Hall detection of a ppm spin polarization

Abstract

Hall effects have been employed as sensitive detectors of magnetic fields and magnetizations. In spintronics, exotic phenomena often emerge from a non-equilibrium spin polarization or magnetization, that is very difficult to measure directly. The challenge is due to the tiny total moment, which is out of reach of superconducting quantum interference devices and vibrating sample magnetometers or spectroscopic methods such as X-ray magnetic circular dichroism. The Kerr effect is sufficiently sensitive only in direct gap semiconductors, in which the Kerr angle can be resonantly enhanced. Here we demonstrate that even one excess spin in a million can be detected by a Hall effect at room temperature. The novel Hall effect is not governed by the spin Hall conductivity but by its energy derivative thereby related to the spin Nernst effect.

References in corpus (12)

• Direct electronic measurement of the spin Hall effect
• Spin Seebeck insulator
• First Principles Calculation of Anomalous Hall Conductivity in Ferromagnetic bcc Fe
• Proximity-induced ferromagnetism in graphene revealed by anomalous Hall effect
• Longitudinal Spin Seebeck Effect Free from the Proximity Nernst Effect
• Critical suppression of spin Seebeck effect by magnetic fields
• Multivariable Scaling for the Anomalous Hall Effect
• Direct detection of pure spin-current by x-ray pump-probe measurements
• X-Ray Detection of Transient Magnetic Moments Induced by a Spin Current in Cu
• Microwave-induced spin currents in ferromagnetic-insulator|normal-metal bilayer system
• Sign change of the spin Hall effect due to electron correlation in nonmagnetic CuIr alloys
• Thermal Creation of Electron Spin Polarization in n-Type Silicon

Cited by in corpus (8)

• The Spin Nernst effect in Tungsten
• Measurement of spin pumping voltage separated from extrinsic microwave effects
• Ferroic collinear multilayer magnon spin valve
• The valley Nernst effect in WSe${}_2$
• Quantitative separation of the anisotropic magnetothermopower and planar Nernst effect by the rotation of an in-plane thermal gradient
• Anomalous Hall-like transverse magnetoresistance in Au thin films on Y${}_3$Fe${}_5$O${}_{12}$
• Green's function representation of spin pumping effect
• Grayscale control of local magnetic properties with direct-write laser annealing