Effect of nonstoichiometry on the magnetism and ferroelectricity of Fe- and Co-substituted strontium titanate thin films

Multiferroic and magnetoelectric materials, in which the magnetic properties can be controlled via electric field and vice versa, hold the potential to be useful in several emerging memory technologies, including spin-wave devices and multi-state memory. Room temperature ferromagnetism and ferroelectricity are of great interest to the multiferroic and magnetoelectric community, as a key challenge in the field is engineering a material exhibiting room temperature ferroelectricity and ferromagnetism. Pulsed laser deposition grown oxygen-deficient Fe- (STF) and Co- (STC) substituted strontium titanate thin films are investigated for their microstructural, magnetic and ferroelectric properties. The films demonstrate room temperature ferromagnetism when grown under highly reducing conditions and in the case of STF, appear to exhibit room temperature ferroelectricity, though the magnetoelectric coupling is quite small. The impact of double-epitaxy on magnetism is investigated in STC.

Name thesis:degree_name

Doctoral

Department dc:contributor.department

Massachusetts Institute of Technology. Department of Materials Science and Engineering

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2019

Author dc:creator

• Tang, Astera S.

Advisor dc:contributor.advisor

• Caroline A. Ross.

• Materials Science and Engineering.

Statement dc:rights

• MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

https://hdl.handle.net/1721.1/121832

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/121832