Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 64: Poster 1

MA 64.32: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-EG

Spin Hall magnetorestiance in Pt/La_0.875Sr_0.125MnO₃ heterostructures — •Sarah Gelder^1,2, Stephan Geprägs¹, and Rudolf Gross^1,2,3 — ¹Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — ²Physik-Department, TU München, 85748 Garching, Germany — ³Nanosystems Initiative Munich, 80799 München, Germany

The interconversion of spin and charge currents via the (inverse) spin Hall effect in normal metal (NM)/ferromagnetic insulator (FMI) bilayers results in the spin Hall magnetoresistance (SMR). In the past years, the SMR was extensively investigated in the prototype bilayer system platinum/yttrium iron garnet (Pt/YIG). Here, we use La_1−xSr_xMnO₃ (LSMO) with low doping level x=0.125 as the ferromagnetic insulator, exhibiting a T_c of 180K and phase transitions at 270K and at 150K. This material allows further insight into the dependence of the SMR on the magnetic properties of the ferromagnetic material. We have fabricated Pt/LSMO bilayers on (100)-oriented SrTiO₃ substrates by pulsed laser deposition of LSMO and subsequent electron beam evaporation of Pt. The high crystalline quallity as well as the magnetic properties of our LSMO thin films are confirmed by X-ray diffraction and SQUID magnetometry measurements. We performed angle-dependent magnetoresistance (ADMR) measurements, providing the SMR amplitude as a function of temperature and magnetic field strength . We correlate the experimental findings with the magnetic properties of LSMO. This work is supported by the DFG via SPP 1538.