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原稿種別: 表紙
p. Cover1-
発行日: 1999/11/10
公開日: 2017/06/23
会議録・要旨集 フリーPDF形式でダウンロード (13K) -
原稿種別: 目次
p. Toc1-
発行日: 1999/11/10
公開日: 2017/06/23
会議録・要旨集 フリーPDF形式でダウンロード (94K) -
Zheng Hu, Yu Han, Yi Chen原稿種別: Article
セッションID: VIR99-90
発行日: 1999/11/10
公開日: 2017/06/23
会議録・要旨集 フリーA new type of preparation method has been developed to produce nanoscale amorphous alloys. Iron-boron amorphous alloy particles thus obtained have boron contents far beyond the eutectic limitation of the binary system, and particle sizes around 10 nm corresponding to surface areas about 62 m^2/g. The unique properties of the products, which are not obtainable by any other preparation methods, and the applicability of the new method for mass-production suggest that this approach may provide a new class of nanoscale amorphous materials for various applications. Mossbauer spectroscopy and transmission electron microscopy were used to clarify the process of sample preparation.抄録全体を表示PDF形式でダウンロード (353K) -
S. Wang, P.S. Lee, J. Ding, G.M. Chow原稿種別: Article
セッションID: VIR99-91
発行日: 1999/11/10
公開日: 2017/06/23
会議録・要旨集 フリーNickel thin films were deposited onto (100) silicon wafers using the sputtering technique. The thickness was varied between 45 to 500 nm. The nickel film formed in the initial stage (45 nm) was an uniform and continuous layer on the silicon substrate coated with a native silicon oxide layer. The film with a thickness of 78 nm exhibited high coercivity H_c (806 Oe) and high squareness in the perpendicular direction to the film plane, while H_c of 349 Oe was measured in the film plane. As the thickness increased, coercivity and magnetic anisotropy reduced and a plane anisotropy was finally exhibited in thick films (〜500 nm). TEM study showed that the films were mixtures of a columnar structure on the top and a uniform continuous structure on the bottom. All the films have shown a (111) texture and the grain size was estimated to be 15-20 nm.抄録全体を表示PDF形式でダウンロード (730K) -
Daishun Zheng, Xiaohong Li, Tian Xie, Dongping Wu, Fulin Wei, Zheng Ya ...原稿種別: Article
セッションID: VIR99-90
発行日: 1999/11/10
公開日: 2017/06/23
会議録・要旨集 フリーFe-Ta-N films and Fe-Al-N films with different composition were prepared by RF reactive sputtering technique, using composite targets with Ar+N_2 mixed gases. The influences of Ta and Al content, sputtering partial nitrogen pressure P(N_2) and annealing temperature T_A on structure and magnetic properties of films were investigated. It is found that the addition of Ta and Al efficiently inhibits the formation of γ-Fe_4N phase in the films. A comparison of influences of additional Ta and Al elements on structure and soft magnetic properties of Fe-N based films was made and the mechanism is discussed in this paper.抄録全体を表示PDF形式でダウンロード (445K) -
M. Lu, M. Matsumoto, F.L. Wei, Z.D. Hu, Z. Yang原稿種別: Article
セッションID: VIR99-93
発行日: 1999/11/10
公開日: 2017/06/23
会議録・要旨集 フリーThe single domain size of ferromagnetic cubic particles are invesgated by micromagntics simulation. The angular dependence of coercive forces and the angular dependence of hysteresis loops for particles of sizes 250Å, 350Å, 450Å, 500Å, 520Å, 530Å and 550Å are calculated and discussed. For a particle of size smaller than 450Å, it switches mostly in the coherent rotation, for a particle of size 500Å, its magnetization reversal resembles the incoherent fanning, while for a particle of size larger than 520Å, its magnetization reversal is due to the wall motion. The single domain size for cubic particle is about 510Å.抄録全体を表示PDF形式でダウンロード (392K) -
Dan Wei, C.K. Ong原稿種別: Article
セッションID: VIR99-94
発行日: 1999/11/10
公開日: 2017/06/23
