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原稿種別: 表紙
1996 年 20 巻 61 号 p.
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原稿種別: 目次
1996 年 20 巻 61 号 p.
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Zheng YANG, Fulin WEI, ChangSheng WANG, HuaXian ZENG
原稿種別: Article
1996 年 20 巻 61 号 p.
1-6
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The formation process of Zn-Ti doped Ba-ferrite particle was investigated by the x-ray diffraction technique, transmission electron microscopy and magnetic measurements. The effects of heating temperature T_h and the Zn-Ti substution x on microstructure and magnetic properties of BaFe_<12-2x> Zn_x Ti_x O_<19> particles with x=0.10-0.80 were studied. The temperature dependence of magnetic properties of these particles was measured.
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上坂 保太郎, 高橋 由夫, 仲谷 栄伸, 林 信夫, 福島 宏
原稿種別: 本文
1996 年 20 巻 61 号 p.
7-12
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モンテカルロ法によるシミュレーションにより、垂直記録媒体および、長手記録媒体の磁化の熱揺らぎの影響を検討した。その結果、結晶粒サイズの分布は磁化の熱揺らぎに大きく影響すること、垂直記録の方が長手記録よりも優れていること、また、長手記録では記録密度が向上するにつれて熱揺らぎの影響が大きくなるが、垂直記録の場合には、逆に、記録密度が向上するにつれて熱揺らぎの影響が小さくなることが明らかになった。
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鈴木 俊行, 三次 朋広
原稿種別: 本文
1996 年 20 巻 61 号 p.
13-18
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本論文では、Co-Fe oxide, CrO_2,厚さの異なる2種類のMPテープを用いて、塗布型媒体の熱安定性について調べた。まず、室温における磁気粘性を測定すると揺らぎ場は減磁曲線上の反転磁界の関数として得られ、反転磁界が保磁力と等しくなる時揺らぎ場は最小値をとることが判った。これに基づき、周囲温度-75℃〜100℃で4つの磁気テープの揺らぎ場の測定を行った。その結果、揺らぎ場を残留保磁力で規格化した値は、すべての媒体において温度上昇にともなって増大し、熱安定性の重要な指標となることが判った。さらに、活性化体積についても同様な検討を行なった。
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Bo LIU, ShengBin HU, SueTeck LIM, Gang SHENG, Dan WEI, KianThiam SOO, ...
原稿種別: Article
1996 年 20 巻 61 号 p.
19-27
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Skew angle and its effect to the head-disk integration for the Gb/sq-in areal density recording were studied systematically and reported. The results presented in this paper covers the skew angle effect on read/write performance, bit and track densities, landing zone tribology performance, off-track capability, noise and so on. High skew angle reduces the potential of bit density, increases the noise level, and increases the long term stiction in the take-off process in the landing zone. Isotropic and anisotropic media were studied on the skew angle effect. Media with different orientation ratio were used in the investigation.
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JungHyuk Koh, InSeon Lee, TaekDong Lee
原稿種別: Article
1996 年 20 巻 61 号 p.
29-33
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As recording density increases rapidly in recent years, high coercivity and low noise media became more an important issue in perpendicular as well as longitudinal recording media. Compare to CoCr, CoCrTa system is more effective in increasing coercivity by enhancing Cr segregation into column boundaries. There was no improvment in C-axis alignment in the case of CoCrTa when Ti underlayer was used. In the case of CoCrPt case, when Pt content is lower, coercivity was not improved and M-H curve showed more domain wall motion type reversal indicating rather strong magnetic coupling among columns. When Ta is added in CoCrPt, coercivity increased and M-H curve showed domain wall motion type behavior was reduced, which must be associated with Cr segregation to boundary by Ta addition.
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Hung Jae CHO, Nam Chol CHO, In Tak NAM
原稿種別: Article
1996 年 20 巻 61 号 p.
