Abstract: The present invention relates to a magnetometric device that measures the magnetic properties of a sample and whose most notable characteristic lies in that it is portable and highly precise, and can be used for the detection of a magnetic signal from nanostructures exposed to a fixed external magnetic field of excitation, of a unique value, it not being possible to alter the external magnetic field. The fixed external field can only be altered by modifying the device by means of exchanging the permanent magnets; however, once the device is sealed, this field does not vary. Different quantities of the same magnetic material may be placed in the sample holder, increasing the measurement signal; the present device can therefore determine the magnetic mass being measured following calibration of the magnetic material employed.

Abstract: The invention relates to a system comprising superparamagnetic or anhysteretic nanoparticles (NPs) functionalised with an antibody, and a thin-film-type substrate of metal or an oxide thereof, functionalised with the same antibody; and to a method for detecting a biological analyte, such as a cell, protein, microorganism or similar, preferably a pathogenic microorganism, and even more preferably Listeria.

Abstract: The present invention relates to a method for nanomodulating metal films by means of high-vacuum cathode sputtering of metals, and to stencils of anodized Al. As an example of the use of these nanomodulated metal films, the synthesis or production of a magnetically weak film by means of cathode sputtering, which film can he used as a magnetic field sensor, and a metal nanomodulated stencil are analyzed.