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Study program: Physics of condensed matter



Theme: Relaxation phenomena in low-dimensional and molecular magnets


Supervisor: Assoc. Prof. RNDr. Erik Čižmár, PhD.

Form of study: daily

Annotation: Thesis is devoted to the experimental study of selected low-dimensional and molecular magnets with aim to study slow magnetic relaxation related to the spin-lattice relaxation processes. Spin-lattice relaxation rate represents the upper limit for spin-spin relaxation, which is a characteristic parameter (quantum coherence time) related to the application of a molecular magnet as a quantum bit. Low-dimensional magnets also represent a natural playground for the study of quantum entanglement. Analysis of EPR spectra, magnetic and thermodynamic properties at low-temperatures will be performed for determination of characteristic parameters of magnetic system and their relation to possible quantum computing applications. Studied low-dimensional magnets will be based on 3d ions.

Theme: Magnetization processes of soft magnetic composites


Supervisor: Assoc. Prof. RNDr. Ján Füzer, PhD.

Form of study: daily

Annotation: The study is oriented on investigation of the NiFe and FeSi based composite materials with inorganic or organic nonconductive binder. Part of the work is the investigation of temperature dependences of the wideband complex permeability and energy losses in prepared soft magnetic composites and determination the influence of operating temperature on magnetization processes. The aim is optimization of preparation process of soft magnetic materials with required magnetic properties at middle-frequency ac magnetic fields and in temperature interval from -50ºC to 200ºC.

Theme: Interplay of the spin and lattice dimensionality in the quantum processes in the selected quantum magnets with extremely high measure of spatial anisotropy of exchange coupling


Supervisor: Assoc. Prof. RNDr. Alžbeta Orendáčová, DrSc.

Consultant: RNDr. Vladimír Tkáč, PhD.

Form of study: daily

Annotation: The work has experimental character focused on the understanding of microscopic origin of mechanisms responsible for the change of lattice dimensionality (phase transitions) and spin dimensionality (type of anisotropy -dipolar, exchange, crystal field,etc). Using selected compounds, various experiments will be performed including measuring of thermodynamic quantities, electron paramagnetic resonance and infrared spectroscopy. If need arises, also other quantities as heat transport, neutron diffraction and ac susceptibility will be measured. Analysis of exp. data will enable to define the character of magnetic system. When we find a proper system with high measure of spatial anisotropy of exchange coupling, the compound will serve as a toy-model system for the study of quantum processes in the dimension 0, 1 or 2. Besides standard managing of exp. methods available in our laboratories, the student is expected to learn at least one of standard program packages which enable simple DFT calculations or others like EasySpin, Fullproff , ALPS atc. With respect to actual conditions in our society, acquirement of softwer literacy is crucial for future potential job of PHD student.

Theme: Magnetization processes in quantum and nanoscopic systems


Supervisor: Prof. Ing. M. Orendáč, CSc.

Consultant: RNDr. Róbert Tarasenko, PhD.

Form of study: daily

Annotation: The thesis will be focused on experimental study of static and dynamic magnetic properties of selected quantum and nanoscopic systems. Systematic study of the influence of the size of Au, Pt, Pd nanoparticles as well as thiol – based surfactants on magnetic properties of the nanoparticles will be performed, the nanoparticles will be deposited on various substrates. Specifically arranged Fe2O3 nanoparticles will be adopted for the investigation of forming reentrant superspin glass state. Static properties and relaxation phenomena in systems with random anisotropy will be studied, the systems will be obtained by doping of 3d and 4f ions into phosphate glass Zn2(PO3)5.

Theme: Spatial distribution of superconducting order parameter in unconventional superconductors


Supervisor: Mgr. Tomáš Samuely, PhD.

Consultant: Prof. RNDr. Peter Samuely, DrSc.

Form of study: daily

Annotation: Scanning tunneling microscopy (STM) is the perfect tool for the investigation of superconducting materials, since it is extremely sensitive to the slightest differences in the local density of states. In tandem with the scanning Hall-probe microscopy, the two main aspects of superconductivity, namely magnetic and electronic properties, can be examined with superior spatial resolution. In our laboratories both scanning probe microscopies are at hand. Naturally, both techniques are operational at ultra-low temperatures and in high magnetic fields, which is an essential requirement for studying superconductivity. What is more, in addition to sample materials provided by our collaborators, which will be examined during the thesis, in-situ preparation of superconductors will be a pivotal subject. This will be carried out in our state of the art ultra-high vacuum system featuring a complete set of experimental techniques for in-situ sample preparation, surface characterization and STM studies.



Theme: Influence of anisotropy on the domain wall shape and domain wall dynamics


Supervisor: Prof. RNDr. Rastislav Varga, DrSc.

Consultant: RNDr. Kornel Richter, PhD.

Form of study: daily

Annotation: The aim of the work is to study the influence of anisotropy on the shape of domain wall in static and dynamic regime. To find the parameters influencing the shape and to suggest experiment to control the domain wall shape and dynamics by properly selected anisotropy.

Theme: The study of dynamic magnetic properties and relaxation process in magnetic nanoparticles


Supervisor: Assoc. Prof. RNDr. Adriana Zeleňáková, PhD.

Form of study: daily

Annotation: Mono-domain magnetic nanoparticles based on Fe, Co, and Gd have recently been the subject of great interest due to their intrinsic physical properties, associated with quantum size effect, as well as applications in electronics and biomedicine. The spin structure of nanoparticles can be affected by inter-particle interactions. One of the powerful ways how to get a better insight into the nature of inter-particle interactions and estimate their strong is the analysis of ac magnetic susceptibility.
The PhD. study is oriented on investigation of dynamic magnetic properties and analyses of relaxation processes. The aim is to study the possibility of change in relaxation processes by controlling the inter-particle interactions, energy barrier distribution, particles size, in the term of magnetic hyperthermia applications.



Actions


2017-05-18


Otvorenie Relaxačného kútika Mark pre študentov


2017-05-11


Selected topics in magnetism



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Institutions


Pavol Jozef Šafárik University in Košice
Faculty of Science UPJŠ

Departments


Department of Biophysics
Department of Condensed Matter Physics
Department of Nuclear Physics and Subnuclear Physics
Department of Theoretical Physics and Astrophysics
Division of Didactics of Physics

Projects


Establish
Modernisation of education
Science on Stage
SCIENCENET
Do not worry physics
Students and teachers at CERN
Discover beauty of physics
Creative physics teacher

Projects


SeeVogh systém
Moodle
Celim

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