• Title/Summary/Keyword: 수직자기기록

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A study on the Magnetic Properties of Co-Cr-Ta Thin Films for Perpendicular Magnetic Recording (수직자기기록용 Co-Cr-Ta 박막의 자기적 성질에 대한 연구)

  • 황충호;박용수;장평우;이택동
    • Journal of the Korean Magnetics Society
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    • v.3 no.1
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    • pp.41-47
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    • 1993

  • Effects of Ta addition on Co-Cr pependicular magnetic recording media were studied to obtain high perpen-dicular coercivity at lower substrate temperature. For the purpose. magnetic properties and microstructures of Co-Cr-(Ta) films were studied by varying the Cr contents from 17 to 21 at.% and Ta contents for 0 to 3.2 at.%. Effectiveness of Ta addition in increasing perpendicular coercivity was significant for lower Cr content films. The increasement of perpendicular coercivity was more pronounced for the films deposited on $100^{\circ}C$ heated substrate in the case of ${(Co_{83}Cr_{17})}_{98.4}Ta_{1.6}$ composition. The cause of the increase of perpendicular coercivity was considered due to not the grain refinement effects and the improvement of c-axis alignments but increase of Ta and Cr segregation.

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Enhancement for Magnetic Property of Ba-ferrite for Perpendicular Magnetic Recording Using Ultrasonic Dispersion (초음파 분산에 의한 수직자기기록용 Ba-ferrite의 자기적 특성 향상)

  • Choi, Hyun-Seung;Kim, Chang-Gon;Jang, Hak-Jin;Jung, Ji-Hyung;Yoon, Seog-Young;Kim, Tae-Ok
    • Journal of the Korean Ceramic Society
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    • v.39 no.8
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    • pp.758-763
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    • 2002

  • 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.

  • https://doi.org/10.4191/KCERS.2002.39.8.758 인용 PDF KSCI