Differentiation between Strain and Charge Mediated Magnetoelectric Coupling in La0.7Sr0.3MnO3/Pb(Mg1/3Nb2/3)d0.7^Ti0.3O3(001)

Published

June 17, 2020

Author(s)

T. Bhatnagar-Schoffmann, Emmanuel Kentzinger, A. Sarkar, P. Schoffmann, Q. Lan, L. Jin, A. Kovacs, Alexander Grutter, Brian Kirby, R. Beerwerth, M. Waschk, Annika Stellhorn, U. Rucker, R. E. Dunin-Borkowski, Th. Bruckel

Abstract

Magnetoelectric (ME) coupling in La_0.7Sr_0.3MnO₃/Pb(Mg_1/3Nb_2/3)d0.7^Ti_0.3O₃ (LSMO/PMN-PT (001)) has been probed in the past years to identify the underlying mechanism behind it. PMN-PT, which is well known for its excellent piezoelectric properties, also exhibits ferroelectricity. This motivates our interest to differentiate which effect is dominant for this 'Voltage control of magnetism'. Here, we present results for the magnetoelectric coupling at different temperatures: 300 K and 80 K. In this article we discuss and explain, how the nature of ME coupling is influenced by different parameters such as magnetic field, electric field, directional dependence (hard axis, easy axis) and temperature. Owing to large lattice mismatch between LSMO and PMN-PT, the strain-mediated coupling is strongly prevalent, however the change in strain behaviour from butterfly loop to linear loop is observed as a function of temperature. ME measurements are performed along hard axis [100] and easy axis [110] of LSMO in the presence of remanent magnetic field which showcases the pure influence of electric field on the system, resulting in a combination of strain- and charge-mediated coupling. The magnetic depth profile is probed by Polarized Neutron Reflectometry (PNR) as a function of electric field which demonstrates the existence of an interlayer with reduced Nuclear Scattering Length Density (NSLD) and reduced Magnetic Scattering Length Density (MSLD) at the interface. From Transmission Electron Microscopy (TEM), stoichiometric variations are observed due to the presence of Mn₃O₄ particles at the interface.

Citation

New Journal of Physics

Volume

23

Issue

6

Pub Type

Journals

Keywords

magnetism

Citation

Bhatnagar-Schoffmann, T. , Kentzinger, E. , Sarkar, A. , Schoffmann, P. , Lan, Q. , Jin, L. , Kovacs, A. , Grutter, A. , Kirby, B. , Beerwerth, R. , Waschk, M. , Stellhorn, A. , Rucker, U. , Dunin-Borkowski, R. and Bruckel, T. (2020), Differentiation between Strain and Charge Mediated Magnetoelectric Coupling in La_0.7Sr_0.3MnO₃/Pb(Mg_1/3Nb_2/3)d0.7^Ti_0.3O₃(001), New Journal of Physics (Accessed April 19, 2024)