학술논문
High-Performance Implantable Sensors based on Anisotropic Magnetoresistive La0.67Sr0.33MnO3for Biomedical Applications
Document Type
Article
Author
Vera, Arturo; Martínez, Isidoro; Enger, Luiz Guilherme; Guillet, Bruno; Guerrero, Rubén; Diez, José Manuel; Rousseau, Olivier; Lam Chok Sing, Marc; Pierron, Victor; Perna, Paolo; Hernández, Jaime J.; Rodríguez, Isabel; Calaresu, Ivo; Meier, Anja; Huck, Carmen; Domínguez-Bajo, Ana; González-Mayorga, Ankor; López-Dolado, Elisa; Serrano, María C.; Ballerini, Laura; Pérez, Lucas; Miranda, Rodolfo; Flament, Stéphane; González, María Teresa; Méchin, Laurence; Camarero, Julio
Source
ACS Biomaterials Science & Engineering; February 2023, Vol. 9 Issue: 2 p1020-1029, 10p
Subject
Language
ISSN
23739878
Abstract
We present the design, fabrication, and characterization of an implantable neural interface based on anisotropic magnetoresistive (AMR) magnetic-field sensors that combine reduced size and high performance at body temperature. The sensors are based on La0.67Sr0.33MnO3(LSMO) as a ferromagnetic material, whose epitaxial growth has been suitably engineered to get uniaxial anisotropy and large AMR output together with low noise even at low frequencies. The performance of LSMO sensors of different film thickness and at different temperatures close to 37 °C has to be explored to find an optimum sensitivity of ∼400%/T (with typical detectivity values of 2 nT·Hz–1/2at a frequency of 1 Hz and 0.3 nT·Hz–1/2at 1 kHz), fitted for the detection of low magnetic signals coming from neural activity. Biocompatibility tests of devices consisting of submillimeter-size LSMO sensors coated by a thin poly(dimethyl siloxane) polymeric layer, both in vitroand in vivo, support their high suitability as implantable detectors of low-frequency biological magnetic signals emerging from heterogeneous electrically active tissues.