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Magnetic X-ray Spectroscopy Studies of PLD grown Magnetoelectric Hexaferrites

Beevers, J E (2018) Magnetic X-ray Spectroscopy Studies of PLD grown Magnetoelectric Hexaferrites. PhD thesis, University of York.

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Abstract

The work here in was undertaken with two main objectives. The first has been to design and develop a bespoke pulsed laser deposition growth system to enable the growth of high quality transition metal oxide thin films. The system has been constructed to allow for the growth of multi-block or layered systems, such as the R, S and T-blocks of hexaferrites, by utilising an alternating target approach. Ultimately, the growth system’s ability to grow complex oxide thin films has been tested and the successful growth of an epitaxial M-type hexaferrite, with material properties that compare well to the literature, has been realised. Additionally, the magnetoelectric effect in M-type Ti-Co doped strontium hexaferrite, SrCo2Ti2Fe8O19, has been studied using a combination of magnetometry and element specific soft x-ray spectroscopies. A large increase (>30x) in the magnetoelectric coefficient is found when Co2+ enters the trigonal bi-pyramidal site. The 5-fold trigonal bi-pyramidal site has been shown to provide an unusual mechanism for electric polarization based on the displacement of magnetic transition metal ions. For Co entering this site, an off-centre displacement of the cation may induce a large local electric dipole as well as providing an increased magnetostriction enhancing the magnetoelectric effect.

Item Type: Thesis (PhD)
Related URLs:
Academic Units: The University of York > Physics (York)
Identification Number/EthosID: uk.bl.ethos.759894
Depositing User: Mr J E Beevers
Date Deposited: 03 Dec 2018 16:35
Last Modified: 19 Feb 2020 13:07
URI: http://etheses.whiterose.ac.uk/id/eprint/21469

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