Regensburg 2013 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 26: Magnetic Thin Films I of 2
MA 26.7: Vortrag
Mittwoch, 13. März 2013, 11:15–11:30, H3
Stoichiometric variations of [La2/3Sr1/3]n± 1MnnO3n± 1/SrTiO3 — •Alexandra Steffen1, Sabine Pütter1, Jürgen Schubert3, Stefan Mattauch1, and Thomas Brückel1,2 — 1Jülich Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbH, Outstation at FRM II, Lichtenbergstr. 1, 85747 Garching — 2Jülich Centre for Neutron Science JCNS und Peter Grünberg Institut PGI, JCNS-2, PGI-4: Scattering Methods, Forschungszentrum Jülich GmbH, 52425 Jülich — 3Peter Grünberg Institut PGI, PGI-9: Semiconductor Nanoelectronics, Forschungszentrum Jülich GmbH, 52425 Jülich
Transition metal oxide thin films show a huge variety of fascinating phenomena like ferromagnetism at interfaces of non-magnetic materials as found in SrTiO3/KTaO3[1]. By oxide Molecular Beam Epitaxy we achieve high quality epitaxial films with exact composition control. Here, we compare single layers of [La2/3Sr1/3]1Mn1O3, [La2/3Sr1/3]2Mn3O8 and [La2/3Sr1/3]3Mn2O7 on SrTiO3. The stoichiometry was adjusted in-situ via quarz-crystal balance and cross-checked with RBS while the growth mode was monitored via RHEED. By LEED, XRR and XRD, the crystalline sample quality was studied. The magnetic properties were determined via SQUID. We report investigations of the depth-dependent distribution of magnetic moments in these layers via neutron reflectometry. At TREFF@FRM II we quantified the thickness of the magnetic dead layer[2,3] at the interface.
[1] R. Oja et al., Phys. Rev. Lett. 109, 127207 (2012) [2] M. Angeloni et a., J. Appl. Phys. 96, 6387 (2004) [3] M. Huijben et al., Phys. Rev. B, 78, 094413 (2008)