An analysis of magnetization processes in metal evaporated tape

Metal Evaporated Media

“…Conditions can be met such that "reverse writing" occurs at the top of the medium but not deep into the medium. With the possibility of "reverse writing," recording in the direction A will consequently be more sensitive to angular and anisotropy distributions, and this can lead to partial erasure of the medium as described theoretically ( Jubert et al, 2010;Richter, 1993b;Stupp, 1996) and observed experimentally ( Jubert et al, 2010). This effect set an upper bound on the desirable tilt angle for obliquely evaporated media.…”

“…Such recording anisotropy is a direct consequence of the tilted anisotropy of the magnetic film. The recording asymmetry of media with tilted anisotropy has successfully been explained on the basis of macroscopic recording models Krijnen et al, 1988;Nouchi et al, 1986;Richter, 1993b;Stupp et al, 1993Stupp et al, , 1994. In this section, we describe these models to provide some basic understanding of the recording physics of the obliquely evaporated media.…”

“…It is also useful to consider the write field amplitude versus the write field angle and compare it to the angular variation of the medium switching field (Richter, 1993b). Such representation allows clear visualization of the angles at which writing is performed, and to understand some particularities of recording with tilted anisotropy media.…”

“…The discussion above gives a phenomenological description of the recording process. To evaluate quantitatively the transition width written into tilted medium, self-consistent macroscopic models have been developed based on the extension of the Williams-Comstock model (Williams and Comstock, 1971) for arbitrary axis orientation (Cumpson et al, , 1997Richter, 1993bRichter, , 1997Stupp et al, 1993Stupp et al, , 1994. The initial developments of the model were 1D Richter, 1993b;Stupp et al, 1993).…”

“…tot , is the sum of the head field (H x , H z ) and of the medium self-demagnetizing field (H d,x ,H d,z ). In one model (Richter, 1993b), the effective write fields are assumed to be along the direction given by the write angle y w . In that case…”