Title :
Effects of polymeric substrate roughness on head-medium spacing and recording properties of sputtered magnetic tape
Author :
Lee, Hwan-Soo ; Bain, James A. ; Laughlin, David E.
Author_Institution :
Data Storage Syst. Center, Carnegie Mellon Univ., Pittsburgh, PA, USA
Abstract :
We investigated the spacing dependence of recording characteristics on head-medium spacing due to the surface roughness of substrates. CoCrPt-sputtered tape media with a magnetic thickness of 25 nm were deposited onto polymeric substrates possessing very different roughnesses for this investigation. The degradation in the write and read processes due to spacing was a significant limiting factor at high densities. By utilizing smooth polymeric substrates, a substantial improvement in system bandwidth as well as effective write field gradient can be achieved. As a result, overwrite performance was also considerably improved over the frequency range of interest.
Keywords :
chromium alloys; cobalt alloys; magnetic heads; magnetic recording; magnetic tapes; platinum alloys; polymer films; surface roughness; 25 nm; CoCrPt; head-medium spacing; magnetic heads; magnetic recording; polymer films; polymeric substrate roughness; recording properties; smooth polymeric substrates; spacing dependence; sputtered magnetic tapes; sputtered tape media; surface roughness; write field gradient; Frequency; Magnetic heads; Magnetic noise; Magnetic properties; Magnetic recording; Noise level; Polymers; Rough surfaces; Surface roughness; Surface topography; Effective write field gradient; overwrite; smooth polymeric substrates; spacing dependence; sputtered tape media;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2005.854330