Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 51: Magnetism Poster B

MA 51.59: Poster

Donnerstag, 4. April 2019, 15:00–18:00, Poster C

Reduction of dead layer in La_0.7Sr_0.3MnO₃ at the (SrO)₂ buffered interface with SrTiO₃ — •Vitaly Bruchmann-Bamberg¹, Alexandr Belenchuk², Yury Khaydukov^3,4, Vladimir Roddatis⁵, and Vasily Moshnyaga¹ — ¹I. Physik. Inst., G.-A.-Universität Göttingen, Friedrich-Hund-Pl. 1, 37077 Göttingen — ²IIEN, Academy of Sciences of Moldova, str. Academiei 3/3, MD-2028 Kishinev, Republic of Moldova — ³Max Planck Institute for Solid State Research, 70569 Stuttgart — ⁴Max Planck Society Outstation at the Heinz Maier-Leibnitz Zentrum (MLZ), 85748 Garching — ⁵Institut für Materialphysik, G.-A.-Universität Göttingen, Friedrich-Hund-Pl. 1, 37077 Göttingen

Magnetic tunnel junctions (MTJ) formed of La_0.7Sr_0.3MnO₃ (LSMO) and SrTiO₃ (STO) show very large tunneling magnetorisistance at low temperatures [1]. However, the TMR effect is negligible at room temperature due to the presence of magnetic “dead” layers at the interfaces.

The LSMO/STO and LSMO/(SrO)₂/STO (Ruddlesden-Popper buffered) superlattices and ultrathin films were grown by means of metalorganic aerosol deposition technique and studied by polarized neutron reflectometry. A reduction of the dead layer was found at the buffered LSMO interfaces in contrast to the unbuffered LSMO at room temperature. An improvement of the MTJ performance of the LSMO-(SrO)₂-STO heterostructures is expected.

We gratefully acknowledge the financial support provided by the DFG within the SFB 1073 and the FRM II at the MLZ Garching.

[1] Werner, R. et al., Applied Physics Letters 98, 162505 (2011)