Magnetic properties and longitudinal recording performance of corrosion-resistant alloy films

• Published in: IEEE transactions on magnetics Vol. 22; no. 5; pp. 352 - 354
• Main Authors: Fisher, R., Allan, J., Pressesky, J.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01-09-1986; Institute of Electrical and Electronics Engineers
• Subjects: Analysing. Testing. Standards; Applied sciences; Chromium alloys; Coercive force; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Corrosion; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Magnetic films; Magnetic properties; Magnetic properties and materials; Magnetic properties of surface, thin films and multilayers; Magnetic recording; Materials science; Measurement of properties and materials state; Metals, semimetals and alloys; Metals. Metallurgy; Nondestructive testing; Perpendicular magnetic recording; Physics; Saturation magnetization; Specific materials; Sputtering; Temperature; Thickness; Corrosion resistance; Magnetization; Transition metal Alloys; Coercive force; Experimental study; Thin film; Magnetic recording
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.1986.1064593

This paper describes the magnetic properties, recording performance and corrosion resistance of sputtered CoCr alloy films and CoCrTa alloy films. The saturation magnetization of CoCr was 525 emu/cc and not affected by substitution of a small amount of Ta. CoCrTa films exhibit greater coercive force values than CoCr films. The maximum coercive force of CoCrTa was 1400 Oe at a thickness of 400A, whereas at a similar thickness the coercive force of CoCr was 900 Oe. The coercive force decreases linearly with temperature (25°C. to 125°C.) at a rate of 3.16 Oe/°C. for CoCrTa and 1.87 Oe/°C. for CoCr. Longitudinal recording performance at -3 dB signal level was 8386 flux reversals/cm (21,300 fci) and 11,063 flux reversals/cm (28,100 fci) for CoCr and CoCrTa respectively. The alloys exhibited corrosion resistance at 80% relative humidity and 65° C. for a two-week period equivalent to at least six years under ambient disc drive conditions.