C.r.f. Societa Consortile Per Azioni

Antonio Ruotolo

Daniele Pullini

Piermario Repetto

Gianfranco Innocenti

A thin-film device for detecting the variation of intensity of physical quantities, in particular a magnetic field, in a continuous way, comprises an electrical circuit including one or more sensitive elements, which are designed to vary their own electrical resistance as a function of the intensity of a physical quantity to be detected. One or more of the sensitive elements comprise at least one nanoconstriction, and the nanoconstriction comprises at least two pads made of magnetic material, associated to which are respective magnetizations oriented in directions substantially opposite to one another and connected through a nanochannel. The nanochannel is able to set up a domain wall that determines the electrical resistance of the nanoconstriction as a function of the position, with respect to the nanochannel, of the domain wall formed in the sensor device. At least one cross section of the nanochannel is configured so as to present a variable extension along one or more axes as a function of different values of the physical quantity to be detected.

Thin film device for detection of physical quantities

Described herein is a magnetoresistive network responsive to a magnetic field of the type comprising a plurality of magnetoresistive elements. According to the invention, the one or more magnetoresistive elements comprise at least one magnetoresistive element in the form of nanoconstriction, the nanoconstriction comprising at least two pads made of magnetic material, associated to which are respective magnetizations oriented in directions substantially opposite to one another and connected through a nanochannel, the nanochannel being able to set up a domain wall that determines an electrical resistance of the nanoconstriction as a function of the position, with respect to said nanochannel, of said domain wall formed in said sensor device.

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Orbassano, Italy

Antonio Ruotolo