Hysteresis Suppressing of Modulated Magnetoresistive Sensors Using Bidirection Pulse Magnetization

Hu, Jiafei; Pan, Mengchun; Sun, Kun; Chen, Dixiang; Li, Sizhong; Du, Qingfa; Wang, Yuan; Pan, Long; Zhou, Wei; Zhang, Qi; Li, Peisen; Peng, Junping; Qiu, Weicheng; Zhou, Jianjiang; Wu, Xuezhong

doi:10.1109/tmag.2017.2771372

Cited by 4 publications

(1 citation statement)

References 28 publications

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“…It is worth pointing out that hysteresis was still inevitable in the sensor, as shown in Figure 5, which is similar to previous papers [15,18]. In order to restrain the influence of this hysteresis for the application of sensing elements, on the one hand, researchers have taken many measures (e.g., optimizing the annealing process, biasing the sensor with permanent magnetic materials, or inducing perpendicular anisotropy in the free layer by reducing the thickness of the free layer [24,25]) to reduce the hysteresis, and on the other hand, we can also magnetize the sensor to the saturation state to ensure working at the same branch [26]. In this way, the hysteresis errors of the device without and with the double-gap MFC were 5.1% and 5.6%, respectively.…”

Section: Resultsmentioning

confidence: 99%

Double-Gap Magnetic Flux Concentrator Design for High-Sensitivity Magnetic Tunnel Junction Sensors

Qiu

et al. 2019

Sensors

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To improve the sensitivity of the magnetic tunnel junction(MTJ)sensor, a novel architecture for a double-gap magnetic flux concentrator (MFC) was studied theoretically and experimentally in this paper. The three-dimensional finite element model of magnetic flux was established to optimize the magnetic field amplification factor, with different gaps. The simulation results indicate that the sensitivity of an MTJ sensor with a double-gap MFC can be significantly better than that of a sensor with a traditional single-gap MFC, due to the fact that the magnetic magnification sharply increases with the decrease in effective gap width. Besides this, the half-bridge MTJ sensors with the double-gap MFC were fabricated using photolithography, ion milling, evaporation, and electroplating processes. Experimental results show that the sensitivity of the MTJ sensor increased by ten times compared to the sensor without the double-gap MFC, which underlines the theoretical predictions. Furthermore, there is no significant increase in the sensor noise. The work in this paper contributes to the development of high-performance MTJ sensors.

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