TY - JOUR
T1 - Hybrid Magnetic Sensor Combined with a Tunnel Magnetoresistive Sensor and High-Temperature Superconducting Magnetic-Field-Focusing Plates
AU - Tsukada, Keiji
AU - Hirata, Tetsuro
AU - Goda, Yuto
AU - Sakai, Kenji
AU - Kiwa, Toshihiko
N1 - Funding Information:
Manuscript received January 17, 2018; revised July 4, 2018; accepted September 29, 2018. Date of publication October 9, 2018; date of current version January 8, 2019. This work was supported by the Council for Science, Technology and Innovation and Cross-ministerial Strategic Innovation Promotion Program, Infrastructure Maintenance, Renovation, and Management under Grant (funding agency: JST). This paper was recommended by Associate Editor H. Fujishiro. (Corresponding author: Keiji Tsukada.) The authors are with the Graduate School of Interdisciplinary Science and Engineering in Health Systems, Okayama University, Okayama 700-8530, Japan (e-mail:, tsukada@cc.okayama-u.ac.jp; p1ok3h10@s. okayama-u.ac.jp; pvpo2lvr@s.okayama-u.ac.jp; sakai-k@okayama-u.ac.jp; kiwa@okayamau.ac.jp).
Publisher Copyright:
© 2002-2011 IEEE.
PY - 2019/4
Y1 - 2019/4
N2 - Magnetoresistive (MR) sensors are widely used, particularly in consumer products. However, in applications requiring extremely sensitive magnetic sensors, superconducting quantum interference devices (SQUIDs) are primarily used. In this study, we develop a hybrid magnetic sensor by combining an MR sensor with two high-temperature superconducting (HTS) plates to achieve sensitivity that lies between those of MR sensors and SQUIDs. In addition, we apply a modulation method for measuring the absolute magnetic field. A nanogranular in-gap tunnel MR sensor is installed inside the slit between the magnetic-field-focusing HTS plates, and the magnetic response is evaluated. Using the magnetic-field-focusing characteristics of the HTS plates (made from YBa2Cu3O7-δ) and the MR sensor inside the slit between the two plates, the sensitivity and noise characteristics are improved. Adjustment of parameters, such as MR sensor height from the slit, slit width of the HTS plates, and plate size allow sensitivity control depending on the application. Moreover, the absolute magnetic response and low noise in low-frequency regions are obtained through ac modulation.
AB - Magnetoresistive (MR) sensors are widely used, particularly in consumer products. However, in applications requiring extremely sensitive magnetic sensors, superconducting quantum interference devices (SQUIDs) are primarily used. In this study, we develop a hybrid magnetic sensor by combining an MR sensor with two high-temperature superconducting (HTS) plates to achieve sensitivity that lies between those of MR sensors and SQUIDs. In addition, we apply a modulation method for measuring the absolute magnetic field. A nanogranular in-gap tunnel MR sensor is installed inside the slit between the magnetic-field-focusing HTS plates, and the magnetic response is evaluated. Using the magnetic-field-focusing characteristics of the HTS plates (made from YBa2Cu3O7-δ) and the MR sensor inside the slit between the two plates, the sensitivity and noise characteristics are improved. Adjustment of parameters, such as MR sensor height from the slit, slit width of the HTS plates, and plate size allow sensitivity control depending on the application. Moreover, the absolute magnetic response and low noise in low-frequency regions are obtained through ac modulation.
KW - Absolute magnetic measurement
KW - magnetic field focusing
KW - magnetic sensor
KW - tunnel magnetoresitance (TMR)
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U2 - 10.1109/TASC.2018.2874354
DO - 10.1109/TASC.2018.2874354
M3 - Article
AN - SCOPUS:85054614002
VL - 29
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
SN - 1051-8223
IS - 3
M1 - 8486746
ER -