Issue 8, 2021

Two-dimensional magnetic interplay in the tensile-strained LaCoO3 thin films

Abstract

High-quality epitaxial LaCoO3 (LCO) thin films have been deposited on SrTiO3 (STO) substrates with pulsed laser deposition (PLD). We find that the LCO films undergo a typical ferromagnetic–paramagnetic (FM–PM) phase transition at ∼80 K. To understand the nature of magnetic phase transition, various methods, including the modified Arrott plot and critical isotherm analysis, were used to determine the critical exponents, which are β = 0.754(1) with a Curie temperature TC = 79.8(8) K and γ = 1.52(2) with TC = 79.9(2) K. The reliability of these critical exponents was confirmed using the Widom scaling relation and the scaling hypothesis. Further analysis revealed that the spin coupling within the LCO films exhibits two-dimensional (2D) long-range magnetic interaction and the magnetic exchange distance decays as J(r) ∼ r−(3.46). Our critical behavior analysis may shed new light on the further understanding of the origin of FM and the relatively fixed TC in LCO thin films.

Graphical abstract: Two-dimensional magnetic interplay in the tensile-strained LaCoO3 thin films

Article information

Article type
Paper
Submitted
23 Oct 2020
Accepted
18 Jan 2021
First published
19 Jan 2021

Phys. Chem. Chem. Phys., 2021,23, 4912-4918

Two-dimensional magnetic interplay in the tensile-strained LaCoO3 thin films

H. Liu, J. Fan, F. Qian, Y. Ji, A. Rahman, R. Tang, L. Zhang, L. Ling, Y. Zhu and H. Yang, Phys. Chem. Chem. Phys., 2021, 23, 4912 DOI: 10.1039/D0CP05550F

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