A Magnetoresistive Tactile Sensor for Harsh Environment Applications

Ahmed Alfadhel, Mohammed Zahed Mustafa Khan, Susana Cardoso, Diana Leitao, Jürgen Kosel

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

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.
Original languageEnglish (US)
Pages (from-to)650
JournalSensors
Volume16
Issue number5
DOIs
StatePublished - May 7 2016

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