35-40
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The magnetic properties change which was induced by a small amount of Ni addition into Cr underlayer and heat treatment in CoCrTa/CrNi thin film deposited by electron beam evaporator was investigated. The additional Ni element was found to be beneficial for increase in the coercivity of the film. The origin of coercivity increase was elucidated by crystal orientation and microstructure investigation using XRD and AFM respectively. It was found that the intensity of Cr (110) peak and the grain size were increased by Ni addition into the underlayer. The higher coercivity is related to the increase of Cr (110) peak in the underlayer and the reduction of Co (0002) peak in the magnetic layer. Coercivity was also increased after heat treatment above 400℃. The increase in coercivity may be resulted from the enhancement of Cr segregation by diffusion of Cr into the magnetic layer from underlayer.
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駒木根 隆士, 本多 直樹, 大内 一弘
原稿種別: 本文
1996 年 20 巻 61 号 p.
41-46
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垂直配向薄層塗布型Baフェライトフレキシブル媒体の記録再生特性を、狭ギャップ長・狭トラック幅のハードディスクドライブ用MIGリングヘッドを用いて評価した。再生出力、半値記録密度D_<50>は垂直方向M-H曲線の角型比SQ_⊥とともに増加し、SQ_⊥=0.87に対し、D_<50>=180kFRPIが得られた。100kFRPIの記録信号のS_<pp>/N_<rms>比はトラック幅6μmにおいて33dBと見積もられ、これは高密度メタル塗布ディスク媒体に比べ約8dB高い。この記録再生系においては面記録密度は300Mbit/in^2以上が期待できる。SQ_⊥の増加とともに媒体ノイズの増加が見られたが、塗布技術の改善により低減可能と考えられる
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二本 正昭, 稲葉 信幸, 中村 敦
原稿種別: 本文
1996 年 20 巻 61 号 p.
47-53
発行日: 1996/11/21
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Co系磁性膜の一軸磁気異方性定数(Ku)や減衰定数(α)などの物性値を正確に決定するために、単結晶磁性薄膜成長を行なった。Mg0(110), (100)基板上にエピタキシャル成長させたCrもしくはCr合金下地上にCo系磁性膜を形成することにより、(11^^-00)もしくは(112^^-0)配向した単結晶あるいはバイクリスタル結晶膜が得られた。磁気トルク法によりKuの値を、FMR法によりαの値を決定した。CoCrPt磁性膜と下地のCr-Ti膜の格子定数のミスマッチとKuの関係を調べ、hcp結晶の歪みが最小の時に、最大のKu値が得られることを明らかにした。さらに、MgO(100)単結晶ディスク基板上にバイクリスタルCoCrPt膜を形成して磁気記録を行ない、磁性膜の結晶方位と磁気記録の分解能やノイズの関係を調べた。
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Jinyue Yu, Di Zhou, Yong Zhou, Fulin Wei
原稿種別: Article
1996 年 20 巻 61 号 p.
55-59
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With regard to practical structure of element, the transition process of domain structure during magnetizatization reversal in MR thin film sensor has been observed and investigated by wet and dry Bitter pattern technique. It is shown that the domain wall mergence and the wall-state transition during this incoherent magnetization rotation is closely related to Barkhauson jumps in the sensor, and also it is noted that the hooklike domain that appears at the link point of sensor and leads is involved in the irreversible transition.
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Weichun Ye, Dahua Qin, Yuanxing Li
原稿種別: Article
1996 年 20 巻 61 号 p.
61-65
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MR head is a device sensitive to temperature. The signal distortion related to mechanical contact between head and media is a special phenomenon to MR head. In this paper, a method which modifies the transfer function of data channel was investigated to eliminate the effect of thermal asperity of MR head in tape drive. The result shows that this method becomes a important, economic and effective way in addition to improving the MR head design.
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S. Tazaki, K. Hirai, Y. Yamada
原稿種別: Article
1996 年 20 巻 61 号 p.
67-74
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The two-dimension code is the newest robust recoding code. With much interest, is the 2D-PR4 (two-dimensional partial response class IV) code which is attractive in improving not only the recoding capacity and clocking ability, but also the required signal-to-noise ratio that is essential in obtaining the necessary bit error rate. This paper investigates and gives a comparison between this code and the QP code which is known as a powerful MSN code, and where both codes have the same code efficiency, 2/4.
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DerRay Huang, YarPin Lee, SiePoon Chang
原稿種別: Article
1996 年 20 巻 61 号 p.
