Title :
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
fDate :
9/1/1992 12:00:00 AM
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 (Cr1-x Fex)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;
Journal_Title :
Magnetics, IEEE Transactions on
