Magnetne lastnosti sistemov maghemitnih nanodelcev

diplomski seminar na bolonjskem študijskem programu 1. stopnje Fizika

Filip Gregor (Author), Marko Jagodič (Mentor)

Abstract

V seminarju obravnavamo magnetne lastnosti sistemov maghemitnih nanodelcev. Meritve magnetne susceptibilnost, AC meritve in meritve magnetizacijske krivulje smo opravili na vzorcih z različnimi masnimi deleži maghemitnih nanodelcev, dispergiranih v vosku. Za analizo meritev smo uporabili Néelov model, ki velja za sisteme brez dipolnih interakcij med nanodelci, in Vogel-Fulcherjev model, ki velja za sisteme s šibkimi dipolnimi interakcijami. Iz analize meritev smo določili efektivno anizotropijsko konstanto in saturacijsko magnetizacijo nanodelcev, ter ocenili moč dipolne interakcije med njimi.

Keywords

magnetizem;superparamagnetizem;nanodelci;fizika;diplomski seminarji;

Data

Language:	Slovenian
Year of publishing:	2012
Typology:	2.11 - Undergraduate Thesis
Organization:	UM FNM - Faculty of Natural Sciences and Mathematics
Publisher:	[F. Gregor]
UDC:	53(043.2)
COBISS:	19466504
Views:	443
Downloads:	20
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Magnetic properties of maghemite nanoparticle systems
Secondary abstract:	In this work we study the magnetic properties of maghemite nanoparticles. Measurements of magnetic susceptibility, AC measurements and magnetization measurements were performed on samples with different weight percentages of nanoparticles dispersed in wax. For the analysis of the sample without dipolar interactions we used Néel's model. In the case of samples with small dipole interactions we applied the Vogel-Fulcker model. From the analysis we were able to obtain the effective anisotropy constant and the saturation magnetization of nanoparticles. Furthermore, we estimated the strength of dipole interactions between nanoparticles.
Secondary keywords:	maghemite nanoparticles;Néel model;Vogel - Fulcher model;dipole interactions;magnetic susceptibility measurements;AC magnetic measurements;magnetization measurements;
Type (COBISS):	Final seminar paper
Thesis comment:	Univ. v Mariboru, Fak. za naravoslovje in matematiko, Oddelek za fiziko
Pages:	17 f.
ID:	12528402