TY - JOUR
T1 - Tape-Head with Sub-Ambient Air Pressure Cavities
AU - Engelen, Johan B C
AU - Jonnalagadda, V. Prasad
AU - Furrer, Simeon
AU - Rothuizen, Hugo E.
AU - Lantz, Mark A.
PY - 2016/11/1
Y1 - 2016/11/1
N2 - A new tape-head design with surface cavities is presented as an alternative to the conventional skiving-edge flat-profile head design. The new head design is referred to as the vacuum head, inspired by the sub-ambient air pressure that develops in the surface cavities during operation. Two prototype head modules, a writer and a reader, were fabricated by modifying commercial tape-head modules and are compared with unmodified reference modules. A finite-element model is presented to simulate the head-tape interface and aid in the surface topography design of the vacuum head prototypes. The modeling results correspond qualitatively with experimental data from interferometer measurements of the shape of tape as it passes over the vacuum heads. The vacuum heads are operated successfully in data read/write experiments, with a slightly reduced signal-to-noise ratio performance compared with the reference heads. An indirect measure of head friction is obtained from tape velocity spectra that show a much reduced friction-induced compressional wave tape resonance for the vacuum modules compared with that for the reference modules. The results presented in this paper show that the new vacuum head design is a promising candidate for future heads with low friction, enabling the use of very smooth media for reduced magnetic spacing and increased areal densities.
AB - A new tape-head design with surface cavities is presented as an alternative to the conventional skiving-edge flat-profile head design. The new head design is referred to as the vacuum head, inspired by the sub-ambient air pressure that develops in the surface cavities during operation. Two prototype head modules, a writer and a reader, were fabricated by modifying commercial tape-head modules and are compared with unmodified reference modules. A finite-element model is presented to simulate the head-tape interface and aid in the surface topography design of the vacuum head prototypes. The modeling results correspond qualitatively with experimental data from interferometer measurements of the shape of tape as it passes over the vacuum heads. The vacuum heads are operated successfully in data read/write experiments, with a slightly reduced signal-to-noise ratio performance compared with the reference heads. An indirect measure of head friction is obtained from tape velocity spectra that show a much reduced friction-induced compressional wave tape resonance for the vacuum modules compared with that for the reference modules. The results presented in this paper show that the new vacuum head design is a promising candidate for future heads with low friction, enabling the use of very smooth media for reduced magnetic spacing and increased areal densities.
KW - Air-bearing interface
KW - head-tape interface
KW - magnetic data recording head
KW - tape recording
UR - http://www.scopus.com/inward/record.url?scp=84993993169&partnerID=8YFLogxK
U2 - 10.1109/TMAG.2016.2588479
DO - 10.1109/TMAG.2016.2588479
M3 - Article
AN - SCOPUS:84993993169
VL - 52
JO - IEEE transactions on magnetics
JF - IEEE transactions on magnetics
SN - 0018-9464
IS - 11
M1 - 7506243
ER -