Bachelor's Thesis
Magnetic properties of materials based on metastable Fe-Ni thin films
Final Thesis 8.57 MBAuthor of thesis: Ing. Viola Křižáková
Acad. year: 2015/2016
Supervisor: Ing. Lukáš Flajšman, Ph.D.
Reviewer: Ing. Vojtěch Uhlíř, Ph.D.
Abstract:Metastable Fe78Ni22 thin films grown on Cu(100) substrates are known for their capability of structural and magnetic phase transition upon ion beam irradiation. This thesis focuses on characterization of magnetic properties of FeNi layers with the emphasis on their anisotropic behaviour. An analytical model describing magnetic anisotropies, in planar structures and thin films, and its modification for Fe78Ni22/Cu(100) system is described in the theoretical part. In the experimental part, the anisotropy of ion-beam-transformed FeNi structures is thoroughly studied. The transformed films and patterns exhibit four-fold magnetic anisotropy originating from bcc iron crystal structure. Further, the possibility of modification of the magnetic anisotropy type by selecting a proper focused ion beam scanning strategy during the transformation is demonstrated. In the last part of the thesis, the maximum achievable lateral resolution of focused ion beam transformed structures is explored and a prototypical magnonic crystal is prepared.
metastable FeNi thin films, magnetic anisotropy, focused ion beam, magnetic hysteresis, Stoner-Wohlfarth model
Date of defence
22.06.2016
Result of the defence
Defended (thesis was successfully defended)
Grading
A
Language of thesis
Czech
Faculty
Department
Study programme
Applied Sciences in Engineering (B3901-3)
Field of study
Physical Engineering and Nanotechnology (B-FIN)
Composition of Committee
prof. RNDr. Tomáš Šikola, CSc. (předseda)
prof. RNDr. Miroslav Liška, DrSc. (místopředseda)
prof. RNDr. Bohumila Lencová, CSc. (člen)
prof. RNDr. Petr Dub, CSc. (člen)
prof. RNDr. Radim Chmelík, Ph.D. (člen)
prof. RNDr. Jiří Spousta, Ph.D. (člen)
prof. Ing. Ivan Křupka, Ph.D. (člen)
prof. RNDr. Pavel Zemánek, Ph.D. (člen)
RNDr. Antonín Fejfar, CSc. (člen)
doc. Ing. Radek Kalousek, Ph.D. (člen)
Supervisor’s report
Ing. Lukáš Flajšman, Ph.D.
Grade proposed by supervisor: A
Reviewer’s report
Ing. Vojtěch Uhlíř, Ph.D.
Grade proposed by reviewer: A