NEUTRON DEPOLARIZATION AND NOISE STUDIES OF BA-FERRITE TAPES AS A FUNCTION OF MILLING TIME

Ba-ferrite particles have been dispersed and coated onto polyethylene terephthalate (PET) film and the magnetic structure investigated using a range of magnetic measurements including noise studies and neutron depolarisation (ND), Noise measurements were made on lengths of tape f or samples cycled through Isothermal Remanent Magnetisation (IRM) and DC Demagnetisation (DCD) measurement processes and interpreted in term s of the total noise power and spectral response. ND measurements were analysed in terms of magnetic correlations within the films, Total no ise power exhibited a minimum around the remanent coercivity (H-r), as observed for most particulate media, ND values of correlation functio n, zeta displayed a peak rather than a dip around H-r, The similarity in the respective peak/dip positions indicates that both measurement t echniques were sensitive to the same micro-structural details.