Spin-orbit-torque-enabled three-dimensional magnetic field sensor with low offset and high sensitivity

Title (eng)
Spin-orbit-torque-enabled three-dimensional magnetic field sensor with low offset and high sensitivity
Author
Sebastian Zeilinger
University of Vienna
Author
Johannes Güttinger
University of Vienna
Author
Armin Satz
University of Vienna
Author
Hubert Brückl
University for Continuing Education Krems
Author
et al.
Description (eng)
In this work we demonstrate a spin-orbit-torque (SOT) magnetic field sensor, designed as a Ta/Co FeB/MgO structure, with high sensitivity and capable of active offset compensation in all three spatial directions. This is described and verified in experiment and simulation. The measurements of magnetic fields showed an offset of 35, 42, and 3 μT for 𝑥-, 𝑦-, and 𝑧-fields respectively. Furthermore, the sensitivities of these measurements had values of 590, 580, and 490 VA−1 T−1 in the 𝑥-, 𝑦-, and 𝑧-direction, respectively. In addition, the robustness to bias fields is demonstrated via experiments and single-spin simulations by applying bias fields in the 𝑦-direction. Cross sensitivities were further analyzed via single-spin simulations, performing a parameter sweep of different bias fields in the 𝑦- and 𝑧-direction up to ±1 mT. The extraction of the SOT parameters 𝜂DL and 𝜂FL is shown via an optimization of a single-spin curve to the experimental measurements.
Keywords (eng)
MagnetismSpin-orbit torqueSpintronicsMagnetic systems
Type (eng)
journal article
Language
[eng]
Persistent identifier
https://door.donau-uni.ac.at/o:5928
DOI
10.1103/997y-hk7m
Is in series
Title (deu)
Physical Review Applied
Volume
24
Publication
American Physical Society
Date issued
2025-12-11
License
CC BY 4.0 International