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Chip-Scale Magnetic Sensors
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Chip-Scale Magnetic Sensors

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

Deadline for manuscript submissions: closed (31 August 2021) | Viewed by 6306

Special Issue Editor

Dr. Ignacio Mateos

E-Mail Website
Guest Editor
Applied Magnetism and Optics Group, Universidad de Cádiz, 11519 Cádiz, Spain
Interests: magnetic sensors; low-noise electronic design; noise reduction techniques; space applications; magnetometry; electronics; electronic instrumentation; sensors; CubeSats; gravitational waves
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Continuous endeavors in microfabricated magnetic sensors have achieved a remarkable trade-off between size and performance. These breakthroughs have resulted in a wide variety of applications where detection of ultra-low or extremely-stable magnetic fields at room temperature is required. At present, arrays of chip-scale magnetic sensors aspire to exploit challenging applications such as continuous measurements of feeble biomagnetic signals for magnetoencephalography (MEG) or the slow drifts of the interplanetary magnetic field at sub-millihertz frequencies in space-based gravitational wave observatories.

This Special Issue, which includes regular research articles and review articles, aims to disseminate recent efforts in chip-scale magnetic sensors with a high sensing performance, such as GMR, TMR, AMR, MI, GMI, miniaturized optical atomic magnetometers, and micro-fluxgates. In addition, we invite authors to contribute in topics that encompass the numerous strategies for improving the characteristics of the devices or boosting experimental measurements for demanding low-noise applications with strict size constraints. The range of applications includes but is not restricted to the following areas:

  • Biomedicine
  • Fundamental physics experiments
  • Space science
  • Nondestructive testing
  • Human–computer interaction
  • Dynamics of geomagnetic fields
  • Search for magnetic anomalies
  • Flexible/wearable electronics

Dr. Ignacio Mateos
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Sensors is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Tunnel magnetoresistive (TMR) sensors
  • Giant magnetoresistive (GMR) sensors
  • Anisotropic magnetoresistive (AMR) sensors
  • Magnetoimpedance (MI)
  • Giant magnetoimpedance (GMI)
  • Micro-fluxgate magnetometers
  • Optical Atomic magnetometers
  • Advanced magnetic thin films
  • CMOS integration
  • Noise in magnetic sensors
  • Biomedical applications
  • Wearable/portable electronics
  • Space applications
  • Nondestructive testing
  • Low-noise applications

Published Papers (2 papers)

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Research

10 pages, 3124 KiB  
Communication
Chip-Scale Ultra-Low Field Atomic Magnetometer Based on Coherent Population Trapping
by Hyun-Gue Hong, Sang Eon Park, Sang-Bum Lee, Myoung-Sun Heo, Jongcheol Park, Tae Hyun Kim, Hee Yeon Kim and Taeg Yong Kwon
Sensors 2021, 21(4), 1517; https://doi.org/10.3390/s21041517 - 22 Feb 2021
Cited by 6 | Viewed by 2511
Abstract
We report a chip-scale atomic magnetometer based on coherent population trapping, which can operate near zero magnetic field. By exploiting the asymmetric population among magnetic sublevels in the hyperfine ground state of cesium, we observe that the resonance signal acquires sensitivity to magnetic [...] Read more.
We report a chip-scale atomic magnetometer based on coherent population trapping, which can operate near zero magnetic field. By exploiting the asymmetric population among magnetic sublevels in the hyperfine ground state of cesium, we observe that the resonance signal acquires sensitivity to magnetic field in spite of degeneracy. A dispersive signal for magnetic field discrimination is obtained near-zero-field as well as for finite fields (tens of micro-tesla) in a chip-scale device of 0.94 cm3 volume. This shows that it can be readily used in low magnetic field environments, which have been inaccessible so far in miniaturized atomic magnetometers based on coherent population trapping. The measured noise floor of 300 pT/Hz1/2 at the zero-field condition is comparable to that of the conventional finite-field measurement obtained under the same conditions. This work suggests a way to implement integrated atomic magnetometers with a wide operating range. Full article
(This article belongs to the Special Issue Chip-Scale Magnetic Sensors)
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17 pages, 3041 KiB  
Article
Optimization of magnetic properties and GMI effect of Thin Co-rich Microwires for GMI Microsensors
by Lorena Gonzalez-Legarreta, Paula Corte-Leon, Valentina Zhukova, Mihail Ipatov, Juan Maria Blanco, Julian Gonzalez and Arcady Zhukov
Sensors 2020, 20(6), 1558; https://doi.org/10.3390/s20061558 - 11 Mar 2020
Cited by 42 | Viewed by 2974
Abstract
Magnetic microwires can present excellent soft magnetic properties and a giant magnetoimpedance effect. In this paper, we present our last results on the effect of postprocessing allowing optimization of the magnetoimpedance effect in Co-rich microwires suitable for magnetic microsensor applications. Giant magnetoimpedance effect [...] Read more.
Magnetic microwires can present excellent soft magnetic properties and a giant magnetoimpedance effect. In this paper, we present our last results on the effect of postprocessing allowing optimization of the magnetoimpedance effect in Co-rich microwires suitable for magnetic microsensor applications. Giant magnetoimpedance effect improvement was achieved either by annealing or stress-annealing. Annealed Co-rich presents rectangular hysteresis loops. However, an improvement in magnetoimpedance ratio is observed at fairly high annealing temperatures over a wide frequency range. Application of stress during annealing at moderate values of annealing temperatures and stress allows for a remarkable decrease in coercivity and increase in squareness ratio and further giant magnetoimpedance effect improvement. Stress-annealing, carried out at sufficiently high temperatures and/or stress allowed induction of transverse magnetic anisotropy, as well as magnetoimpedance effect improvement. Enhanced magnetoimpedance ratio values for annealed and stress-annealed samples and frequency dependence of the magnetoimpedance are discussed in terms of the radial distribution of the magnetic anisotropy. Accordingly, we demonstrated that the giant magnetoimpedance effect of Co-rich microwires can be tailored by controlling the magnetic anisotropy of Co-rich microwires, using appropriate thermal treatment. Full article
(This article belongs to the Special Issue Chip-Scale Magnetic Sensors)
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