会議録・要旨集 フリーMedium noise is the dominant noise in ultra-high density disk recording systems. The peak, width and jitter noise are analyzed by micromagnetic simulation. Four different media, with a fixed grain size of 135Å and a coercivity of 2900 Oe, are chosen for medium noise analysis. The linear recording density is increased from 340 KFCI to 750 KFCI, while the area recording density is from 14.3 Gb/in^2 to 31.5 Gb/in^2. The peak-amplitude noise is studied by analyzing the distribution of the peak magnetization M_p in each bit. The distribution of M_p develops from a delta-function around the remanence M_γ at low densities to a flat distribution at extremely high densities. It is found that the transition a-parameter is no longer proportional to the square root of M_γδ, as given in the William-Comstock approximation. The peak jitter noise in the read back voltage is studied by the percentage of the transition jitter in a bit length.抄録全体を表示PDF形式でダウンロード (957K) -
Weichun Ye, Bin Liu, Yu Lin原稿種別: Article
セッションID: VIR99-95
発行日: 1999/11/10
公開日: 2017/06/23
会議録・要旨集 フリーAs the track becomes narrower, the effects of track edge become more significant. These effects, such as the amplitude reduction, variations in the shape of the isolated pulse, the partial erasure and the amplitude asymmetry, are dependent on head/disk combination and the off-track position. These relationships are discussed in detail in this paper. More importantly, an off-track model is proposed to study the off-track BER performance for the head with narrow track width. The BER performances of EPRML channel for different off-track cases and different head/media combinations are studied based on this model. Simulation results have proved that this model is a useful tool for simulation of system performance.抄録全体を表示PDF形式でダウンロード (471K) -
宮下 英一, 久我 淳, 田口 亮, 玉城 孝彦, 奥田 治雄原稿種別: 本文
セッションID: VIR99-96
発行日: 1999/11/10
公開日: 2017/06/23
会議録・要旨集 フリーTbFeCoなどの非晶質連続媒体は、グレイン構造を持たないため非常に低ノイズであることが知られており、非晶質媒体の磁気記録用の媒体への適用は、大変興味深い。我々は、非晶質媒体の磁気記録特性を、LLG方程式を使った計算機シミュレーションにより確かめた。その結果、非晶質媒体は磁化遷移がシャープで波形ひずみが小さいこと、500Gbit/inch^2以上の高記録密度で明瞭な記録ビットを残せることがわかり、超高密度記録への可能性が示された。抄録全体を表示PDF形式でダウンロード (772K) -
Lianjun Wu, Naoki Honda, Kazuhiro Ouchi原稿種別: Article
セッションID: VIR99-97
発行日: 1999/11/10
公開日: 2017/06/23
会議録・要旨集 フリーA Co/Pd multilayer film with a perpendicular coercivity of 2.2 kOe and SQ of unity was prepared by electron beam evaporation in vacuum. In the MFM image for signal patterns of 4 kFRPI recorded using a ring type MIG head, many reversed domains were observed. However, when the film was magnetized along the film normal using an electromagnet(H=13 kOe), few reversed magnetic domains were observed, which was consistent with SQ=1. Therefore, the reversed domains in the signal patterns occurred in recording process. The dc erasing was also studied with the magnetic field inclined to the film normal. The domain structures were almost the same when the perpendicular components of the field were kept constant while the in-plane components were varied, implying that the in-plane field component did not contribute to the formation of the reversed domains. Reversed magnetic domains were easily induced even when a weak reversing magnetic field was applied along the film normal. Hence, the reversed magnetic domains in the signal patterns were considered to be caused by some erasing effect of the ring type MIG head. A large negative nucleation field in the perpendicular M-H loop is effective to suppress the reversed magnetic domains.抄録全体を表示PDF形式でダウンロード (2258K) -
黒澤 孝裕, 本多 直樹, 大内 一弘原稿種別: 本文
セッションID: VIR99-98
発行日: 1999/11/10
公開日: 2017/06/23
会議録・要旨集 フリー記録ヘッドとして100μm幅のMIGヘッド, 再生ヘッドとして2.7μm幅のMRヘッドを用いて, 再生波形のベースラインシフトを測定した。ベースラインシフトはトラック端で極大になり, 極端部では負の値を取った。トラック端での漏洩磁界とMRヘッドの再生出力のオフトラック特性を元に漏洩磁界がベースラインシフトに与える影響を検討した。漏洩磁界から生じる再生出力と観測されたベースラインシフトのオフトラック特性とは定性的に一致した。また長手軸方向におけるMRヘッドの垂直感度関数を求めた。この感度関数は単峰型ピークを含み, このピークがトラック端での漏洩磁界を拾うことによってベースラインシフトが生じると考えられる。抄録全体を表示PDF形式でダウンロード (530K) -
内田 勝, 本多 直樹, 大内 一弘原稿種別: 本文
セッションID: VIR99-99
発行日: 1999/11/10
公開日: 2017/06/23
会議録・要旨集 フリー垂直方向のM-Hループの傾きが小さい単層膜垂直磁気記録媒体は低ノイズ特性を示すが, 高い記録特性を得るためには急峻なヘッド磁界を必要とする.媒体記録層の膜厚を減じることにより急峻なヘッド磁界分布による記録が期待される.したがって, 記録再生特性における膜厚効果の検討をCo/Pd人工格子膜媒体について行った.規格化した信号レベルは膜厚減少とともに増加するが, それはループ傾きの小さな媒体に対する記録, また, より高密度での記録において顕著であった。薄層化した媒体では急峻なヘッド磁界分布を使うことができ, ダイパルス幅をより小さくすることができる.しかし今回検討を行った媒体の記録分解能は, 磁区の構造およびサイズによるところが大きい.抄録全体を表示PDF形式でダウンロード (895K) -
