Co–Zn ferrite films prepared by facing targets sputtering system for longitudinal recording layer

• Published in: Journal of magnetism and magnetic materials Vol. 193; no. 1; pp. 68 - 70
• Main Authors: Matsushita, N., Ichinose, M., Nakagawa, S., Naoe, M.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01.03.1999; Elsevier Science
• Subjects: Applied sciences; Electronics; Exact sciences and technology; Facing targets sputtering system; Ferrite films; Longitudinal recording system; Magnetic devices; Other magnetic recording and storage devices (including tapes, disks, and drums); Perpendicular magnetization component; Read/write characteristics; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Longitudinal recording system; Read/write characteristics; Ferrite films; Facing targets sputtering system; Perpendicular magnetization component; Cobalt oxide; Thin film device; Iron oxide; Magnetization; Background noise; Experimental study; Sputtering; Thickness; Ferrites; Noise spectrum; Recording density; Magnetic disk; Manufacturing; Magnetic recording; Magnetic properties
• ISSN: 0304-8853
• DOI: 10.1016/S0304-8853(98)00404-1

Co–Zn ferrite films were deposited on glass ceramic disks of 1.89″ in diameter by the facing targets sputtering, and their read/write characteristics were evaluated using a merged type of MR head. Specimen disk with (1 1 1) orientation, Disk(1 1 1), possessed larger perpendicular magnetization component than disk with (311) orientation, Disk(3 1 1). The linear recording density D 50 increased with decrease of film thickness for both of these disks and the highest D 50 was 136 kfrpi for Disk(1 1 1) and 86 kfrpi for Disk(3 1 1), respectively. The reason why higher recording density was attained for Disk(1 1 1) seemed to be attributed to small 4 πM r δ and the significance of perpendicular magnetization component. The transition noise of Disk(1 1 1) was almost constant with the increase in recording density, while that for Disk(3 1 1) increased.