Abstract
The magnetic properties of epitaxial BaTiO3/La0.76Sr0.24MnO3/BaTiO3 (BTO/LSMO/BTO) heterostructures have been studied using magneto-optic Kerr effect (MOKE) technique. Both longitudinal and polar MOKE were probed as a function of magnetic field and temperature (in the range between 80 and 320 K) for epitaxial films of BTO/LSMO/BTO and LSMO grown on TiO2-terminated SrTiO3 (001) substrates by pulsed laser deposition technique. The LSMO film without the BTO layers exhibits nearly square field-dependent MOKE hysteresis loops with low saturation fields below a bulk-like Curie temperature (TC) of ∼ 350K. In contrast, the film with the BTO layers exhibits a significantly suppressed TC of 155 K, accompanied by significantly enhanced coercive fields and perpendicular magnetic anisotropy.
Highlights
Remarkable progress has been made in the recent past in studying the physical properties of multiferroic heterostructures containing La1-xSrxMnO3 and BTO.[9,10,11,12,13,14] The prototypical ferroelectric BTO is the most studied perovskite-type ferroelectrics because of its desirable electrical and optical properties
We report a study of temperature dependent magnetic properties of epitaxial BTO/LSMO/BTO heterostructures using magneto-optical Kerr effect (MOKE) technique
The MOKE hysteresis loops are nearly square with low saturation fields
Summary
In the ferroelectric state below the Curie temperature T C of ∼110 ◦C, a spontaneous polarization arises due to the noncentrosymmetric displacement of Ti+4 and O 2 ions with respect to Ba+2 ions (P4mm). La1-xSrxMnO3 (LSMO) is a ferromagnetic metal for 0.17 < x < 0.6 with T C values mostly above the room temperature.[15] Epitaxial heterostructures of the two materials may provide the necessary interactions and constraints to significantly enhance. Epitaxial trilayers have long been used to alter the magnetic phase diagrams of magnetic thin films via the epitaxial clamping and strain effects, especially in materials with large magento elastic effects like the heavy rare earths.[16,17] In this paper, we report a study of temperature dependent magnetic properties of epitaxial BTO/LSMO/BTO heterostructures using magneto-optical Kerr effect (MOKE) technique
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