Title :
Magnetoresonance Research of Cox(Al2O3)1-x Nanogranular Films in the Vicinity of Magnetic Phase Transition
Author :
Bagmur, T.V. ; Kravets, A.F. ; Nedukh, S.V. ; Pogoreliy, A.N. ; Tarapov, S.I.
Author_Institution :
IRENASU, Kharkov
Abstract :
The ESR response of 35-40 GHz band from nanostructure Cox(Al2O3)1-x was analyzed. The linewidth increases while the Co concentration decreases. The magnetization of saturation drops to zero when Co concentration decreases up to concentration of Co falls up to metal-dielectric threshold. The magnetic phase transition from ferromagnetic to superparamagnetic state has been detected in the vicinity of the metal-dielectric transition.
Keywords :
alumina; cobalt compounds; ferromagnetic materials; ferromagnetic-paramagnetic transitions; granular materials; impurity distribution; magnetic thin films; magnetisation; metal-insulator transition; nanostructured materials; paramagnetic materials; paramagnetic resonance; superparamagnetism; Co concentration; Cox(Al2O3)1-x; ESR; ferromagnetic state; frequency 35 GHz to 40 GHz; magnetic phase transition; magnetization; magnetoresonance; metal-dielectric transition; nanogranular films; superparamagnetic state; Application software; Frequency; Giant magnetoresistance; Magnetic field measurement; Magnetic films; Magnetization; Nanostructures; Paramagnetic resonance; Quantum computing; Temperature;
Conference_Titel :
Physics and Engineering of Microwaves, Millimeter and Submillimeter Waves and Workshop on Terahertz Technologies, 2007. MSMW '07. The Sixth International Kharkov Symposium on
Conference_Location :
Kharkov
Print_ISBN :
1-4244-1237-4
DOI :
10.1109/MSMW.2007.4294814
