• Title/Summary/Keyword: Kerr 회전각

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Effects of Sputtering Ar Pressure on Magnetic and Magneto-optical Propwrties in Compositionally Modulated Co/Pd Supwrlattice Thin Films (조성변조 Co/Pd 초격자 박막의 Ar가스 압력변화에 따른 자기 및 자기광학적 특성)

  • 김진홍;신성철
    • Journal of the Korean Magnetics Society
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    • v.2 no.2
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    • pp.119-124
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    • 1992
  • We have investigated the effects of sputtering Ar gas pressure on magnetic and magneto-optical properties in compositionally modulated Co/Pd superlattice thin films. The samples were prepared by dc magnetron sputtering from 2-in.-diam Co and Pd targets by alternately exposing the substrates to targets. Sputtering Ar gas pressure was varied from 2 to 30 mTorr. All samples had same bilayer thicknesses composed of 2-$\AA$-thick Co and 9-$\AA$-thick Pd sublayers. It was observed that the colum-nar structure was more distinctively developed with increasing Ar gas pressure. We observed that the intrinsic uniaxial anisotropy energy, magnetization and polar Kerr rotation were decreased with increasing Ar gas pressures. Large coercivity and perfect squareness were attained by the deposition at the high Ar gas pressure. We believe that the results are mainly ascribed the variation of micro-structure with sputtering Ar gas pressure.

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Thickness Optimization of TbFeCo Disks by Computer Simulation (컴퓨터 시뮬레이션에 의한 TbFeCo 광자기 디스크 두께 최적화)

  • 김진홍;권혁전;신성철
    • Journal of the Korean Magnetics Society
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    • v.4 no.3
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    • pp.249-255
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    • 1994
  • Magneto-optical disks with dielectric layers for optical tunning are useful for maximizing the SNR. We have developed a computer program based on characteristic matrix to investigate the best combination of the film thicknesses. We have optimized the thicknesses of the multilayers which were composed of TbFeCo, dielectric, and AI layers at the wavelengh of 830nm. The criterion for the optimization of the film thickness was to maximize the figure of merit with maintaining the low ellipticity and rmre than 10% reflectivity.

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Relationship between Sputtering Pressure of Underlayer and M-H Behavior in Co/Pd and Co/Pt Perpendicular Magnetic Recording Media (Co/Pd 및 Co/Pt 수직자가기기록매체에 있어서 바닥층의 스퍼터링 압력과 M-H 거동의 관계)

  • 오훈상;이병일;주승기
    • Journal of the Korean Magnetics Society
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    • v.6 no.4
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    • pp.235-241
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    • 1996
  • Co/Pd and Co/Pt multilayered thin films for perpendicular magnetic recording media were fabricated by sput¬tering method and the effects of the sputtering pressure during the formation of Pd or Pt underlayers on the magnetization behavior and coercivity of the multilayers were investigated. It was found that the coercivity of Co/Pd multilayers was strongly dependent on the sputtering pressure of underlayer and could be enhanced to a large extent merely by increasing the sputtering pressure of underlayer, while in case of Co/Pt films, the degree of coercivity enhancement by controlling the sputtering pressure of underlayer was almost negligible. Coercivity variation of Co/Pd and Co/Pt multilayers with the underlayer material and deposition pressure of underlayer could be well explained in terms of the interface roughness of multilayer films induced by underlayer topology, which could also be correlated to the change of perpendicular anisotropy energy and magnetic reversal feature with the sputtering pressure of underlayer. Kerr rotation angle was hardly affected by the preparation conditions of underlayers.

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Magneto-Optical Properties of Co-based MnSbPt Thin Films Prepared by RF Magnetron Sputtering (RF Magnetron Sputtering 으로 제작된 Co-based MnSbPt 합금박막의 자기광학적 성질)

  • Yun, Hyeon-Muk;Hong, Yeon-Gi;Lee, Gyeong-Jae;Kim, Jong-O
    • Korean Journal of Materials Research
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    • v.8 no.3
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    • pp.195-199
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    • 1998
  • Magnetic and Magneto-Optical properties of Co-based MnSbPt thin films prepared by R.F Sputtering were investigated. In this study, the optimum heat treatment condition was found to be $300^{\circ}C$-4hours under a $5\times10^{-6}$ Torr, but perpendicularly magnetized thin films could not be obtained. Coercive force showed maximum value of about 5000e at $250\AA$ Co thickness but the value is not enough for practical use of the thin film. Heat treated Co-based MnSbPt thin film shows 0.78 degree of Kerr rotation angle for 700nm of incident wavelength.

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Magneto-Optical Properties of MnSbPt Thin Films Prepared by RF Magnetron Sputtering (RF Magnetron Sputtering으로 제작된 MnSbPt 합금박막의 자기광학적 성질)

  • 송영민;이경재;김종오
    • Journal of the Korean Magnetics Society
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    • v.6 no.2
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    • pp.93-97
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    • 1996
  • The effects of annealing after deposition on the magnetic and magneto-optical properties of MnSbPt thin films prepared by rf sputtering were investigated. The MnSbPt alloy thin films were annealed in a vacuum with $10^{-5}$ Torr and the air, respectively, as a function of temperature and time. The films annealed at $300^{\circ}C$ for 4 hours was found to have the highest value of the saturation magnetization. The films annealed in the air did not show any thermal degradations, which indicates their chemical stability for the magneto-optical recording process. It was revealed that the $Mn_{43}Sb_{46}Pt_{11}$ films annealed at $300^{\circ}C$ for 4hours in a vacuum with $10^{-5}$ Torr exhibit high Kerr rotation angle of $0.8^{\circ}$ for the incident wavelength of 550nm, which is ascribed to the increase of the volume ratio of Clb phase. However, similar to the PtMnSb alloy thin films, these films are still horizontally magnetized and have the coercive field less than 400 Oe.

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