Magnetic angular position sensor enabled by spin-orbit torque

Abstract

We propose a simple scheme for magnetic angular position sensor based on current-induced spin-orbit torque effect. A full range detection of 360o is realized with a pair of Hall crosses made of heavy metal/ferromagnet heterostructures. The current axes of the two Hall crosses are aligned orthogonal to each other such that when both devices are subject to a rotational in-plane magnetic field, the differential Hall voltage due to current pulses of opposite polarity exhibits a sine and cosine angular dependence on the field direction, respectively. The field rotational angle is then calculated from the sine and cosine output signals via the arctan2 function. A linear correspondence between the calculated and actual field angle is obtained in the field range of 500-2000 Oe, with an average angle error of 0.38-0.65o.

arXiv comment15 pages, 5 figures

References in corpus (5)

• Symmetry and magnitude of spin-orbit torques in ferromagnetic heterostructures
• Quantitative characterization of the spin orbit torque using harmonic Hall voltage measurements
• Interplay of spin-orbit torque and thermoelectric effects in ferromagnet/normal metal bilayers
• Fieldlike and antidamping spin-orbit torques in as-grown and annealed Ta/CoFeB/MgO layers
• Interface enhanced spin-orbit torques and current-induced magnetization switching of Pd/Co/AlO${}_x$ layers

Cited by in corpus (5)

• Spin torque gate magnetic field sensor
• A vector magnetometer based on a single spin-orbit torque anomalous Hall device
• Angular Position Sensor Based on Anisotropic Magnetoresistive and Anomalous Nernst Effect
• SOT Enabled 3D Magnetic Field Sensor with Low Offset and High Sensitivity
• Spin-Orbit Torque in a Single Ferromagnetic Layer with Large Spin-Orbit Coupling