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

Volume

2

fYear

2007

fDate

25-30 June 2007

Firstpage

785

Lastpage

787

Abstract

The ESR response of 35-40 GHz band from nanostructure Co_x(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; Co_x(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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/MSMW.2007.4294814

Filename

4294814