Low Hysteresis and High Stability in Tunneling Magnetoresistance Vortex Sensors With a Composite Free Layer

Jiaming Liu; Mengmeng Guan; Yunxiang Gong; Fanji Ni; Xinxin Gao; Wei Su; Zhiguang Wang; Zhuangde Jiang; Zhongqiang Hu; Ming Liu

doi:10.1109/LED.2024.3401830

Low Hysteresis and High Stability in Tunneling Magnetoresistance Vortex Sensors With a Composite Free Layer

Jiaming Liu
, Mengmeng Guan
, Yunxiang Gong
, Fanji Ni
, Xinxin Gao
, Wei Su
, Zhiguang Wang
, Zhuangde Jiang
, Zhongqiang Hu
, Ming Liu

Xi'an Jiaotong University

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

The linearity of tunneling magnetoresistance (TMR) sensors is challenging due to the intrinsic magnetic hysteresis of the ferromagnetic Co-Fe-B layer used as the free layer. In this work, by using a composite free layer of Co-Fe-B/Ta/Co-Fe-Si-B with optimized geometric, we demonstrate vortex magnetic states in TMR sensors with large magnetic tunneling junctions, leading to low hysteresis and high stability under external magnetic fields, with a sensitivity of 6 mV/V/Oe (0.6% Oe-1 ) and a nonlinearity below 0.5% FS within ±20 Oe. TMR vortex sensors with a composite free layer could be potentially useful in high precision current sensing in harsh environment.

Original language	English
Pages (from-to)	1289-1292
Number of pages	4
Journal	IEEE Electron Device Letters
Volume	45
Issue number	7
DOIs	https://doi.org/10.1109/LED.2024.3401830
State	Published - 1 Jul 2024

Keywords

Hysteresis
magnetic sensor
tunneling magnetoresistive (TMR)
vortex state

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10.1109/LED.2024.3401830

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title = "Low Hysteresis and High Stability in Tunneling Magnetoresistance Vortex Sensors With a Composite Free Layer",

abstract = "The linearity of tunneling magnetoresistance (TMR) sensors is challenging due to the intrinsic magnetic hysteresis of the ferromagnetic Co-Fe-B layer used as the free layer. In this work, by using a composite free layer of Co-Fe-B/Ta/Co-Fe-Si-B with optimized geometric, we demonstrate vortex magnetic states in TMR sensors with large magnetic tunneling junctions, leading to low hysteresis and high stability under external magnetic fields, with a sensitivity of 6 mV/V/Oe (0.6\% Oe-1 ) and a nonlinearity below 0.5\% FS within ±20 Oe. TMR vortex sensors with a composite free layer could be potentially useful in high precision current sensing in harsh environment.",

keywords = "Hysteresis, magnetic sensor, tunneling magnetoresistive (TMR), vortex state",

author = "Jiaming Liu and Mengmeng Guan and Yunxiang Gong and Fanji Ni and Xinxin Gao and Wei Su and Zhiguang Wang and Zhuangde Jiang and Zhongqiang Hu and Ming Liu",

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doi = "10.1109/LED.2024.3401830",

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AU - Liu, Jiaming

AU - Guan, Mengmeng

AU - Gong, Yunxiang

AU - Ni, Fanji

AU - Gao, Xinxin

AU - Su, Wei

AU - Wang, Zhiguang

AU - Jiang, Zhuangde

AU - Hu, Zhongqiang

AU - Liu, Ming

PY - 2024/7/1

Y1 - 2024/7/1

N2 - The linearity of tunneling magnetoresistance (TMR) sensors is challenging due to the intrinsic magnetic hysteresis of the ferromagnetic Co-Fe-B layer used as the free layer. In this work, by using a composite free layer of Co-Fe-B/Ta/Co-Fe-Si-B with optimized geometric, we demonstrate vortex magnetic states in TMR sensors with large magnetic tunneling junctions, leading to low hysteresis and high stability under external magnetic fields, with a sensitivity of 6 mV/V/Oe (0.6% Oe-1 ) and a nonlinearity below 0.5% FS within ±20 Oe. TMR vortex sensors with a composite free layer could be potentially useful in high precision current sensing in harsh environment.

AB - The linearity of tunneling magnetoresistance (TMR) sensors is challenging due to the intrinsic magnetic hysteresis of the ferromagnetic Co-Fe-B layer used as the free layer. In this work, by using a composite free layer of Co-Fe-B/Ta/Co-Fe-Si-B with optimized geometric, we demonstrate vortex magnetic states in TMR sensors with large magnetic tunneling junctions, leading to low hysteresis and high stability under external magnetic fields, with a sensitivity of 6 mV/V/Oe (0.6% Oe-1 ) and a nonlinearity below 0.5% FS within ±20 Oe. TMR vortex sensors with a composite free layer could be potentially useful in high precision current sensing in harsh environment.

KW - Hysteresis

KW - magnetic sensor

KW - tunneling magnetoresistive (TMR)

KW - vortex state

UR - https://www.scopus.com/pages/publications/85193464833

U2 - 10.1109/LED.2024.3401830

DO - 10.1109/LED.2024.3401830

M3 - 文章

AN - SCOPUS:85193464833

SN - 0741-3106

VL - 45

SP - 1289

EP - 1292

JO - IEEE Electron Device Letters

JF - IEEE Electron Device Letters

IS - 7

ER -

Low Hysteresis and High Stability in Tunneling Magnetoresistance Vortex Sensors With a Composite Free Layer

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Keywords

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