Unit:
Κατεύθυνση Φυσική των ΥλικώνLibrary of the School of Science
Supervisors info:
Δρ. Αθανάσιος Δημουλάς, ΕΚΕΦΕ Δημόκριτος (Επιβλέπων)
Βλάσιος Λυκοδήμος, Αναπληρωτής Καθηγητής, Τμήμα Φυσικής ΕΚΠΑ
Φοίβος Μαυρόπουλος, Καθηγητής, Τμήμα Φυσικής ΕΚΠΑ
Original Title:
Μελέτη δισδιάστατων σιδηρομαγνητικών υλικών τύπου van der Waals που παρασκευάζονται με τη μέθοδο επιταξίας με μοριακές δέσμες
Translated title:
Study of two-dimensional ferromagnetic van der Walls materials grown by molecular beam epitaxy
Summary:
Extensive studies and scientific research is carried out on two-dimensional (2D) materials due to the unique electric, chemical, optical and mechanical properties they exhibit at the atomic scale. Lately, great effort is given in the research of magnetic 2D materials that compose van der Waals heterostructures. In this thesis, an experimental study is conducted studying the growth and characterization of CrxTey, that is considered to be an innovative stoichiometric compound. More specifically, the aim is growing samples of CrTe2 by molecular beam epitaxy (MBE) and characterizing them with RHEED, STM, XPS and ARPES methods. The main purpose of this study is to determine the stoichiometry of the samples and correlate final results with the growth conditions (substrate, growth temperature, etc.) and the number of atomic layers that are grown in each sample. Additionally, magnetic measurements, that were conducted in our samples using a SQUID magnetometer in a collaborate lab, are presented. Furthermore, the existence of ferromagnetic state is studied at temperatures between room temperature (300K) and low temperature (10K). Finally, the easy-axis of magnetization and other characteristics such as the hysteresis loop of our samples are determined.
Main subject category:
Science
Keywords:
Two-dimensional materials, van der Waals heterostructurs, molecular beam epitaxy, magnetism, Cr_xTe_y, CrTe_2
