Chauhan, Shital and Kumari, Suman and Siwach, P. K. and Maurya, K. K. and Malik, Vivek and Singh, H. K. (2020) Magnetic phase profile in La0.7Ca0.3MnO3/Pr0.58Ca0.42MnO3 superlattices: Role of substrate inherent disorders. Journal of Magnetism and Magnetic Materials, 499. pp. 166284-166290. ISSN 0304-8853

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Abstract

We report the impact of dissimilar substrate inherent twinning over the structural, electrical and magnetic properties of otherwise identical ferromagnetic/antiferromagnetic La0.7Ca0.3MnO3/Pr0.58Ca0.42MnO3 (LCMO/PCMO) superlattices (SLs). 12 layers of LCMO and PCMO each similar to 11 nm thick were deposited and then LCMO was deposited as the top layer. The SLs were fabricated by RF magnetron sputtering method over three LaAlO3 (0 0 1) substrates embodied with different twinning disorders. Structural analysis employing high resolution X-ray diffraction (HRXRD; 2 theta, omega, and phi scans) demonstrates that substrate twin structures exactly get imprinted over all the superlattice peaks. Transport and magnetization measurements showed coupled insulator-metal (IM)/paramagnetic-ferromagnetic (PM-FM) transition around 220 K in all the three SLs. In the high temperature PM region all the samples behave similarly however at low temperatures where long-range ferromagnetic metal (FMM) and antiferromagnetic insulating (AFMI) phases start emerging in LCMO and PCMO respectively, SLs show deviant behaviors. This is ascribed to the substrate originated microstructural disorders in SLs which are distinct for all the samples and hence perturb FMM/AFMI interfacial interactions differently. Samples with prominently large substrate FWHM = 0.683 degrees and 0.959 degrees respectively show a second but weak IM transition and a strong hysteretic IM transition behavior. Magnetization displays a hysteretic behavior in field cooled data measured during cooling and warming cycles. The hysteresis gets stronger with the rise in FWHM which signifies an enhancement of phase competition between FMM and AFMI phases at the interfaces. This behavior of LCMO/PCMO SLs is attributed to the interfacial exchange interactions lead magnetic reconstruction at the interfaces.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier.
Subjects:	Multidisciplinary Materials Science Applied Physics/Condensed Matter
Divisions:	UNSPECIFIED
Depositing User:	Mr. Yogesh Joshi
Date Deposited:	25 Mar 2022 10:41
Last Modified:	25 Mar 2022 10:41
URI:	http://npl.csircentral.net/id/eprint/4798

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