Two-dimensional magnetic interplay in the tensile-strained LaCoO3 thin films
Hao Liu1, Jiyu Fan, Fengjiao Qian
1Department of Applied Physics, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China. jiyufan@nuaa.edu.cn yanghao@nuaa.edu.cn.
Physical Chemistry Chemical Physics : PCCP
|February 23, 2021
Summary
Epitaxial Lanthanum cobaltate (LaCoO3) thin films exhibit a ferromagnetic-paramagnetic transition around 80 K. Critical behavior analysis reveals two-dimensional magnetic interactions, offering insights into the origin of ferromagnetism.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Thin Film Deposition
Background:
- Epitaxial Lanthanum cobaltate (LaCoO3) thin films are technologically relevant materials.
- Understanding their magnetic properties, particularly the ferromagnetic-paramagnetic (FM-PM) transition, is crucial for device applications.
Purpose of the Study:
- To investigate the nature of the magnetic phase transition in high-quality epitaxial LaCoO3 thin films.
- To determine the critical exponents and understand the underlying magnetic interactions.
Main Methods:
- Pulsed Laser Deposition (PLD) for thin film fabrication on SrTiO3 (STO) substrates.
- Modified Arrott plot and critical isotherm analysis to determine critical exponents (β and γ).
- Widom scaling relation and scaling hypothesis to validate critical exponent reliability.
Main Results:
- LaCoO3 films exhibit a typical FM-PM phase transition at approximately 80 K.
- Determined critical exponents: β = 0.754(1) with TC = 79.8(8) K and γ = 1.52(2) with TC = 79.9(2) K.
- Revealed two-dimensional (2D) long-range magnetic interaction with exchange distance J(r) ∼r-(3.46).
Conclusions:
- The critical behavior analysis provides a deeper understanding of the ferromagnetic origin in LaCoO3 thin films.
- The study confirms the reliability of the determined critical exponents and scaling relations.
- Findings contribute to understanding the fixed Curie temperature (TC) in these films.
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