Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 13: Poster Ia: Electron Theory (1); Magnetic Imaging (2,3); Thin Films (4-25); MSMA (26-33); Magn. Semiconductors (34-42); Magn. Half Metals and Oxides (43-60)

MA 13.23: Poster

Dienstag, 24. März 2009, 10:15–13:00, P1A

Magneto-elastic coupling in LaCoO₃ thin films — •Erhan Arac^1,2, Dirk Fuchs¹, Fadi El-Hallak³, Rudolf Schneider¹, and Hilbert von Löhneysen^1,2 — ¹Forschungszentrum Karlsruhe, Institut für Festkörperphysik, 76021 Karlsruhe, Germany — ²Physikalisches Institut, Universität Karlsruhe, 76128 Karlsruhe, Germany — ³1. Physikalisches Institut, Universität Stuttgart, 70550 Stuttgart, German

The magnetization of epitaxial LaCoO₃ thin films with respect to magnitude and orientation of the strain is investigated. The magnitude of the epitaxial tensile strain is varied by the growth of thin films on (001) oriented SrLaAlO₄, SrLaGa₄, (LaAlO₃)₀.3(Sr₂AlTaO₆)₀.7 (LSAT) and SrTiO₃ single crystal substrates while the orientation is changed by the growth on (001),(110) and (111) oriented LSAT substrates by pulsed laser deposition (PLD). The magneto-elastic constant B₁ is determined by “area method“. The negative sign implies that in-plane magnetization is favoured which is convenient with obtained in-plane hysteresis loops of (001) samples. Moreover, magnetic anisotropy measurements of (001) and (110) samples revealed 4-fold and 2-fold symmetry. The uniaxial magnetic anisotropy in (110) film can be explained by the dominance of the stress anisotropy over magneto-crystalline anisotropy effects.