Mossbauer study on the distribution of iron in high coercivity chromium dioxide particles

Author

Ensling, J. ; Gutlich, P. ; Klinger, R. ; Meisel, W. ; Jachow, H. ; Schwab, E.

Author_Institution

Inst. fuer Anorganische und Anal. Chemie, Mainz Univ., Germany

Volume

28

Issue

5

fYear

1992

fDate

9/1/1992 12:00:00 AM

Firstpage

2680

Lastpage

2682

Abstract

⁵⁷Fe Mossbauer spectroscopy is applied to determine the level of iron doping in high-coercivity CrO₂ particles. It is found that, compared with the conventional preparation process, the particles contain an increased amount of Fe³⁺ ions in the CrO ₂ crystal lattice, giving rise to higher magnetocrystalline anisotropy. This is reflected in coercivities up to over 900 Oe. All samples contain as a secondary iron-containing phase some (Cr_1-xFe_x)₂O₃. The valence of the iron doping is predominantly +3; very weak signals in the Mossbauer spectra suggest the existence of Fe⁴⁺ in an amount 2-3% of the total number of iron atoms

Keywords

Mossbauer effect; chromium compounds; coercive force; ferromagnetic properties of substances; impurity distribution; iron; magnetic anisotropy; magnetic properties of fine particles; magnetic recording; CrO₂:Fe high coercivity particles; Fe³⁺ ions; Fe⁴⁺; Mossbauer spectroscopy; coercivities; high density recording media; impurity distribution; magnetocrystalline anisotropy; weak signals; Anisotropic magnetoresistance; Atomic measurements; Chromium; Coercive force; Demagnetization; Doping; Iron; Lattices; Magnetic analysis; Spectroscopy;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.179595

Filename

179595