Vector Magnetometer Based on a Single Spin-Orbit-Torque Anomalous-Hall Device

Chen, Xin; Xie, Hang; Shen, Haoxuan; Wu, Yihong

doi:10.1103/physrevapplied.18.024010

Cited by 6 publications

(8 citation statements)

References 53 publications

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“…Depending on the magnet chosen and positioning of the sensor, various types of magnetic sensors can be used, including the recently developed spin-orbit torque enabled magnetic sensor (Supplementary Fig. 1 in Supplementary Note 1 ) 20 – 22 . To facilitate mounting of the sensor, the data presented in this paper are collected using a commercial tunnel magnetoresistance sensor with a dynamic range around 100 Oe and sensitivity of 1.28 mV/Oe (TMR2005 from MultiDimension Technology).…”

Section: Resultsmentioning

confidence: 99%

A fingertip-type magnetic pulse detection device for unusual monitoring conditions

Shen

2023

Commun Eng

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Wearable devices for continuous non-invasive monitoring of physiological signals are crucial for preventive care and management of chronic conditions. However, these devices are either sensitive to skin conditions or require external stimuli, such as light or electrical excitation, to penetrate the skin for pulse detection. This often results in large motion artifacts and unsuitability for certain skin conditions. Here we demonstrate a simple fingertip-type device which can detect clear pulse signals under a range of conditions, including fingers covered by opaque substances such as a plaster or nail polish, or fingers immersed in water. The structure of the device consists of a pair of magnets and a magnetic sensor. Both experimental and numerical results show that the detected pulsation signals correspond directly to the vibrations induced by blood circulation with negligible influence from modulated magnetic signature of blood. Therefore, this device could be used in conditions which are challenging for existing pulse detectors and might also have its application extended to blood pressure measurement.

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Section: Resultsmentioning

confidence: 99%

A fingertip-type magnetic pulse detection device for unusual monitoring conditions

Shen

2023

Commun Eng

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“…Compared to full 360 • commercial magnetic position sensors and SOT-based angle sensors as shown in Table 1 [10,13,16,17,25], the sensor presented in this work exhibits several notable advantages, particularly in its structural simplicity. Utilizing a single Wheatstone bridge structure, our sensor distinguishes itself from other magnetic field sensors that often necessitate the combination of multiple devices.…”

Section: Discussionmentioning

confidence: 99%

“…These sensors typically have a much simpler design as compared to the conventional AMR, GMR, and TMR sensors. In fact, all of these sensors, including the SMR sensor [14], spin torque gate (STG) sensor [15], SOT-enabled anomalous Hall (AHE) vector magnetometer [16], and SOT-based magnetic angular sensor [17] are based merely on a simple ultrathin ferromagnet (FM)/heavy metal (HM) bilayer without any magnetic bias, which greatly simplifies the sensor design and reduces the manufacturing cost. However, the SOT-based sensors typically have a relatively small dynamic range, which may limit their applications in settings with a large environmental magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Angular Position Sensor Based on Anisotropic Magnetoresistive and Anomalous Nernst Effect

Wang,

Xie,

2024

Sensors

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Magnetic position sensors have extensive applications in various industrial sectors and consumer products. However, measuring angles in the full range of 0–360° in a wide field range using a single magnetic sensor remains a challenge. Here, we propose a magnetic position sensor based on a single Wheatstone bridge structure made from a single ferromagnetic layer. By measuring the anisotropic magnetoresistance (AMR) signals from the bridge and two sets of anomalous Nernst effect (ANE) signals from the transverse ports on two perpendicular Wheatstone bridge arms concurrently, we show that it is possible to achieve 0–360° angle detection using a single bridge sensor. The combined use of AMR and ANE signals allows a mean angle error in the range of 0.51–1.05° within a field range of 100 Oe–10,000 Oe to be achieved.

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“…16 Recently, intriguing physical phenomena such as spin−orbit torque (SOT) and the anomalous Hall effect (AHE) are promising to motivate the development of a planar 3D magnetic sensor beyond traditional Hall and MR devices. 17 Based on the SOT effect, Wu et al proposed the spin torque gate (STG) magnetic field sensor, which can achieve a linear response to magnetic field without any magnetic bias, in a simple Hall bar structure. 18 Additionally, You et al have put forward an ingenious approach to distinguishing the three magnetic field components (H x , H y , and H z ) with alternating driving current directions in a single Hall-bar device.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, intriguing physical phenomena such as spin–orbit torque (SOT) and the anomalous Hall effect (AHE) are promising to motivate the development of a planar 3D magnetic sensor beyond traditional Hall and MR devices . Based on the SOT effect, Wu et al proposed the spin torque gate (STG) magnetic field sensor, which can achieve a linear response to magnetic field without any magnetic bias, in a simple Hall bar structure .…”

Section: Introductionmentioning

confidence: 99%

Wide Linearity Range 3D Magnetic Sensor and Angular Position Detector Based on a Single FePt Spin–Orbit Torque Device

Tao,

Guo,

et al. 2024

ACS Appl. Mater. Interfaces

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Three-dimensional (3D) vector magnetic sensors play a significant role in a variety of industries, especially in the automotive industry, which enables the control of precise position, angle, and rotation of motion elements. Traditional 3D magnetic sensors integrate multiple sensors with their sensing orientations along the three coordinate axes, leading to a large size and inevitable nonorthogonal misalignment. Here, we demonstrate a wide linearity range 3D magnetic sensor utilizing a single L10-FePt Hall-bar device, whose sensitivity is 291 VA–1 T–1 in the z-axis and 27 VA–1 T–1 in the in-plane axis. Based on the spin–orbit torque-dominated magnetization reversal, the linear response of anomalous Hall resistance within a large linear range (±200 Oe) for the x, y, and z components of magnetic fields has been obtained, respectively. Typically, it exhibits a relatively lower magnetic noise level of 7.9 nV at 1 Hz than previous results, improving measurement resolution at the low frequency. Furthermore, we provide a straightforward approach for noncontact angular position detection based on a single Hall-bar device, which shows great potential for application in rotational motion control.

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Vector Magnetometer Based on a Single Spin-Orbit-Torque Anomalous-Hall Device

Cited by 6 publications

References 53 publications

A fingertip-type magnetic pulse detection device for unusual monitoring conditions

A fingertip-type magnetic pulse detection device for unusual monitoring conditions

Angular Position Sensor Based on Anisotropic Magnetoresistive and Anomalous Nernst Effect

Wide Linearity Range 3D Magnetic Sensor and Angular Position Detector Based on a Single FePt Spin–Orbit Torque Device

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