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Advances in Magnetic Sensors

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Physical Sensors".

Deadline for manuscript submissions: closed (30 September 2022) | Viewed by 2289

Special Issue Editor


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Guest Editor
Department of Engineering, Tohoku University, Sendai 980-8579, Japan
Interests: magnetic sensor; high-frequency measurement; biomedical sensor; magnetic nano particle; permeability measurement; electromagnetic measurement
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Since magnetic sensors can provides diverse information and measure various physical quantities wirelessly, they are used for various purposes such as measurement and control of power electronics including motors, automobile sensors, hard disk magnetic heads, and geomagnetic sensors for mobile phones. On the other hand, by using large-scale information processing technology such as big data and cloud, information from many sensors on the network is obtained and applied for analyses regarding the environment, disaster prevention, logistics, energy, healthcare, medical care, welfare, education. Magnetic field sensors are also used in various magnetic measurement systems, and their types and operating principles are diverse. On the other hand, SQUID (superconducting quantum interference element) magnetometers, optical pumping sensors, magnetoresistive sensors (GMR, TMR, GIGS, etc.), fluxgate sensors, GMI sensors, and Hall sensors have become more sensitive and functional. In the Special Issue "Advances in Magnetic Sensors", findings in basic research on magnetic sensors and related applications will be reported, including magnetic storage, biomedical applications, Internet of Things, non-destructive tests, or energy harvesting. Each article will introduce a representative magnetic field sensors, including the history of its development, operating principles, applications, features, and fields of use.

Prof. Dr. Shin Yabukami
Guest Editor

Manuscript Submission Information

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Keywords

  • Magnetic sensors
  • Biosensing system
  • Energy harvest
  • Health care
  • Internet of Things
  • Non-destructive test

Published Papers (1 paper)

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Research

13 pages, 2736 KiB  
Article
The Effect of Geometrical Overlap between Giant Magnetoresistance Sensor and Magnetic Flux Concentrators: A Novel Comb-Shaped Sensor for Improved Sensitivity
by Prabhanjan D. Kulkarni, Hitoshi Iwasaki and Tomoya Nakatani
Sensors 2022, 22(23), 9385; https://doi.org/10.3390/s22239385 - 1 Dec 2022
Cited by 6 | Viewed by 1616
Abstract
The combination of magnetoresistive (MR) element and magnetic flux concentrators (MFCs) offers highly sensitive magnetic field sensors. To maximize the effect of MFC, the geometrical design between the MR element and MFCs is critical. In this paper, we present simulation and experimental studies [...] Read more.
The combination of magnetoresistive (MR) element and magnetic flux concentrators (MFCs) offers highly sensitive magnetic field sensors. To maximize the effect of MFC, the geometrical design between the MR element and MFCs is critical. In this paper, we present simulation and experimental studies on the effect of the geometrical relationship between current-in-plane giant magnetoresistive (GMR) element and MFCs made of a NiFeCuMo film. Finite element method (FEM) simulations showed that although an overlap between the MFCs and GMR element enhances their magneto-static coupling, it can lead to a loss of magnetoresistance ratio due to a magnetic shielding effect by the MFCs. Therefore, we propose a comb-shaped GMR element with alternate notches and fins. The FEM simulations showed that the fins of the comb-shaped GMR element provide a strong magneto-static coupling with the MFCs, whereas the electric current is confined within the main body of the comb-shaped GMR element, resulting in improved sensitivity. We experimentally demonstrated a higher sensitivity of the comb-shaped GMR sensor (36.5 %/mT) than that of a conventional rectangular GMR sensor (28 %/mT). Full article
(This article belongs to the Special Issue Advances in Magnetic Sensors)
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