Bachelor's Thesis
Effect of ion beam irradiation and annealing on magnetic properties of FeRh nanostructures
Final Thesis 8.15 MBAuthor of thesis: Ing. Oleksii Zadorozhnii
Acad. year: 2018/2019
Supervisor: Dr. Ing. Michal Staňo
Reviewer: Ing. Igor Turčan, Ph.D.
Abstract:The first order phase transition from antiferromagnetic to ferromagnetic state in Fe50Rh50 at 370 K make it a suitable material for next generation spin electronic devices with a low power consumption.
This work deals with the ways how the phase transition temperature of iron-rhodium (FeRh) can be tuned locally in thin films, using focused ion beam (FIB) and thermal annealing. FIB irradiation approach was chosen due to the fact that FeRh displays magnetic sensitivity to the degree of its chemical ordering, which is characteristic to all alloys of ferromagnetic and non-ferromagnetic metals. Thermal annealing enables the relaxation of the structure and restoration of its crystallinity. The magnetic patterns were manufactured using gallium-based FIB and annealed under ultra high vacuum. The topography as well as magnetic behaviour of these ion irradiated patterns were investigated using atomic and magnetic force microscopies at different temperatures, showing a clear dependence between ion irradiation dose and the magnetic response in pre- and post-annealed states.
FeRh, iron-rhodium alloy, thin film, ion irradiation, annealing, focused ion beam, magnetic force microscopy, phase transition
Date of defence
21.06.2019
Result of the defence
Defended (thesis was successfully defended)
Grading
C
Process of defence
Po otázkách oponenta bylo dále diskutováno: Vliv iontů galia na měření.
Language of thesis
English
Faculty
Department
Study programme
Engineering (B3S-P)
Field of study
Fundamentals of Mechanical Engineering (B-STI)
Composition of Committee
prof. RNDr. Tomáš Šikola, CSc. (předseda)
prof. RNDr. Miroslav Liška, DrSc. (místopředseda)
prof. RNDr. Petr Dub, CSc. (člen)
prof. RNDr. Jiří Spousta, Ph.D. (člen)
doc. Ing. Radek Kalousek, Ph.D. (člen)
prof. RNDr. Radim Chmelík, Ph.D. (člen)
doc. Ing. Stanislav Průša, Ph.D. (člen)
prof. RNDr. Pavel Zemánek, Ph.D. (člen)
Supervisor’s report
Dr. Ing. Michal Staňo
Grade proposed by supervisor: D
Reviewer’s report
Ing. Igor Turčan, Ph.D.
Grade proposed by reviewer: D