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

fYear

2009

fDate

26-30 July 2009

Firstpage

651

Lastpage

654

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 x_C 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;

fLanguage

English

Publisher

ieee

Conference_Titel

Nanotechnology, 2009. IEEE-NANO 2009. 9th IEEE Conference on

Conference_Location

Genoa

ISSN

1944-9399

Print_ISBN

978-1-4244-4832-6

Electronic_ISBN

1944-9399

Type

conf

Filename

5394831