Low-noise anisotropic magnetoresistance sensing at human body temperature: unveiling the optimal doping in La 1− x Sr x MnO 3 films
Year: 2025
Type: article
Abstract: Low-field anisotropic magnetoresistance (AMR) sensors based on epitaxial La 1− x Sr x MnO 3 (LSMO) thin films combine ultra-low noise, good interplay between sensitivity and detectivity, and straightforward fabrication, offering a compelling alternative to giant and tunnel magnetoresistance technologies. Here, by tuning Sr doping ( x = 0.15–0.45) of LSMO films grown epitaxially on 4° miscut (001)-oriented SrTiO 3 substrates, we achieve fine control of performance parameters tailored to match biomedical environments operating at tightly regulated temperatures. We resort to shape-induced uniaxial magnetic anisotropy and Wheatstone bridge structures to suppress noise and isolate the AMR signal. Temperature-dependent characterization reveals that devices with x = 0.35 deliver optimal sensitivity and lowest electronic noise at 310 K (human body temperature), highlighting their strong potential for biomedical sensing applications.
Authors: Raul Solis Leon, Ines Garcia Manuz, Sandeep Kumar Chaluvadi, Victor Pierron, Vincent Polewczyk, Aleksandr Yu Petrov, Giovanni Vinai, Alain Pautrat, Fernando Ajejas, Bruno Guillet, Stéphane Flament, Pasquale Orgiani, Paolo Perna, Laurence Mechin
Institutions: Centre National de la Recherche Scientifique, École Nationale Supérieure d'Ingénieurs de Caen, IMDEA Nanoscience, Normandie Université, GREYC, Universidad Autónoma de Madrid, Université de Caen Normandie, Istituto Officina dei Materiali, Laboratoire de Cristallographie et Sciences des Matériaux
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
Awards: G118358012, G3566784530, G8782832681
OpenAlex ID: W4415678266