20.500.12556/DKUM-38604 Magnetne lastnosti sistemov maghemitnih nanodelcev Magnetic properties of maghemite nanoparticle systems 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 jakost dipolne interakcije med njimi. 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. maghemitni nanodelci Néelov model Vogel - Fulcherjev model dipolne interakcije meritve magnetne susceptibilnosti AC magnetne meritve meritve magnetizacijske krivulje maghemite nanoparticles Néel model Vogel - Fulcher model dipole interactions magnetic susceptibility measurements AC magnetic measurements magnetization measurements true true false [F. Gregor] Slovenski jezik Angleški jezik Delo diplomskega seminarja/zaključno seminarsko delo/naloga 2012-10-04 16:57:24 2021-02-03 16:29:05 2022-05-04 13:26:42 2021-04-20 03:19:25 2012 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 53(043.2) 19466504 URN:SI:UM:DK:M1TQQ5ZZ UNI_Gregor_Filip_2012.pdf UNI_Gregor_Filip_2012.pdf 1 1E88DD0D588BBBD89A0F5435A427A206 b5cd34f649b3ed17db1cbea8749cdaf200351c95566b41cfcad96e9b6fe68031 85273a45-7c08-11eb-bb7a-00155d0001ca 20.500.12556/dkum/ec3cf7e2-ee2b-4d23-a3e7-cea47199ab1c https://dk.um.si/Dokument.php?lang=slv&id=51741 Fakulteta za naravoslovje in matematiko 0 0 0