Regensburg 2013 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 16: Poster I

MA 16.37: Poster

Dienstag, 12. März 2013, 10:30–13:30, Poster D

Exchange Bias in all-Manganite La_0.7Sr_0.3MnO₃ / SrMnO₃ / La_0.7Sr_0.3MnO₃ Trilayers — •Markus Jungbauer, Sebastian Hühn, Markus Michelmann, Camillo Ballani, and Vasily Moshnyaga — I. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen

A great interest to exchange bias phenomenon in artificially layered thin films is caused by fundamental importance of this well-known but still controversially explained effect as well as by its promising applicability in spintronics (TMR and multiferroics). We studied exchange bias for all-manganite La_0.7Sr_0.3MnO₃ / SrMnO₃ / La_0.7Sr_0.3MnO₃ trilayers with ferromagnetic La_0.7Sr_0.3MnO₃ (LSMO) and G-type antiferromagnetic SrMnO₃ (SMO) layers, grown on (001) SrTiO₃ substrates by metalorganic aerosol deposition (MAD). The field shift of the magnetic hysteresis loop H_E and the coercitivity H_C decay exponentially with temperature, vanishing at T=100   K . H_E exhibits a global maximum as a function of the SMO interlayer thickness at t_SMO ≈ 4.5   nm . We argue that the EB behaviour can be explained by the interplay of a spinglass state at the interface and theoretically proposed mechanism based on the Dzyaloshinskii-Moriya interaction¹. Financial support of EU via FP7 (IFOX) is acknowledged.
[1] S. Dong, et al., Phys. Rev. Lett. 103, 127201 (2009)