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Title:Spinska stekla
Authors:ID Ornik, Jan (Author)
ID Jagodič, Marko (Mentor) More about this mentor... New window
Files:.pdf UNI_Ornik_Jan_2013.pdf (1,05 MB)
MD5: 69BF5B32D90062416F614033F0F7C916
 
Language:Slovenian
Work type:Final seminar paper
Typology:2.11 - Undergraduate Thesis
Organization:FNM - Faculty of Natural Sciences and Mathematics
Abstract:V diplomskem seminarju obravnavamo magnetne lastnosti kanoničnega spinskega stekla Cu94Mn6. Iz meritev temperaturne odvisnosti susceptibilnosti v konstantnem majhnem magnetnem polju določimo temperaturo zamrznitve. Meritvam nad temperaturo zamrznitve prilagodimo Curie-Weissov zakon in izračunamo efektivni magnetni moment. Izmerimo tudi magnetizacijo vzorca v magnetnem polju do 5 T in opazimo histerezno obnašanje. Iz meritev susceptibilnosti v izmeničnem magnetnem polju izračunamo faktor spremembe temperature zamrznitve s spremembo frekvence izmeničnega polja, ki jih opišemo tudi z empiričnim Vogel-Fulcherjevim modelom.
Keywords:kanonična spinska stekla, susceptibilnost, magnetizacija, temperatura zamrznitve, Curie-Weissov zakon, efektivni magnetni moment, interakcije med magnetnimi momenti, Vogel-Fulcherjev zakon
Place of publishing:Maribor
Publisher:[J. Ornik]
Year of publishing:2013
PID:20.500.12556/DKUM-42499 New window
UDC:53(043.2)
COBISS.SI-ID:20306184 New window
NUK URN:URN:SI:UM:DK:I6KLCAN8
Publication date in DKUM:30.01.2014
Views:2068
Downloads:129
Metadata:XML DC-XML DC-RDF
Categories:FNM
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Secondary language

Language:English
Title:Spin glasses
Abstract:In this seminar we analyse magnetic properties of the canonical spin glass Cu94Mn6. We determine the freezing temperature from susceptibility measurements at low constant magnetic field. We use the Curie-Weiss law to describe susceptibility dependence on temperature at temperatures above the freezing temperature and calculate the effective magnetic moment. We measure magnetization of the sample in magnetic fields up to 5 T and find hysteresis behaviour. From the measurement of the susceptibility in alternating magnetic field we determine coefficient between the change in the freezing temperature and change in frequency of the applied magnetic field. We describe these changes using the empiric Vogel-Fulcher model.
Keywords:canonical spin glass, susceptibility, magnetization, freezing temperature, Curie-Weiss law, effective magnetic moment, magnetic moment interactions, Vogel-Fulcher model


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