Defect engineering of magnetic ground state in EuTiO epitaxial thin films
arXiv:2107.07711 · doi:10.1111/jace.17870
Abstract
Atomistic defect engineering through the pulsed laser epitaxy of perovskite transition metal oxides offers facile control of their emergent opto-electromagnetic and energy properties. Among the various perovskite oxides, EuTiO3 exhibits a strong coupling between the lattice, electronic, and magnetic degrees of freedom. This coupling is highly susceptible to atomistic defects. In this study, we investigated the magnetic phase of EuTiO epitaxial thin films via systematic defect engineering. A magnetic phase transition from an antiferromagnet to a ferromagnet was observed when the unit cell volume of EuTiO3 expanded due to the introduction of Eu-O vacancies. Optical spectroscopy and density functional theory calculations show that the change in the electronic structure as the ferromagnetic phase emerges can be attributed to the weakened Eu-Ti-Eu super-exchange interaction and the developed ferromagnetic Eu-O-Eu interaction. Facile defect engineering in EuTiO thin films facilitates understanding and tailoring of their magnetic ground state.
References in corpus (9)
- Magnetic and electric phase control in epitaxial EuTiO from first principles
- Topotactic phase transformation of the brownmillerite SrCoO2.5 to the perovskite SrCoO3-δ
- Analogies of structural instabilities in EuTiO3 and SrTiO3
- Enhanced electrocatalytic activity via phase transitions in strongly correlated SrRuO3 thin films
- Reversal of the lattice structure in SrCoOx epitaxial thin films studied by real-time optical spectroscopy and first-principles calculations
- Reversible Control of Magnetic Interactions by Electric Field in a Single Phase Material
- Phase transitions via selective elemental vacancy engineering in complex oxide thin films
- Tuning electromagnetic properties of SrRuO3 epitaxial thin films via atomic control of cation vacancies
- Ferroelectricity and ferromagnetism in EuTiO3 nanowires