• Title/Summary/Keyword: recording properties

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The Modification of Magnetic Properties of Co73Pt27-TiO2 Perpendicular Magnetic Recording Media with Ga+ Ion Irradiation (Ga+ 이온 조사를 통한 Co73Pt27-TiO2 수직자기 기록매체의 자기적 특성 변화)

  • Kim, Sung-Dong;Park, Jin-Joo
    • Journal of the Korean Magnetics Society
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    • v.17 no.6
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    • pp.221-225
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    • 2007

  • The effects of $Ga^+$ ion irradiation on the magnetic properties of the $Co_{73}Pt_{27}-TiO_2$ perpendicular magnetic recording media were investigated. As $Ga^+$ ion dose increased from $1\times10^{15}ions/cm^2\;to\;30\times10^{15}ions/cm^2$, the perpendicular magnetic anisotropy was degraded and no longer observed above $20\times10^{15}ions/cm^2$ dose. The deterioration of the perpendicular magnetic anisotropy and ferromagnetic properties can be attributed to the concentration profile change due to Ga+ ion implantation. The magnetic islands of $70\times70nm^2\;and\;100\times100nm^2$ size were successfully fabricated with $Ga^+$ ion irradiation.

  • https://doi.org/10.4283/JKMS.2007.17.6.221 인용 PDF KSCI

Changes in Physical Properties of Jeungpyun During Fermentation (발효시간에 따른 증편의 물성변화)

  • 박영선;서정식
    • Korean journal of food and cookery science
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    • v.13 no.4
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    • pp.396-401
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    • 1997

  • Physical Properties of Jeungpyun product were analyzed during fermentation in the ranges of 0 to 10 hours. Penetration value of Jeungpyun sample measured by penetrometer was increased greatly according to the development of fermentation time, recording maximum value, 135 at 7 hours. Specific volume and total pore ratio were also increased greatly in course of fermentation time, recording maximum value, 3.5 ㎤/g-dry matter and 54.9％ at fermentation time, 6 hours and 4 hours respectively while they were decreased since then. Some remaining peaks on X-ray diffractogram were seen in all the Jeungpyun samples. Micropores and macropores were observed on cross-sectional view of all the fermented Jeungpyun samples.

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Magnetic Properties of Co-Cr Thin Films Deposited by FTS Method (FTS 방식으로 증착된 Co-Cr 박막의 자기적 특성)

  • Son, In-Hwan;Kim, Myung-Ho;Kong, Sok-Hyun;Kim, Kyung-Hwan;Nakagawa, S.;Naoe, M.
    • Proceedings of the KIEE Conference
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    • 1998.07d
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    • pp.1279-1281
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    • 1998

  • The Co-Cr thin films are one of the most suitable candidates for perpendicular magnetic recording media. The facing targets sputtering(FTS) method has a advantage of preparing films over a wide range of working gas pressure on plasma-free substrates. In this study, we investigated the possibility of employing FTS system for depositing Co-Cr films, Co-Cr thin films were deposited with continuously sputter gas pressure ($P_{Ar}$ = 0.1 mTorr) by FTS method at temperature of $40^{\circ}C$. We find that the change of thickness and deposition rate of sputtered Co-Cr thin films affect crystal orientation and magnetic properties. Crystallographic and magnetic properties were evaluated by x-ray diffractometry(XRD) and vibrating sample magnetometer(VSM) respectively. It has been confirmed that the FTS method is very useful for preparing Co-Cr thin film recording media.

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