The
converse magnetoelectric (ME) coupling of a La0.7Sr0.3MnO3 (LSMO) thin film, deposited on piezoelectric
Pb(Mg1/3Nb2/3)O3–PbTiO3 (PMN–PT) single crystal substrate by the pulsed laser
deposition (PLD) technique, was investigated by magneto-optical Kerr
effect (MOKE) system. Because of the piezoelectric nature of the PMN–PT,
the strain status of the LSMO thin film is tunable by the electric
field applied on the substrate, as it is well-known that the Manganite
thin film has very strong electron–phonon interaction; thus,
the magnetic property change as a function of external electric field
can be realized. The change of the Kerr signal of LSMO film upon applying
direct current (DC) voltage to the PMN–PT single crystal was
recorded. In particular, the voltage-induced change of the Kerr signal
in the LSMO by applying the alternative current (AC) actuation voltage
bias to the PMN–PT single crystal can be in situ recorded without
external magnetic fields. The gained Kerr signal versus voltage loop
basically tracks the electromechanical strain curve of the PMN–PT
single crystal, distinctly certifying that a converse ME coupling
in Manganite/piezoelectric heterostructures is mediated by strain
rather than the interfacial effect.
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