Interparticle interactions in magnetic recording media as obtained from high-order measurements by a Preisach model

Generalized Delta M plots, which allow interactions to be investigated for any starting remanence state, have been used in the analysis of interaction s in particulate magnetic recording media for three samples [very high spee d (VHS) videotape, Ba-ferrite dispersed particles oriented and nonoriented] . The results have been interpreted using a generalized moving Preisach mod el. This gives a good fit to the hysteresis loops and Delta M plots. Howeve r, agreement with the generalized Delta M plots is less complete. This is i nterpreted in terms of a requirement for a magnetization dependent standard deviation in the generalized moving Preisach model. (C) 2000 American Inst itute of Physics. [S0021- 8979(00)03312-0].