Influence of strain on the magnetization and magnetoelectric effect inLa0.7A0.3MnO3∕PMN−PT(001)(A=Sr,Ca)
By C. Thiele, Kathrin Dörr, O. Bilani, J. Rödel, L. Schultz. 2006
482 citations recorded by the source corpus.
We investigate the influence of a well-defined reversible biaxial strain <=0.12 % on the magnetization (M) of epitaxial ferromagnetic manganite films. M has been recorded depending on temperature, strain and magnetic field in 20 - 50 nm thick films. This is accomplished by reversibly compressing the isotropic in-plane lattice parameter of the rhombohedral piezoelectric 0.72PMN-0.28PT (001) substrates by application of an electric field E <= 12 kV cm-1. The magnitude of the total variable in-plane strain has been derived. Strain-induced shifts of the ferromagnetic Curie temperature (Tc) of up to 19 K were found in La0.7Sr0.3MnO3 (LSMO) and La0.7Ca0.3MnO3 films and are quantitatively analysed for LSMO within a cubic model. The observed large magnetoelectric coupling coefficient alpha=mu0 dM/dE <= 6 10-8 s m-1 at ambient temperature results from the strain-induced M change in the magnetic-film-ferroelectric-substrate system. It corresponds to an enhancement of mu0 DeltaM <= 19 mT upon biaxial compression of 0.1 %. The extraordinary large alpha originates from the combination of three crucial properties: (i) the strong strain dependence of M in the ferromagnetic manganites, (ii) large piezo-strain of the PMN-PT substrates and (iii) effective elastic coupling at the film-substrate interface.
Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/34661a779dab22412fc41f606496b363128549b9
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Citations in the corpus
- Magnetic Oxide Heterostructures (2014, background): “1% shifted TC by 19 K, illustrating the sensitivity of magnetism to subtle structural modifications (65).”
- Oxide Spintronics (2007, background): “Electric modulations of the magnetic properties of the ferromagnet by the ferroelectric or piezoelectric layer have been reported [308], [309].”