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Influence of substrate-induced strain on exchange bias effect in YSMO/LSMO heterostructures

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Abstract

Magnetic properties of Y0.67Sr0.33MnO3 (YSMO) and La0.67Sr0.33MnO3 (LSMO) thin films heterostructures (YSMO/LSMO) deposited on single-crystalline (001) SrTiO3 (STO), (001) LaAlO3 (LAO) and MgO substrates using pulsed laser deposition technique were investigated. Magnetization (M) vs. the applied field (H) measurements revealed shift in hysteresis loop showing the exchange bias effect of about 80 Oe for the heterostructures on LAO substrate, which was absent for those on STO substrates. In order to investigate this, single-layer LSMO layers were deposited on these substrates. X-ray diffraction patterns revealed significant compressive strain and a weaker tensile strain for LSMO films on LAO and STO substrates, respectively. Raman spectroscopy measurements further confirmed the lattice mismatch-induced strain in LSMO layer on LAO substrate. These different strain conditions in LSMO films on both the substrates are suggested to be contributing to the emergence of different magnetic ground states in these systems, which could be leading to pinning of spins at the interface and resulting in a significant exchange bias effect (EBE) on LAO substrate.

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Acknowledgements

We would like to thank Dr P Veerender, Technical Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India, for carrying out ellipsometry measurements on LSMO thin films.

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Correspondence to N Padma.

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Waman, P.T., Bhatt, H., Rao, R. et al. Influence of substrate-induced strain on exchange bias effect in YSMO/LSMO heterostructures. Bull Mater Sci 46, 116 (2023). https://doi.org/10.1007/s12034-023-02951-1

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