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MA: Fachverband Magnetismus

MA 35: Magnetic Oxides and Shape Memory Alloys (jointly with MM)

MA 35.8: Vortrag

Donnerstag, 14. März 2013, 11:15–11:30, H23

Interface reaction in LSMO-metal hybrid structures — •Nico Homonnay¹, Christian Eisenschmidt¹, Martin Wahler¹, Jo Verbeeck², Gustav Van Tendeloo², and Georg Schmidt¹ — ¹Martin-Luther-Universität Halle-Wittenberg, Halle (Saale), Germany — ²University of Antwerp, Antwerpen, Belgium

The ferromagnetic oxide La_0.7Sr_0.3MnO₃ (LSMO) is expected to have a high spin polarization. It can thus be interesting for oxide-metal hybrid structures for spintronics applications [1]. In these structures, however, possible degradation of the crystalline LSMO at interfaces to metals can be of utmost importance for transport structures based on giant magnetoresistance or tunnelling magnetoresistance. Here we present a study of in-situ prepared interfaces between LSMO and various metals. LSMO films are grown by pulsed laser deposition. The samples are then transferred in UHV either into a sputtering chamber or into an evaporation system where a thin metal layer is deposited (gold, platinum, copper, tantalum, chromium or titanium). Structural characterization is done by X-ray diffraction and transmission electron microscopy, while the magnetic properties are determined using a SQUID VSM. For a number of metals we observe a strong degradation of the crystalline quality or even a complete loss of crystallinity. In these samples also the magnetization is lost almost completely. Only for noble metals like Au or Pt both magnetic and structural integrity is preserved. These interface reactions are not observed if the sample is left in air for several days prior to metal evaporation. This work was supported by the EU project IFOX. [1] Park et al., Nature 392 (1998)