Nicolas, Hugo
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Low-coercivity perpendicular spin transfer torque magnetic tunnel junctions as nanoscale magnetic sensors
2023-09, Nicolas, Hugo, Sousa, Ricardo C., Mora-Hernández, Ariam, Prejbeanu, Ioan-Lucian, Hebrard, Luc, Kammerer, Jean-Baptiste, Pascal, Joris
This paper presents the use of the spin transfer torque effect in perpendicular magnetic tunnel junctions to operate the devices as magnetic sensors. The junctions, specifically designed for sensing applications exhibit close to low-coercivity, allowing the sensitivity to be as high as 25 mV/mT for a large dynamic range of 20 mT. In addition, the junctions have diameters ranging from 20 to 100 nanometers, making them among the smallest magnetic sensing elements ever reported to our knowledge. A single operational amplifier operates the junction and outputs a voltage proportional to the external magnetic field. This paper opens the way to a monolithic integration of both the conditioning electronics and the perpendicular magnetic tunnel junction.
A magnetic sensor based on a nanometric spin transfer torque magnetic tunnel junction suitable for monolithic integration
2022, Nicolas, Hugo, Pascal, Joris, Hebrard, Luc, Kammerer, Jean-Baptiste, Sousa, Ricardo C., Mora-Hernandez, Ariam, Prejbeanu, Ioan-Lucian
Experimental assessment of the performances of an anisotropic magnetoresistive sensor after exposure to strong magnetic fields
2023, Vergne, Céline, Nicolas, Hugo, Madec, Morgan, Hemm-Ode, Simone, Guzman, Raphael, Pascal, Joris
On-chip magnetometers are already integrated within long-term implants such as cardiac implantable electronic devices. They are also good candidates to be integrated within the next generations of brain stimulation electrodes to provide their position and orientation. In all cases, long-term implants are expected to be at least certified as MRI conditional. We investigated the resilience to the exposure to 3 T and 7 T of an anisotropic magnetoresistive sensor integrating a set/reset function. The sensitivity, non-linearity, and offset of a batch of 63 identical sensors were not affected by the exposure. These preliminary results provide new insights on the usability of magnetoresistive sensors for biomedical applications requiring MRI conditionality.
A magnetic camera to assess the risk of magnetic interaction between portable electronics and cardiac implantable electronic devices
2022-06, Quirin, Thomas, Vergne, Céline, Féry, Corentin, Badertscher, Patrick, Nicolas, Hugo, Mannhart, Diego, Osswald, Stefan, Kuhne, Michael, Sticherling, Christian, Madec, Morgan, Hébrard, Luc, Knecht, Sven, Pascal, Joris