Recording characteristics for highly oriented Ba-ferrite flexible disks

• Published in: IEEE transactions on magnetics Vol. 27; no. 6; pp. 4960 - 4962
• Main Authors: Yamamori, K., Tanaka, T., Jitosho, T.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.11.1991; Institute of Electrical and Electronics Engineers
• Subjects: Coatings; Coercive force; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Demagnetization; Disk recording; Equalizers; Exact sciences and technology; Ferrites; Magnetic heads; Magnetic properties and materials; Magnetic properties of surface, thin films and multilayers; Physics; Saturation magnetization; Perpendicular anisotropy; Coercive force; Floppy disk; Experimental study; Barium Iron Oxides Mixed; Inorganic compound; Magnetic recording
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/20.278707

The effects of perpendicular orientation and coercivity on short wavelength recording characteristics for Ba-ferrite flexible disks (FDs) were investigated. The experimental results indicate that the short wavelength output is roughly proportional to S/sub perpendicular to / square root Hc/sub perpendicular to /, as long as the recording head is not saturated. The results show that the Ba-ferrite FD of Hc/sub perpendicular to /=1400 Oe, S/sub perpendicular to /=0.75, and Ms=120 emu/cc provides larger output than the metal FD of Hc=1560 Oe and Ms=200 emu/cc, at over 300 kFRPI. A novel simple recording method, which uses the FTE (ferrite trailing edge) head, was developed. With this method, the oriented Ba-ferrite FD provides slimmer and more symmetrical longitudinal-recording-like waveforms than the metal FD, without trading off the superior short wavelength output. The essential mechanism regarding how the FTE head works is assumed to be due to a time-lagged canceling effect for the perpendicular component of the remanent magnetization.< >