Perpendicular recording

Fig. 7. Principle perpendicular recording for a ring head and a head consisting of a single pole with an auxiHary pole.

Fig. 8. The main-pole driven head in combination with a Co—Cr/Ni—Fe double-layer medium for perpendicular recording.

Go Binary and Ternary Alloyed Thin Films. Most of the thin-film media for longitudinal and perpendicular recording consist of Co—X—Y binary or ternary alloys. In most cases Co—Cr is used for perpendicular recording while for the high density longitudinal media Co—Cr—X is used X = Pt, Ta, Ni). For the latter it is essential to deposit this alloy on a Cr underlayer in order to obtain the necessary in-plane orientation. A second element combined with Co has important consequences for the Curie temperature (T ) of the alloy, at which the spontaneous magnetisation disappears. The for... 

PR = perpendicular recording LR = longitudinal recording HFRH = high frequency recording heads RH/HDTV = recording heads for high definition television and Pa = perpendicular perpendicular anisotropy. 

Fig. 33—Magnetic recording technologies longitudinal versus perpendicular recording.

In the perpendicular recording, the magnetic polarity is perpendicular to the media surface and can be read with a GMR sensor similar to the sensor used in LMR. In this case, the media is effectively situated within the head gap, potentially relaxing many limits on both head and media design experienced in longitudinal recording. 

Beyond perpendicular recording, technologists have already begun to explore alternative methods of recording technology-... 

T. Wielinga, Investigations on Perpendicular Recording Ph.D. dissertation, University of Twente, Enschede, the Netherlands, 1983. 

Double-Layered Zl0 FePtrC/FeCoNi Perpendicular Recording Media... 

These results suggest that nonepitaxially grown, (001) textured doublelayered nanocomposite Zl0 Fe(Co)Pt-based films with perpendicular anisotropy are a promising candidate to realize extremely high-density perpendicular recording. 

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