Title :
Experimental study of the influence of particle size and switching field distribution on video tape output
Author :
Auweter, H. ; Jachow, H. ; Jakusch, H. ; Schwab, E. ; Veitch, R.J.
Author_Institution :
BASF Aktiengesellschaft, Ludwigshafen, Germany
fDate :
11/1/1991 12:00:00 AM
Abstract :
With recorded wavelengths well under 1 micron the geometric dimensions of the particles start to have significant influence on the output of particulate media. The recorded wavelengths of well under 1 micron being used in video storage approach the length dimensions of standard recording pigments. As a single domain particle cannot support a magnetic transition along its length, the finite length of the particle leads to a reduction in the maximum output signal analogous to the gap loss function and known as length loss. At the same time also the magnetic homogeneity as expressed by (1-S*) becomes increasingly important. The authors experimentally verify the theoretical predictions regarding the influence of the particle parameters by measuring different sets of experimental tapes prepared with appropriate pigment samples
Keywords :
chromium compounds; coercive force; magnetic properties of fine particles; magnetic recording; magnetic switching; magnetic tape storage; magnetisation; remanence; video recording; CoFe2O3; CrO2; CrO2-CoFe2O3; coercivity; gap loss function; geometric dimensions; length loss; magnetic homogeneity; magnetic transition; magnetisation; particle parameters; particle size; pigment samples; recorded wavelengths; remanence; single domain particle; standard recording pigments; switching field distribution; video storage approach; video tape output; Cobalt; Coercive force; Iron; Magnetic domains; Magnetic heads; Magnetic recording; Perpendicular magnetic recording; Pigments; Shape; Video recording;
Journal_Title :
Magnetics, IEEE Transactions on