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

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 magnet...

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Autores principales: Hu, Jiafei, Ji, Minhui, Qiu, Weicheng, Pan, Long, Li, Peisen, Peng, Junping, Hu, Yueguo, Liu, Huiyan, Pan, Mengchun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6832420/
https://www.ncbi.nlm.nih.gov/pubmed/31619009
http://dx.doi.org/10.3390/s19204475
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author Hu, Jiafei
Ji, Minhui
Qiu, Weicheng
Pan, Long
Li, Peisen
Peng, Junping
Hu, Yueguo
Liu, Huiyan
Pan, Mengchun
author_facet Hu, Jiafei
Ji, Minhui
Qiu, Weicheng
Pan, Long
Li, Peisen
Peng, Junping
Hu, Yueguo
Liu, Huiyan
Pan, Mengchun
author_sort Hu, Jiafei
collection PubMed
description 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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spelling pubmed-68324202019-11-25 Double-Gap Magnetic Flux Concentrator Design for High-Sensitivity Magnetic Tunnel Junction Sensors Hu, Jiafei Ji, Minhui Qiu, Weicheng Pan, Long Li, Peisen Peng, Junping Hu, Yueguo Liu, Huiyan Pan, Mengchun Sensors (Basel) Article 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. MDPI 2019-10-15 /pmc/articles/PMC6832420/ /pubmed/31619009 http://dx.doi.org/10.3390/s19204475 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Hu, Jiafei
Ji, Minhui
Qiu, Weicheng
Pan, Long
Li, Peisen
Peng, Junping
Hu, Yueguo
Liu, Huiyan
Pan, Mengchun
Double-Gap Magnetic Flux Concentrator Design for High-Sensitivity Magnetic Tunnel Junction Sensors
title Double-Gap Magnetic Flux Concentrator Design for High-Sensitivity Magnetic Tunnel Junction Sensors
title_full Double-Gap Magnetic Flux Concentrator Design for High-Sensitivity Magnetic Tunnel Junction Sensors
title_fullStr Double-Gap Magnetic Flux Concentrator Design for High-Sensitivity Magnetic Tunnel Junction Sensors
title_full_unstemmed Double-Gap Magnetic Flux Concentrator Design for High-Sensitivity Magnetic Tunnel Junction Sensors
title_short Double-Gap Magnetic Flux Concentrator Design for High-Sensitivity Magnetic Tunnel Junction Sensors
title_sort double-gap magnetic flux concentrator design for high-sensitivity magnetic tunnel junction sensors
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6832420/
https://www.ncbi.nlm.nih.gov/pubmed/31619009
http://dx.doi.org/10.3390/s19204475
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