Frequency selectivity of spin Hall magnetoresistance sensor and its applications in eddy current testing

Recently, we have developed a spin Hall magnetoresistance (SMR) sensor using the spin–orbit torque effective field as the built-in linearization mechanism, which allows us to achieve a linear, zero-offset, and low-noise magnetic field sensor without any dedicated magnetic bias. In this work, we exam...

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Published in:Applied physics letters 2021-01, Vol.118 (1)
Main Authors: Lu, Ling, Xie, Hang, Luo, Ziyan, Muthu, Natchammai, Chen, Xin, Li, Xiaomin, Hua, Younan, Wu, Yihong
Format: Article
Language:English
Subjects:
Aluminum
Applied physics
Circuits
Coils
Eddy current testing
Eddy currents
Flaw detection
Magnetic fields
Magnetoresistance
Magnetoresistivity
Metal plates
Principal components analysis
Selectivity
Sensors
Square waves
Surface cracks
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cited_by cdi_FETCH-LOGICAL-c393t-3e82c3c2dea4124b616c044c03b616f6c2b67feab5668570e0c47ca2b9b3da4b3
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container_issue 1
container_start_page
container_title Applied physics letters
container_volume 118
creator Lu, Ling
Xie, Hang
Luo, Ziyan
Muthu, Natchammai
Chen, Xin
Li, Xiaomin
Hua, Younan
Wu, Yihong
description Recently, we have developed a spin Hall magnetoresistance (SMR) sensor using the spin–orbit torque effective field as the built-in linearization mechanism, which allows us to achieve a linear, zero-offset, and low-noise magnetic field sensor without any dedicated magnetic bias. In this work, we examine the response of the SMR sensor to a time-varying magnetic field and demonstrate that its inherent frequency selectivity makes it uniquely suited for applications in eddy current testing. By applying a square wave current to both the coil and the sensor, and with the help of principal component analysis, we show that it is possible to detect surface cracks on an aluminum plate with dimensions down to 0.2 mm, without the need to use any sophisticated detection circuitry.
doi_str_mv 10.1063/5.0035837
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subjects Aluminum
Applied physics
Circuits
Coils
Eddy current testing
Eddy currents
Flaw detection
Magnetic fields
Magnetoresistance
Magnetoresistivity
Metal plates
Principal components analysis
Selectivity
Sensors
Square waves
Surface cracks
title Frequency selectivity of spin Hall magnetoresistance sensor and its applications in eddy current testing
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