La0.7Sr0.3MnO3 thin films for sensing applications

  • Dipartimento di Fisica - Aula 605
  • Seminario

Relatori

Laurence Méchin
Groupe de recherche en Informatique, Image, Automatique et Instrumentation de Caen Normandie Univ, UNICAEN, ENSICAEN, CNRS, GREYC

Dettagli

La0.7Sr0.3MnO3 (LSMO) is a ferromagnetic material with a Curie temperature of about 360 K, which shows a metal to insulator transition above room temperature.

In a first part, I will show how these films could be advantageously used for Anisotropic Magnetoresistance (AMR) as targeted in the byAxon FET European project started in January 2017. We previously showed that substrates with various orientations can induce different in-plane magnetic anisotropies [1, 2,3]. We are now investigating the relationship between magnetic anisotropy and AMR in order to enhance the performance of sensors [4].

The second part will focus on the use of LSMO for uncooled bolometers. A bolometer is a thermal radiation detector, in which the temperature rise due to the absorption of heat from incoming radiation causes a change in its electrical resistance R. I will show that high sensitive bolometers can be obtained thanks to the very low thermal conductance that was achieved after etching of the silicon substrate by reactive ion etching under the LSMO thin films [5]. 

In conclusion I will show the preliminary developments towards the fabrication of new suspended geometries, which are intended to study and use the effect of strain on magnetic and electrical properties of LSMO thin films.

References:
[1] P. Perna, et al., J. Appl. Phys. 110 013919 (2011)
[2] P. Perna, et al., New Journal of Physics 12 103033 (2010)
[3] D. Fadil, et al., J. Appl. Phys. 112 013906 (2012)
[4] P. Perna, et al., Adv. Funct. Mater. 2017, 1700664 (2017)
[5] S. Liu, et al., Microelectronic Engineering Vol. 111, 101-104 (2013)