Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
권호 표지
DOI QR코드

DOI QR Code

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 (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)
  • 최현승 (부산대학교 무기재료공학과) ;
  • 김창곤 (부산대학교 무기재료공학과) ;
  • 장학진 (부산대학교 무기재료공학과) ;
  • 정지형 (부산대학교 무기재료공학과) ;
  • 윤석영 (부산대학교 무기재료공학과) ;
  • 김태옥 (부산대학교 무기재료공학과)
  • Published : 2002.01.01
Download PDF
⟨ Previous Next ⟩

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.

초음파 에너지(28 kHz, 40 kHz, 70 kHz)를 사용하여 수직자기기록용 Ba-ferrite의 자기적 특성 향상에 대하여 조사하였다. 한편, 분산된 Ba-ferrite를 sheet에 수직으로 배향시키기 위해 다양한 형태의 배향기들을 사용하여 실험을 행하였다. Ba-ferrite가 도포된 sheet 중 초음파 에너지가 40 kHz이고 초음파 처리 시간이 2시간에서 자기적 특성인 S. Q. (Squareness Ratio)와 O. R. (Orientation Ratio)값이 각각 0.7831과 2.87로 비교적 좋은 값을 얻을 수 있었다. 이때 얻어진 sheet의 표면 형상을 SEM(Scanning Electron Microscopy)으로 분석한 결과 Ba-ferrite가 자화용이축인 c 축에 수직방향으로 배향되어 수직자기기록용으로서의 응용에 가능성을 보였다. 또한, VSM(Vibrating Sample Magnetometer)으로 자기장의 각도변화에 따른 S. Q.의 측정시, 자기장의 각도가 증가함에 따라 S. Q. 값이 감소하였고 이는 수직자기기록용으로써 가능성을 재확인 시켜주었다.

Keywords

References

  1. T. W. McDaniel, K. A. Rubin and B. I. Finkelstem, 'Optimum Design of Optical Storage Media for Drive Compatibility,' IEEE Trans. Maen., 30 [6] 4413-15 (1994) https://doi.org/10.1109/20.334105
  2. E. S. Murdock, R. F. Simmons and R. Davidson, 'Roadmap for 10 Gbit/$in^2$ Media: Challenges,' IEEE Trans. Magn., 28 [8] 3078-81 (1992) https://doi.org/10.1109/20.179719
  3. M. R. Kim, 'Phase-change Optical Media for Computer Data Storage,' J. K1EEME, 8 [2] 229-36 (1995)
  4. M. Camras, Magnetic Recoarding Handbook, pp. 1-11, Van Nostrand Reinhold Company Inc., New York, 1988
  5. P. Ciureanu and H. Gavrila, Magnetic Heads for Digital Recording, pp. 3-7, Elsevier Science Publishing Company Inc., New York, 1990
  6. M. Kishimoto, S. Kitahata and M. Amemiya, 'Morphology and Properties of the Iron Oxide Layer Formed on Iron Adcular Particles,' IEEE Trans. Maen., 22 [5] 732-34 (1986) https://doi.org/10.1109/TMAG.1986.1064554
  7. E. V. Keuren, A. B. Bortz and S. H. CharaP, 'Effect of Orienting Field on Agglomeration in Dilute Dispersions of Magnetic Fine Particles,' IEEE Trans. Magn., 27 [4] 3700-03 (1991) https://doi.org/10.1109/20.102940
  8. S. Aoyama and M. Kishimoto, 'The Behavior of Lauric Acid Lubricant in a Magnetic Coating Layer and its Effect on Mechanical Properties of Magnetic Media,' IEEE Trans. Magn., 27 [2] 791-94 (1991) https://doi.org/10.1109/20.133293
  9. R. J. Veitch, E. Held, H. Jakusch and R. $K\ddot{o}rner$, 'Chromium Dioxide Recording Tape with an Extremely narrow Switching Field Distribution,' IEEE Trans. Magn., 29 [6] 3637-39 (1993) https://doi.org/10.1109/20.281254
  10. W. G. Peng, S. S. Wong, Y. S. Lin and C. D. Wu, 'Magnetic Orientation of Acicular Iron Particle in Recording Media,' IEEE Trans. Magn., 28 [5] 2377-79 (1992) https://doi.org/10.1109/20.179497
  11. M. C. A. Mathur, G. F. Hudson, R. J. Martin, W. A. Mckinley and L. D. Hackett, 'Kinetic Studies of Iron Metal Particle Degradation at Various Temperature and Humidity Conditions,' IEEE Trans. Magn., 27 [6] 4675-77 (1991) https://doi.org/10.1109/20.278913
  12. K. Tagawa, M. Matsunaga, K. Ohshima, M. Hiramatsu, T. Ishibashi and J. Mikami, 'Annealing Effect of Oxidized $\alpha$-Fe Particles,' IEEE Trans. Magn., 22 [5] 729-31 (1986) https://doi.org/10.1109/TMAG.1986.1064324
  13. S. Iwasaki and Y. Nakamura, 'An Analysis for the Magnetization Mode for High Density Magnetic Recording,' IEEE Trans. Magn., 13 [5] 1272-77 (1977) https://doi.org/10.1109/TMAG.1977.1059695
  14. S. Iwasaki, 'Perpendicular Magnetic Recording,' IEEE Trans. Magn., 16 [1] 71-6 (1980) https://doi.org/10.1109/TMAG.1980.1060546
  15. N. Sugita, M. Maekawa, Y. Ohta, K. Okinaka and N. Nagai, 'Advances in fine Magnetic Particles for High Density Recording,' IEEE Trans. Magn., 31 [6] 2854-58 (1995) https://doi.org/10.1109/20.490174
  16. T. B. Byeon, W. D. Cho and T. O. Kim, 'Preparation Of Barium Ferrite Thin Film by Sol-gel Method,' J. Kor. Ceram. Soc., 34 [1] 37-44 (1997)
  17. T. O. Kim, 'Comparision Between Synthesis Processes of Ba-ferrite from Coprecipitates $Fe(OH)_2-BaCO_3$ and $Fe(OH)_3$-$BaCO_3$,' J. Kor. Ceram. Soc., 19 [3] 223-28 (1982)
  18. K. H. Lee, B. H. Lee and K. J. Yoon, 'Condition for the Formation of Ba-ferrite by Hydrothermal Synthesis,' J. Kor. Ceram. Soc., 37 [5] 181-85 (2000)
  19. C. G. Kim, H. S. Choi, H. J. Jang, S. Y. Yoon and T. O. Kim, 'Study on Magnetic Property Enhancement of Metal Powders for Magnetic Tape by Using Ultrasonic Dispersion,' J. Kor. Mater. Res., 11 [11] 972-77 (2001)
  20. F. Jorgensen, The Complete Handbook of Magnetic Recording, pp. 346-48, The McGraw-Hill Company Inc., New York, 1995
  21. S. Chikazumi, Physics of Ferromagnetism, pp. 509-16, Oxford University Press Inc., New York, 1997