Properties of off stoichiometric yttrium iron garnet

YFO (YFeO3) target is used for deposition on GGG (Ga3Gd5O12) substrates with different directions: (001), (110) and (111) by PLD (Pulsed Laser Deposition). HRXRD characterization shows that high-quality epitaxial garnet phase is formed on GGG substrates. However, RSM results show that the off-stoichiometric YIG film on (111) GGG substrates can remain fully strained in plane with thickness from 23 nm to 74 nm; while the samples on (001) GGG substrates show different degrees of relaxation in-plane depending on film thickness. Magnetic characterization shows that the samples grown on (111) GGG substrates have saturation magnetization Ms~45 emu/cc, which is significantly smaller than standard YIG (~140 Ms~45/emu/cc). Furthermore, the Curie temperature of samples grown on (111) GGG is ~ 310K, in obvious contrast with standard YIG ~560K.

Name thesis:degree_name

Master

Department dc:contributor.department

Massachusetts Institute of Technology. Department of Mechanical Engineering

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2020

Author dc:creator

• Su, Tingyu(Mechanical engineer)Massachusetts Institute of Technology.

Advisor dc:contributor.advisor

• .

• Mechanical Engineering.

Statement dc:rights

• MIT theses may be protected by copyright. Please reuse MIT thesis content according to the MIT Libraries Permissions Policy, which is available through the URL provided.

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/1721.1/127115

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/127115