Bo Liu, Sheng-Bin Hu, Wei Zhang原稿種別: Article
セッションID: VIR99-100
発行日: 1999/11/10
公開日: 2017/06/23
会議録・要旨集 フリーAs technology moves towards 100 Gb/in^2 areal densities and channel density above 3, the homogeneity of media's recording capability becomes a crucial issue in defining the reliability of the recording systems. Two concepts are proposed in this work for performance analysis : recording performance roughness analysis and dynamic magnetic roughness analysis. The recording performance roughness analysis is based on an in-situ measurement technique of the non-linear transition shift(NLTS). Relationship between the performance roughness and the roughness of dynamic magnetic parameters are studied. Results of experimental investigations indicate that the NLTS based performance roughness analysis can reveal more details on media's recording capability and the capability fluctuation. The work also extend to the accuracy analysis of the playback amplitude based methods for the analysis of the dynamic coercive squareness and dynamic hysteresis loop.抄録全体を表示PDF形式でダウンロード (1002K) -
Mui Chong Chai, Samuel Gan, Li Hong Zhang, Djohni Chandra, Quock Ng原稿種別: Article
セッションID: VIR99-101
発行日: 1999/11/10
公開日: 2017/06/23
会議録・要旨集 フリーA measure of head disk interface reliability is a better control of the nature and frequency of head disk contact. Intuitively, one strives to minimize the number and severity of those contacts in order to achieve maximal reliability. One approach to assess the relative goodness of a head/disk interface is by comparing the 'contact energy", determined by the area under the CSS friction profile, of that interface. Another approach is a detailed characterization of the contacts for those interfaces, by time frequency analysis. This paper discusses these approaches and our laboratory findings. Contact Energy will be derived and its relationship to durability, as may be determined from css testing, will be discussed. Characterization of the nature of head/disk contacts, and their possible effects, for different head/disk pairs, will be explored.抄録全体を表示PDF形式でダウンロード (1649K) -
Li Hong Zhang, Mui Chong Chai, Samuel Gan, Djohni Chandra, Quock Ng原稿種別: Article
セッションID: VIR99-102
発行日: 1999/11/10
公開日: 2017/06/23
会議録・要旨集 フリーHead disk reliability consists of at least of the following : durability, friction/stiction, and chemical integrity. Component and/or drive based css testing has been often used as the sole evaluation tool for all the reliability concerns. We have resurrected the use of the drag test as a quick and simple evaluation tool for head disk durability. This approach seems appropriate in light of the fact that protective coating and lubricant film thick nesses are both decreasing in order to accommodate for the increase in areal density. In an attempt to keep the HDI closely resembling the product HDI the same slider and disk pairs are used at below take-off velocities. We will discuss our findings relative to the conventional css tests, as well as other un-anticipated findings. Our findings will show that drag testing can have predictive as well as diagnostic capabilities.抄録全体を表示PDF形式でダウンロード (392K) -
Jiwen Wang, Bo Liu, Zhi-min Yuan, Jun Ding原稿種別: Article
セッションID: VIR99-103
発行日: 1999/11/10
公開日: 2017/06/23
会議録・要旨集 フリーSlider-disk impact at high velocity may induce high flash temperature due to frictional heating. The maximum values of flash temperature depend on the impact area, the material properties and the operating conditions, and it can range from below 100℃(normal condition)to more than 1000℃(extreme condition). By the effect of thermal expansion among the layers of disk, the stress induced by flash temperature in the magnetic layer are calculated based on different disk substrates. From the inverse magnetostriction effect, its influence on the magnetic degradation has been investigated via micro-magnetic simulation. The results show that magnetic degradation could occur far below Curie temperature.抄録全体を表示PDF形式でダウンロード (456K) -
