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http://dx.doi.org/10.4191/KCERS.2002.39.8.758

Enhancement for Magnetic Property of Ba-ferrite for Perpendicular Magnetic Recording Using Ultrasonic Dispersion  

Choi, Hyun-Seung (Schools of Materials Science and Engineering, Pusan National University)
Kim, Chang-Gon (Schools of Materials Science and Engineering, Pusan National University)
Jang, Hak-Jin (Schools of Materials Science and Engineering, Pusan National University)
Jung, Ji-Hyung (Schools of Materials Science and Engineering, Pusan National University)
Yoon, Seog-Young (Schools of Materials Science and Engineering, Pusan National University)
Kim, Tae-Ok (Schools of Materials Science and Engineering, Pusan National University)
Publication Information
Journal of the Korean Ceramic Society / v.39, no.8, 2002 , pp. 758-763 More about this Journal
Abstract
The various ultrasonic energies (28 kHz, 40 kHz, 70 kHz) were used to improve the magnetic properties of Ba-ferrite as the perpendicular magnetic recording materials. In the sheet formation process, the different orientation hars were used to orientate perpendicularly the dispersed Ba-ferrite to sheet. Throughout these experiments, we have obtained relatively higher value of S. Q. (Squreness Ratio : 0.783) and O. R. (Orientation Ratio : 2.87) magnetic properties at 2 h ultrasonic treatment of 40 kHz ultrasonic energy. With aid of SEM(Scanning Electron Microscopy) images, the obtained sheet with dispersed of Ba-ferrite could be used for perpendicular magnetic recording due to orientated to easy magnetization axis, c-axis. In addition, the value of S. Q. of sheet decreased with increasing applied magnetic field angle during measuring of S. Q. value with changing applied magnetic field angle by VSM (Vibrating Sample Magnetrometer). This result also induced the probability for prependicular magnetic recording.
Keywords
Ultrasonic dispersion; Squareness ratio (S.Q.); Orientation ratio (O.R.); Orientation bar;
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