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Sensors 2016, 16(5), 650; doi:10.3390/s16050650

A Magnetoresistive Tactile Sensor for Harsh Environment Applications

1
Computer, Electrical and Mathematical Sciences and Engineering Division (CEMSE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
2
INESC-Microsystems and Nanotechnologies (INESC-MN), Rua Alves Redol, 9, Lisbon 1000-029, Portugal
3
Instituto Superior Técnico IST, Physics Department, Universidade de Lisboa, Lisbon 1049-001, Portugal
*
Author to whom correspondence should be addressed.
Academic Editor: Andreas Hütten
Received: 4 April 2016 / Revised: 30 April 2016 / Accepted: 3 May 2016 / Published: 7 May 2016
(This article belongs to the Special Issue Magnetoresistive Sensors under Extreme Conditions)
View Full-Text   |   Download PDF [3671 KB, uploaded 7 May 2016]   |  

Abstract

A magnetoresistive tactile sensor is reported, which is capable of working in high temperatures up to 140 °C. Hair-like bioinspired structures, known as cilia, made out of permanent magnetic nanocomposite material on top of spin-valve giant magnetoresistive (GMR) sensors are used for tactile sensing at high temperatures. The magnetic nanocomposite, consisting of iron nanowires incorporated into the polymer polydimethylsiloxane (PDMS), is very flexible, biocompatible, has high remanence, and is also resilient to antagonistic sensing ambient. When the cilia come in contact with a surface, they deflect in compliance with the surface topology. This yields a change of the GMR sensor signal, enabling the detection of extremely fine features. The spin-valve is covered with a passivation layer, which enables adequate performance in spite of harsh environmental conditions, as demonstrated in this paper for high temperature. View Full-Text
Keywords: magnetic nanocomposite; giant magnetoresistance; high temperature; harsh environment; nanowires; cilia; tactile sensor; spin-valve magnetic nanocomposite; giant magnetoresistance; high temperature; harsh environment; nanowires; cilia; tactile sensor; spin-valve
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Alfadhel, A.; Khan, M.A.; Cardoso, S.; Leitao, D.; Kosel, J. A Magnetoresistive Tactile Sensor for Harsh Environment Applications. Sensors 2016, 16, 650.

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