SOI), that breaks the spin degeneracy of surface or interface states. Hence, when an electric current runs through a surface or interface, this Rashba effect generates an effective magnetic field acting on the electron spin. This provides an additional tool to manipulate the spin state in materials such as Si and Ge that, in their bulk form, possess inversion symmetry (or lack structural inersion asymmetry). The existence of Rashba states could be demonstrated by photoemission spectroscopy at the interface between different metals and Ge(111) and by spin-charge conversion experiments at the Fe/Ge(111) interface even though made of two light elements. In this work, we identify the fingerprint of the Rashba states at the Fe/Ge(111) interface by magnetotransport measurements in the form of a large unidirectional magnetoresistance of up to 0.1 \%. From its temperature dependence, we find that the Rashba energy splitting is larger than in pure Ge(111) subsurface states.

arXiv comment6 pages, 5 figures

References in corpus (10)

• Semiconductor Spintronics
• Unidirectional spin Hall magnetoresistance in ferromagnet/normal metal bilayers
• Room-Temperature Electron Spin Transport in a Highly Doped Si Channel
• Bilinear magneto-electric resistance as a probe of three-dimensional spin texture in topological surface states
• Observation of out-of-plane spin texture in a SrTiO3 (111) two-dimensional electron gas
• Electrical spin injection and detection in an InAs quantum well
• Observation of Large Unidirectional Rashba Magnetoresistance in Ge(111)
• Determining the Rashba parameter from the bilinear magnetoresistance response in a two-dimensional electron gas
• Tuning spin-charge interconversion with quantum confinement in ultrathin Bi/Ge(111) films
• Theory of bilinear magneto-electric resistance from topological-insulator surface states

Cited by in corpus (10)

• Unidirectional Magnetoresistance in Antiferromagnet/Heavy-metal bilayers
• Quantum kinetic theory of quadratic responses
• Spin anomalous-Hall unidirectional magnetoresistance
• Quantum unidirectional magnetoresistance
• Proximity-induced nonlinear magnetoresistances on topological insulators
• Electric field effect on electron gas spins in two-dimensional magnets with strong spin-orbit coupling
• Observation of the In-plane Anomalous Hall Effect induced by Octupole in Magnetization Space
• Topological linear magnetoresistivity and thermoconductivity induced by noncentrosymmetric Berry curvature
• Bilinear magnetoresistance in topological insulators: role of magnetic disorder
• Theory of unidirectional magnetoresistance and nonlinear Hall effect