Patent ID: 7615995

Claim:
A thin-film device for detecting the variation of intensity of physical quantities, in particular a magnetic field, in a continuous way, comprising an electrical circuit including one or more sensitive elements, said device being designed to vary its own electrical resistance as a function of the intensity of the physical quantity to be detected, said one or more sensitive elements comprising at least one nanoconstriction, said 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, said nanochannel being able to set up a domain wall that determines the electrical resistance of said nanoconstriction as a function of the dimensions of said domain wall formed in said sensor device, wherein at least one cross section of said nanochannel is configured so as to present an amplitude variable along one or more axes as a function of different values of said physical quantity to be detected, and wherein the device is capable of detecting the variation of intensity of physical quantities, in particular a magnetic field, in a continuous way.