Magnetoresistive thick film sensor for linear displacements

B. Morten, G. De Cicco, M. Prudenziati, A. Masoero, G. Mihai

Risultato della ricerca: Contributo su rivistaArticolo in rivistapeer review

Abstract

A new thick film material has been developed starting from Ni and Co powders in the ratio Ni:Co = 3:1. The thermal treatment (in N2, up to 950 °C) of the metal films deposited on glazed alumina enables the in situ formation of the NiCo alloy. The films as created exhibit a high longitudinal (current I parallel to the field B) magnetoresistive response with ΔR/R ≈4% at 1.2 kGauss, and a negligible transverse one. The temperature coefficient of resistance (TCR) is ≈2700 ppm °C−1. These properties make the new material superior, from the point of view of magnetoresistive applications, to the Ni-based currently available thick film conductors. Contactless sensors for linear displacements have been created with the sensor's structure enclosing either Ni-based and Ni/Co-based meanders, having two magnetoresistive elements on each side of the substrate. This paper compares the magnetoresistive and thermoresistive properties of Ni and Ni/Co-based layers as well as the performances of the sensors in the range −20 to 120 °C.

Lingua originaleInglese
pagine (da-a)261-265
Numero di pagine5
RivistaSensors and Actuators A: Physical
Volume46
Numero di pubblicazione1-3
DOI
Stato di pubblicazionePubblicato - 1995
Pubblicato esternamente

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