Growth and Properties of BiMnO3 Thin Films
File(s)
Author(s)
Yeh, Kuan-Cheng
Type
Thesis
Abstract
BiMnO3 thin films were epitaxially grown on SrTiO3 (100) substrates using pulsed laser deposition (PLD). The growth of thin films was extremely sensitive to substrate deposition temperatures, and single-phase BiMnO3 only could be formed in a narrow temperature window of around 640°C in an oxygen pressure of 75mTorr. It was found that the post annealing at 550°C in an oxygen pressure of 7.6×105 mTorr effectively improved the crystallinity of the film. The BiMnO3 films were found to be strongly (-202) oriented. The out-of-plane orientation relationship was (-202) BiMnO3 || (100) SrTiO3. From the result of phi (φ) scan, the (-202) plane showed a four-fold rotational symmetry, and the existence of a 45°rotation between the SrTiO3 (100) plane and the BiMnO3 (-202) plane. Magnetic measurements revealed that the BiMnO3 thin film was ferromagnetic with a Curie temperature (Tc) of about 80K, lower than that of the bulk material.
Version
Open Access
Date Issued
2013-10
Date Awarded
2013-12
Copyright Statement
Attribution NoDerivatives 4.0 International Licence (CC BY-ND)
Advisor
McLachlan, Martyn A
Petrov, Peter K
Publisher Department
Materials
Publisher Institution
Imperial College London
Qualification Level
Masters
Qualification Name
Master of Philosophy (MPhil)