Regensburg 2013 – scientific programme

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DF: Fachverband Dielektrische Festkörper

DF 2: Multiferroics 1 (jointly with MA,DS,KR,TT)

DF 2.4: Talk

Monday, March 11, 2013, 10:15–10:30, H3

Electrostatic tuning of large-distance sputtered LSMO/PZT heterostructures — •Philipp Moritz Leufke, Ajay Kumar Mishra, Wang Di, Robert Kruk, and Horst Hahn — Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany

In order to obtain a physical picture and quantitative characteristics of a magnetoelectric coupling at ferromagnetic/ferroelectric interfaces, epitaxial La_0.87Sr_0.13MnO₃/Pb(Zr,Ti)O₃ (LSMO/PZT) heterostructures were deposited by large-distance magnetron sputtering[1,2]. The remarkably high lateral uniformity achieved in such films allowed for a ferroelectric device area of more than 6 mm².

This has enabled for the first time in-situ SQUID measurements of the magnetic response to the systematically varied remanent ferroelectric polarization. Temperature dependence of the magnetic modulation upon charging and the magnetic response to the ferroelectric stimulation indicates a field-effect dominated coupling mechanism and generally confirms the concept of electrostatic hole (h⁺) doping of LSMO.

For small charge modulations at low temperature, a linear tuning coefficient of ≈ 3.6 µ_B/h⁺ has been determined. This suggests the activation of an antiferromagnetic coupling, even for very small surface charge densities. Simultaneously a shift in the magnetic transition temperature at higher surface charge concentration indicates the presence of a ferromagnetic phase at the LSMO/PZT interface.

[1] P. M. Leufke et al., Thin Solid Films 520, 5521 (2012).

[2] P. M. Leufke et al., AIP Advances 2, 032184 (2012).