75-79
発行日: 1996/11/21
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Magneto-Optical thin films with composition Tb-Fe-Co-Cr are coated on different substrates Al foil, Co-base and Fe-base amorphous ribbons. The thickness of M-O thin films is in the range from 200 nm to 1200 nm, which is sandwiched between two AIN layers with thickness 100 nm to prevent it from oxidation. The kerr loops of M-O films were measured with wavelength from 500 nm to 860 nm, and the peak applied field was 9KOe. The Kerr angles of M-O films deposited on Co-base and Fe-base amorphous ribbons are improved by a factor of 2.6 and 2.86 respectively at wavelength 780 nm. The Kerr angles of M-O films are enhanced by either Co-base amorphous ribbon or Fe-base amorphous ribbon markly. It can be considered as a magnetic image effect.
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HoonSang Oh, ByungIl Lee, SeungKi Joo
原稿種別: Article
1996 年 20 巻 61 号 p.
81-86
発行日: 1996/11/21
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Interface structures of Co/Pd and Co/Pt multilayers were modified by several different methods and the magnetic properties of these multilayers were investigated. It was found that the coercivity of Co/Pd multilayers could be enhanced to a great extent by increasing the sputtering pressure of Pd underlayer while Co/Pt films showed no significant increase of coercivity by sputtering pressure control of underlayer. Coercivity of Co/Pt films could be effectively increased by reducing the deposition rate of Pt sublayer, which was attributed to the enhanced pinning effect of domain wall motion. Argon ion bombardment to the multilayers turned out to decrease the coercivity as well as perpendicular magnetic anisotropy of both the multilayers.
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吉川 博, 田辺 隆也, 山本 学, Laurence BOUET
原稿種別: 本文
1996 年 20 巻 61 号 p.
87-93
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光磁気ディスクの高密度化を実現するには、熱記録されるマークエッジ形状の精密制御が重要である。本論文では、容量2.6GBを目指した130mm径光磁気媒体についてMFM(Magnetic force microscopy)技術を用いて記録マークの形状観察を行い、記録パワーの変動、熱的な干渉およびオーバライト記録時の消し残りがマーク形状の歪に及ぼす影響を明らかにした。またパルストレイン記録において、先頭の記録補償パルスのレベル制御、オーバライト媒体ではさらに消去パワーレベルの制御を行うことにより歪補正が可能であることを明らかにした。
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Chung Ping LIU, Der Ray HUANG, E Van LIAO, Yung Yuan CHANH, Don Yau CH ...
原稿種別: Article
1996 年 20 巻 61 号 p.
95-101
発行日: 1996/11/21
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In general, GeTeSb ternary alloy has been used as phase-change optical recording mrdium by using its differential reflectivity of crystalline phase or amorphous phase. In this experiment, GeTeSb film was deposited by using RF sputtering process. Thermal properties of GeTeSb film was measured with a differential sacnning calorimeter (DSC) under different heating rates. From DSC curves, the melting point of GeTeSb film is about 390℃ under different heating rates, while the crystallization temperature is varied under different heating rates. With heating rate increased from 10 ℃/min to 200 ℃/min, the crystakkization temperature is increased from 170 ℃ to 198 ℃. In real recording process of phase-change optical disk, the heating rate is much higher than 200 ℃/min. The three activation energy of crystalline phase respectively 1.86 eV, 1.93 eV, and 1.79 eV, can be obtained with Kissinger method. We can estimate the crystallization temperature in the recording process is around 230 ℃〜250 ℃ by numerical extrapolation method from DSC data. It is a useful method to predict the thermal properties of phase change recording medium. A detailed experimental data and analysis will be discussed.
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TzuanRen JENG, JiinSen CHEN, DonYau CHIANG, DerRay HUANG, WenYih LIAO, ...
原稿種別: Article
1996 年 20 巻 61 号 p.
103-107
発行日: 1996/11/21
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The upper dielectric layer of phase change disk affects markedly on recording characteristics. It is found that the threshold writing power decreases as the thickness of this layer increases. The erasibility is also related to the thickness of this layer. From the cycle test of erase and write, the disk structure in this article presented that the CNR value degrades about 1 dB when the cycle times increase one order of 10.
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原稿種別: 付録等
1996 年 20 巻 61 号 p.
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発行日: 1996/11/21
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