Title :
Magnetic properties of particles formed by H2 reduction of Co-ferrite or γ-FeOOH particles wrapped with exfoliated MoS2
Author :
Templeton, T.L. ; Yoshida, Y. ; Li, X.Z. ; Arrott, A.S. ; Curzon, A.E. ; Hamed, F. ; Gee, M.A. ; Schurer, P.J. ; LaCombe, J.L.
Author_Institution :
Dept. of Phys., Simon Fraser Univ., Burnaby, BC, Canada
fDate :
11/1/1993 12:00:00 AM
Abstract :
Fine particles of α-Fe or Fe(Co) are prepared by the reduction in H2 of γ-FeOOH or Co-ferrite particles which have been wrapped in monomolecular layers of exfoliated MoS2 . The presence of the MoS2 restricts coalescence of the starting particles while allowing the reduction to take place. Magnetic moments and coercivities are determined at temperature during processing. Results are given for magnetization measurements, electron microscopy, Mossbauer effect spectroscopy, and X-ray diffraction. Enhanced coercivities are observed when MoS2 is present. Surface pinning is deduced from the approach to magnetic saturation
Keywords :
Mossbauer effect; X-ray diffraction examination of materials; cobalt alloys; coercive force; ferromagnetic properties of substances; iron; iron alloys; magnetic moments; magnetic properties of fine particles; powder metallurgy; transmission electron microscope examination of materials; γ-FeOOH; Co-ferrite particles; CoFe2O4; Fe(Co) particles; H2 reduction; Mossbauer effect spectroscopy; X-ray diffraction; alpha Fe particles; coalescence; coercivities; electron microscopy; exfoliated MoS2; gamma FeOOH; magnetic moments; magnetic properties; magnetic saturation; magnetization measurements; monomolecular layers; surface pinning; temperature; Coercive force; Hydrogen; Magnetic anisotropy; Magnetic materials; Magnetic properties; Perpendicular magnetic anisotropy; Saturation magnetization; Suspensions; Temperature; Wrapping;
Journal_Title :
Magnetics, IEEE Transactions on
