The effect of coercivity on short wavelength output for barium ferrite particulate tapes

Author

Wollack, Edward F. ; Erkkila, Ruth M. ; Mitchell, Thomas C.

Author_Institution

3M Co., Saint Paul, MI, USA

Volume

25

Issue

5

fYear

1989

fDate

9/1/1989 12:00:00 AM

Firstpage

4054

Lastpage

4056

Abstract

Five barium ferrite tapes were prepared from pigments similar except for coercivity (H_c). These tapes had their greatest squareness ratio in the longitudinal direction. The short wavelength output was measured on two different systems. With barium ferrite particles of 0.05-μm diameter it is possible to make tape with a longitudinal squareness ratio of 0.68 and good surface smoothness. On an experimental test apparatus (a drum tester) the output was the same for all tapes, similar to the results reported by M. Isshiki et al. (1985). However, on an 8-mm video system the peak output increased as the pigment coercivity increased from 625 to 1100 Oe

Keywords

barium compounds; coercive force; ferrite applications; magnetic properties of fine particles; magnetic tapes; 0.05 micron; BaFe₁₂O₁₉ particulate tapes; coercivity; drum tester; ferrite tapes; particle diameter; peak output; pigments; short wavelength output; squareness ratio; surface smoothness; video system; Barium; Coercive force; Current measurement; Ferrites; Laboratories; Magnetic heads; Pigments; Testing; Video recording; Wavelength measurement;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.42520

Filename

42520