Title :
Influence of oxygen and nitrogen on impedance and magnetoimpedance of soft magnetic CoFeZr nanoparticles embedded in alumina matrix
Author :
Fedotova, Julia ; Saad, Anis ; Larkin, Andrey ; Fedotova, Vera ; Ilyashuk, Yury ; Fedotov, Alexander ; Kalinin, Yury ; Sitnikov, Alexander
Author_Institution :
Dept. of Energy Phys., Belarusian State Univrsity, Minsk, Belarus
Abstract :
It was revealed that the magnetic state and impedance of the (Co45Fe45Zr10)x(Al2O3)100-x films strongly depend on a gas atmosphere of sputtering. At the deposition of the films in the presence of oxygen or nitrogen gases, the region of the superparamagnetic state was expanded far beyond the percolation threshold xC determined for the films deposited in pure Ar gas. An inductive contribution in equivalent circuits of the studied nanocomposites is evidence that the current-conducting routes within the film bulk look like a system of nanocoils embedded in alumina matrix.
Keywords :
alumina; chromium compounds; cobalt compounds; iron compounds; magnetic particles; magnetic permeability; magnetic thin films; magnetoresistance; nanocomposites; nanoparticles; nitrogen; oxygen; percolation; soft magnetic materials; sputter deposition; superparamagnetism; (Co45Fe45Zr10)x(Al2O3)100-x; N2; O2; alumina matrix; current-conducting routes; equivalent circuits; film deposition; gas atmosphere; inductive contribution; magnetic films; magnetic state; magnetoimpedance; nanocoils; nanocomposites; nitrogen gas; oxygen gas; percolation threshold; permeability; soft magnetic nanoparticles; sputtering; superparamagnetic state; Atmosphere; Gases; Impedance; Iron; Magnetic films; Nanoparticles; Nitrogen; Soft magnetic materials; Sputtering; Zirconium; Nanocomposites; impedance; magnetic state; percolation; permeability;
Conference_Titel :
Nanotechnology, 2009. IEEE-NANO 2009. 9th IEEE Conference on
Conference_Location :
Genoa
Print_ISBN :
978-1-4244-4832-6
Electronic_ISBN :
1944-9399
