Title :
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
fDate :
9/1/1989 12:00:00 AM
Abstract :
Five barium ferrite tapes were prepared from pigments similar except for coercivity (Hc). 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;
Journal_Title :
Magnetics, IEEE Transactions on
