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Optical setup for torque detected electron spin resonance spectroscopy
Kern, Michal ; Vetushka, Aliaksei (oponent) ; Neugebauer, Petr (vedoucí práce)
This thesis has been devoted to the improvement of a Torque Detected Electron Spin Resonance (TDESR) spectrometer by replacing the current capacitive detection of cantilever bending with optical methods. The thesis covers the basics of Electron Spin Resonance (ESR) spectrometry with the focus on TDESR and the field of single molecule magnetism. Laser beam deflection and interferometric detection methods are explained. The design of the TDESR spectrometer and its performance is shown on successfully obtained high quality TDESR spectra of an Fe4 single molecule magnet single crystal. Obtained results prove the feasibility of implemented detection method and its superiority with respect to the previously used capacitive method in terms of quality, resolution and speed. To further improve the TDESR setup, we have designed and assembled a system which uses an interferometer for detection of cantilever bending.
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Design of single-crystal sample holder for high-frequency electron paramagnetic resonance
Gabriš, Andrej ; Kern, Michal (oponent) ; Sojka, Antonín (vedoucí práce)
This bachelor's thesis discusses the design and manufacture of non-resonant sample holder for the study of oriented crystals, which is used for high-frequency electron paramagnetic resonance (HF-EPR). The first part of the thesis is a theoretical introduction to EPR with the application of high frequency (80-1100 GHz) and high magnetic field (16 T). This work further analyzes the topic of crystal samples anisotropy and introduces the review of materials suitable for a sample holder, which is used in low-temperature conditions (4 K). The practical part of the thesis deals with the constructional design of the rotary sample holder. This section also compares the manufacturing possiblities of the selected parts of the sample holder: machining (milling and turning) and 3D printing. Lastly, this work describes the development of the user interface for automatization of an EPR spectrum measurement.
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Optimalizace vysokofrekvenčního atomárního disociačního zdroje pro depozici GaN
Kern, Michal ; Wertheimer, Pavel (oponent) ; Mach, Jindřich (vedoucí práce)
Táto bakalárska práca sa zaoberá sprevádzkovaním a optimalizáciou vysokofrekvenčného atomárneho disociačného zdroja dusíka pre depozíciu GaN. Teoretická časť sa zaoberá atomárnymi zdrojmi, rastom ultratenkých vrstiev a problematikou vysokofrekvenčných obvodov, s dôrazom na ich návrh pomocou Smithových diagramov. Taktiež pojednáva o metódach prípravy GaN ultratenkých vrstiev a nanostĺpcov. V experimentálnej časti je popísaný návrh a samotná realizácia rôznych kongurácii vyrovnávacej jednotky impedancie pre atomárny zdroj dusíku. Pomocou tejto vyrovnávacej jednotky bolo dosiahnuté zapálenie dusíkovej plazmy a bolo analyzované jej spektrum. Následne je popísaný návrh a realizácia ovládania vyrovnávacej jednotky pomocou krokových motorov.
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Design of single-crystal sample holder for high-frequency electron paramagnetic resonance
Gabriš, Andrej ; Kern, Michal (oponent) ; Sojka, Antonín (vedoucí práce)
This bachelor's thesis discusses the design and manufacture of non-resonant sample holder for the study of oriented crystals, which is used for high-frequency electron paramagnetic resonance (HF-EPR). The first part of the thesis is a theoretical introduction to EPR with the application of high frequency (80-1100 GHz) and high magnetic field (16 T). This work further analyzes the topic of crystal samples anisotropy and introduces the review of materials suitable for a sample holder, which is used in low-temperature conditions (4 K). The practical part of the thesis deals with the constructional design of the rotary sample holder. This section also compares the manufacturing possiblities of the selected parts of the sample holder: machining (milling and turning) and 3D printing. Lastly, this work describes the development of the user interface for automatization of an EPR spectrum measurement.
|
|
|
Optical setup for torque detected electron spin resonance spectroscopy
Kern, Michal ; Vetushka, Aliaksei (oponent) ; Neugebauer, Petr (vedoucí práce)
This thesis has been devoted to the improvement of a Torque Detected Electron Spin Resonance (TDESR) spectrometer by replacing the current capacitive detection of cantilever bending with optical methods. The thesis covers the basics of Electron Spin Resonance (ESR) spectrometry with the focus on TDESR and the field of single molecule magnetism. Laser beam deflection and interferometric detection methods are explained. The design of the TDESR spectrometer and its performance is shown on successfully obtained high quality TDESR spectra of an Fe4 single molecule magnet single crystal. Obtained results prove the feasibility of implemented detection method and its superiority with respect to the previously used capacitive method in terms of quality, resolution and speed. To further improve the TDESR setup, we have designed and assembled a system which uses an interferometer for detection of cantilever bending.
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|
|
Optimalizace vysokofrekvenčního atomárního disociačního zdroje pro depozici GaN
Kern, Michal ; Wertheimer, Pavel (oponent) ; Mach, Jindřich (vedoucí práce)
Táto bakalárska práca sa zaoberá sprevádzkovaním a optimalizáciou vysokofrekvenčného atomárneho disociačného zdroja dusíka pre depozíciu GaN. Teoretická časť sa zaoberá atomárnymi zdrojmi, rastom ultratenkých vrstiev a problematikou vysokofrekvenčných obvodov, s dôrazom na ich návrh pomocou Smithových diagramov. Taktiež pojednáva o metódach prípravy GaN ultratenkých vrstiev a nanostĺpcov. V experimentálnej časti je popísaný návrh a samotná realizácia rôznych kongurácii vyrovnávacej jednotky impedancie pre atomárny zdroj dusíku. Pomocou tejto vyrovnávacej jednotky bolo dosiahnuté zapálenie dusíkovej plazmy a bolo analyzované jej spektrum. Následne je popísaný návrh a realizácia ovládania vyrovnávacej jednotky pomocou krokových motorov.
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