Substrate-induced magnetic anisotropy in La0.7Sr0.3MnO3 epitaxial thin films grown onto (110) and (1 8) SrTiO3 substrates

Paolo Perna (1) , C. Rodrigo (2, 3) , Ernesto Jimenez (2, 3) , N. Mikuszeit (2, 3) , F. J. Teran (2) , Laurence Méchin (4) , J. Camarero (2, 3) , R. Miranda (2, 3)

1 électronique
2 Instituto IMDEA Nanociencia [Madrid]
3 FMC - Departamento de Fisica de la Materia Condensada [Madrid]
4 Equipe Electronique - Laboratoire GREYC - UMR6072

We show a detailed magneto-optical Kerr study at room temperature of well characterized epitaxial La0:7Sr0:3MnO3 (LSMO) thin lms grown onto (110) and (1 18) SrTiO3 substrates. The lms present a well-de ned uniaxial (two-fold) magnetic anisotropy ascribed to substrate-induced anisotropy. In particular, the in-plane uniaxial anisotropy in the(110)-oriented LSMO lms originates from the existence of elongated in-plane [001]-oriented structures. Similar elongated structures, parallel to the [110] crystallographic direction, are found for LSMO lms grown on (1 18) STO surfaces. In all lms, such a uniaxial magnetic anisotropy is characterized by an easy axis lying along the elongated structures. Furthermore, the vectorial-resolved hysteresis loops as a function of the in-plane applied eld direction are interpreted in terms of rotation and propagation and nucleation of magnetic domains processes. Our results demonstrate the tailoring of magnetic anisotropy by exploiting the substrate-induced anisotropy in epitaxial thin films.

Domaines: Sciences de l'ingénieur [physics]; Micro et nanotechnologies/Microélectronique

Paolo Perna, C. Rodrigo, Ernesto Jimenez, N. Mikuszeit, F. J. Teran, et al.. Substrate-induced magnetic anisotropy in La0.7Sr0.3MnO3 epitaxial thin films grown onto (110) and (1 8) SrTiO3 substrates. JEMS 2010 (Joint European Magnetic Symposia), Aug 2010, Kracovie, Poland. pp.303 012058. ⟨hal-00976989⟩