Effect of pH on the interparticle magnetic interaction in ensembles of barium hexaferrite particles

Magnetic properties of Co, Ni and Zn substituted barium hexaferrite (BaM) samples prepared by solid state ceramic method were studied. Saturation magnetisation were found higher for Zn-substituted BaM, whereas, coercivity is higher for Co2+ and Ni2+ ion substituted samples. Anisotropy field for all substituted samples was calculated by the law of approaching saturation. Remanence, squareness and thermomagnetic plot suggest Zn2+ ions restricts the magnetic interaction of various sites in BaM.

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The effect of magnetic interaction in barium hexaferrite particles

Journal of Applied Physics ◽

10.1063/1.364778 ◽

1997 ◽

Vol 81 (8) ◽

pp. 3812-3814 ◽

Cited By ~ 7

Author(s):

M. Garcı́a del Muro ◽

X. Batlle ◽

A. Labarta ◽

J. M. González ◽

M. I. Montero

Keyword(s):

Barium Hexaferrite ◽

Magnetic Interaction

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Crystallization of barium hexaferrite

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100122216 ◽

1992 ◽

Vol 50 (1) ◽

pp. 362-363

Author(s):

Chung-kook Lee ◽

Yolande Berta ◽

Robert F. Speyer

Keyword(s):

Size Distribution ◽

Raw Materials ◽

Barium Hexaferrite ◽

Recording Media ◽

Magnetic Recording Media ◽

Promising Candidate ◽

Crystallization Method ◽

Temperature Heat ◽

High Density Magnetic Recording ◽

Temperature Heat Treatment

Barium hexaferrite (BaFe12O19) is a promising candidate for high density magnetic recording media due to its superior magnetic properties. For particulate recording media, nano-sized single crystalline powders with a narrow size distribution are a primary application requirement. The glass-crystallization method is preferred because of the controllability of crystallization kinetics, hence, particle size and size distribution. A disadvantage of this method is the need to melt raw materials at high temperatures with non-reactive crucibles, e.g. platinum. However, in this work, we have shown that crystal growth of barium hexaferrite occurred during low temperature heat treatment of raw batches.

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Structural Investigation of Iron Particles Used for Magnetic Recording Media

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s1431927600001732 ◽

1980 ◽

Vol 38 ◽

pp. 406-407

Author(s):

Alfred Baltz

Keyword(s):

Electron Microscopy ◽

Transmission Electron Microscopy ◽

Electron Microscope ◽

Structural Investigation ◽

Magnetic Interaction ◽

Recording Media ◽

Magnetic Recording Media ◽

Recording Medium ◽

Iron Particles ◽

Transmission Electron

As part of a program to develop iron particles for next generation recording disk medium, their structural properties were investigated using transmission electron microscopy and electron diffraction. Iron particles are a more desirable recording medium than iron oxide, the most widely used material in disk manufacturing, because they offer a higher magnetic output and a higher coercive force. The particles were prepared by a method described elsewhere. Because of their strong magnetic interaction, a method had to be developed to separate the particles on the electron microscope grids.

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