Hyeong-Jun Kim, Kwon-Ku Cho, Seung-Ki Joo原稿種別: Article
セッションID: VIR99-104
発行日: 1999/11/10
公開日: 2017/06/23
会議録・要旨集 フリーNiFe(60Å)/Co(5Å)/Cu(60Å)/Co(30Å) pseudo spin valve (PSV) thin films were prepared on Cu(50Å)/Si(111, 4 degree tilt-cut) templates by a RF magnetron sputtering system and patterned into micron sized magnetoresistive random access memory (MRAM) cells using conventional optical lithographic processes. When the switching properties of PSV MRAM cells were investigated with respect to the cell geometry, the cells showed a few mV of output voltrage in constant 1 mA of sense current and much sensitive variation of switching thresholds of both soft and hard layers consisting of the cells. In order to reduce the switching thresholds of magnetic layers in micro cells, which is an obstacle of realization of a competitive MRAM device, a new approach has been introduced using the control of shape anisotropy of the cells. By an appropriate combination of two anisotropy terms, shape anisotropy of the cells and magnetocrystalline uniaxial anisotropy of sheet films, the switching threshold of NiFe(60Å)/Co(5Å) soft layer could be decreased from about 15 Oe to 5 Oe and the concept has been thought to be useful for a practical PSV MRAM device.抄録全体を表示PDF形式でダウンロード (433K) -
Won-Cheol Jeong, Kwon-Ku Cho, Seung-Ki Joo原稿種別: Article
セッションID: VIR99-105
発行日: 1999/11/10
公開日: 2017/06/23
会議録・要旨集 フリーSpin valves exchange biased by a Co/Ru/Co [Ru/Co/Cu/Co/Ru/Co/Cu/Si Substrate] were fabricated on 4 degree tilt-cut Si (111) substrate by RF magnetron sputtering method. When a Cu (50Å) underlayer was deposited prior to the formation of the spin valves, Co/Ru/Co and Co layers constituting spin valves have been developed uniaxial magnetic anisotropy in the direction of Si <112>. In case of a Co/Ru/Co with the same thickness of Co[synthetic antiferromagnet], spin valves with a 25 Å Cu spacer have showed giant-magnetoresistance ratio above 5% until the external magnetic field overcame the crystal anisotropy field originated from tilt-cut Si substrate. When arrived at critical field, Co/Ru/Co has displayed spin flopping phenomena as in the antiferromagnetic material. In making the thickness of Co in a Co/Ru/Co different[synthetic ferrimagnet], above spin flopping phenomena have disappeared. Instead, thinner Co layer has first reversed its magnetization and keeped the antiparallel state with the thicker Co layer.抄録全体を表示PDF形式でダウンロード (476K) -
Yong-Jin Cho, Kwon-Koo Cho, Seung-Ki Joo原稿種別: Article
セッションID: VIR99-106
発行日: 1999/11/10
公開日: 2017/06/23
会議録・要旨集 フリーIn this paper, spin-dependent tunneling junctions, in which the tunneling barrier Al_2O_3 is formed by depositing a 1〜3nm thick Al layer, followed by thermal exidation at room temperature in an O_2 atmosphere, were fabricated on 4° tilt (111)Si substrate in 3-gun magnetron sputtering system. The top and bottom ferromagnetic electrodes were Ni_<80>Fe_<20> and Co. A maximum Tunneling MR ratio of 14% was obtained in the junction of which insulating barrier thickness was 2nm. By increasing the tunneling voltage across the junction, maximum MR ratio reduced and finally showed no MR characteristics.抄録全体を表示PDF形式でダウンロード (429K) -
Dong-Hwan Ahn, Kwon-Ku Cho, Seung-Ki Joo原稿種別: Article
セッションID: VIR99-107
発行日: 1999/11/10
公開日: 2017/06/23
会議録・要旨集 フリーThe exchange coupling of NiMn/Co and Co/NiMn bilayers has been investigated. Stacking sequence of NiMn and Co was changed and the effect of Ta underlayer on exchange coupling was examined. NiMn top-structured sample showed higher exchange coupling field and it was found that Ta underlayer had better not be used in order to obtain higher exchange coupling, which is unlike NiFe/NiMn bilayers. Also, as a function of the thickness of Co and NiMn layers, magnetic properties of Co/NiMn bilayers have been investigated and explored抄録全体を表示PDF形式でダウンロード (298K) -
原稿種別: 付録等
p. App1-
発行日: 1999/11/10
公開日: 2017/06/23
会議録・要旨集 フリーPDF形式でダウンロード (75K)
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