Magnetic properties of Ba-ferrite powders prepared by surfactant assisted ball milling

Author

Kaczmarek, W.A. ; Ninham, B.W.

Author_Institution

Res. Sch. of Phys. Sci. & Eng., Australian Nat. Univ., Canberra, ACT, Australia

Volume

30

Issue

2

fYear

1994

fDate

3/1/1994 12:00:00 AM

Firstpage

717

Lastpage

719

Abstract

Magnetic properties of Ba-ferrite powders processed by a novel method: surfactant assisted low energy ball milling, are discussed. By using cationic and anionic surfactants at pH values above and below the point of zero charge of the oxide surface, some remarkable changes in magnetic properties of the milled material are produced. Vibrating sample magnetometry (VSM) and ferromagnetic resonance are applied for sample evaluation. Directly after milling the particles are in the submicron range with a narrow size distribution. By application of an annealing procedure in air or vacuum to prepared powders changes were observed. Final annealing in air of the samples annealed first in vacuum produces Ba-ferrite powder with m_oM_s and H_c values in a remarkably broad range 0.457-0.564 T, and 136-195 kA/M respectively

Keywords

annealing; barium compounds; ferrites; ferromagnetic resonance; magnetic properties of fine particles; powder technology; powders; 0.457 to 0.564 T; BaFe₁₂O₁₉; BaFe₁₂O₁₉ powders; annealing; ferromagnetic resonance; surfactant assisted ball milling; vibrating sample magnetometry; Annealing; Ball milling; Magnetic anisotropy; Magnetic materials; Magnetic properties; Magnetic resonance; Perpendicular magnetic anisotropy; Powders; Saturation magnetization; Surface morphology;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.312386

Filename

312386