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Experimental study of the influence of particle size and switching field distribution on video tape output

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5 Author(s)
Auweter, H. ; BASF Aktiengesellschaft, Ludwigshafen, Germany ; Jachow, H. ; Jakusch, H. ; Schwab, E.
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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

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Magnetics, IEEE Transactions on  (Volume:27 ,  Issue: 6 )