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Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 75: Multiferroics II (jointly with DF, DS, KR, MA)

TT 75.4: Talk

Wednesday, March 18, 2015, 16:00–16:15, EB 107

Massive magnetoelectric modulation of the magnetic anisotropy in an epitaxial La0.7Sr0.3MnO3/PMN-PT heterostructure — •Martin Wahler1, Sujit Das1, Kathrin Dörr1, and Georg Schmidt1,21Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, 06099 Halle (Saale), Germany — 2Interdisziplinäres Zentrum für Materialwissenschaften, Martin-Luther-Universität Halle-Wittenberg, 06099 Halle (Saale), Germany

We use ferromagnetic resonance (FMR) to investigate the strain induced change of the in-plane magnetic anisotropy of an epitaxial ferromagnetic oxide layer on a piezoelectric substrate. The samples consist of 20 nm thick La0.7Sr0.3MnO3 layers on two different substrates, namely Pb(Mg1/3Nb2/3)0.72Ti0.28O3 (PMN-PT) (001) and (110) single crystals. The two substrates induce either isotropic or anisotropic in-plane strain, respectively. For La0.7Sr0.3MnO3 on (001) PMN-PT substrate, it has already been demonstrated by SQUID magnetometry that the Curie-temperature and saturation magnetization can be changed by applying an electric field normal to the sample plane [1]. Here we show that for the same substrate orientation there is a small but significant change in FMR resonance fields along the directions of the magnetic easy axes. For the (110) substrate, however, a massive shift of the resonance fields is observed, resulting in a change of the uniaxial anisotropy of more than 0.5 kOe for an applied electric field of 12 kV cm−1. All measurements are carried out at a temperature of 120 K.
C. Thiele et al., Phys. Rev. B, 75 054408 (2007)

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