共查询到20条相似文献,搜索用时 429 毫秒
1.
In Part I of this paper we described a computer model for the simulation of magnetic recording and applied this model to the simulation of digital recording. The second part covers the application of the model to the remaining two major techniques of magnetic recording: Analog audio and analog video recording. Theoretically determined correlations between hardware and medium parameters and the recording properties of the recording systems are discussed and compared with experimental data. It is shown that the model describes even such complex techniques as the overwrite recording in HiFi-VHS video recording to a quantitative degree. 相似文献
2.
3.
AgInSbTe薄膜的短波长记录性能分析 总被引:1,自引:0,他引:1
采用自制的装置研究了Ag5In5Sb47Te33薄膜的静态记录性能与记录激光的功率和脉冲宽度的关系,并对其记录畴形貌特点进行了直接观察。结果表明只有记录激光的功率和脉冲宽度在一定范围之内才能起到信息记录的作用,所得的记录畴形貌十分清晰,基本为非晶态Ag5In5Sb47Te33;小于该范围的激光能量不能使材料结构发生较大的变化,所得的记录畴形貌模糊,反射率对比度低于2%;大于该范围所得的记录畴由烧蚀区和其周围的非晶态Ag5In5Sb47Te33组成。另外,得到了记录激光功率为12mW、脉冲宽度为90ns的Ag5In5Sb47Te33薄膜的短波长最佳记录条件,其记录畴的反射率对比度为22%,直径为380nm-400nm。 相似文献
4.
Gains in storage density in magnetic recording have fundamentally been achieved by scaling—reduced geometrical dimensions under the assumption that the recording physics does not change if all dimensions are scaled appropriately. It is becoming clear that evidence of the breakdown of scaling is now seen. We will here discuss ways to break the constraints on magnetic recording set by scaling. In particular, we will discuss energy-assisted recording, domain-wall-assisted recording, and bit-patterned media, with some emphasis on recording system considerations. 相似文献
5.
Shaoping Li Hector MendezDave Terrill Feng LiuDaniel Bai Sining Mao 《Journal of magnetism and magnetic materials》2012,324(3):252-259
A systematic experimental study of the reverse overwrite (ReOVW) process in the shingled recording scheme has been conducted in conjunction with characterization of corresponding recording performances from recording heads with different geometries. It was found that there is no ReOVW reduction as the track density increases in a strict shingled recording fashion. Nonetheless, ReOVW is indeed slightly decreased from 300 to 700 kpi in a so-called one write shingled recording process. Overall our obtained data suggest that conventional magnetic recording technology might be able to extend all the way beyond an areal density of one Tbit/in2 by using the shingled recording scheme. 相似文献
6.
对描述双掺杂晶体非挥发性全息记录动力学过程的Kukhtarev方程进行了矢量分析,分析中考虑了体光生伏特效应和外加电场的作用。在小信号近似的基础上给出了双中心全息记录中记录与固定阶段空间电荷场的矢量解析解。在综合考虑空间电荷场的各向异性以及晶体有效电光系数的各向异性后,给出了双中心全息记录的优化记录方向。结果表明,对(Fe,Mn)∶LiNbO3晶体633nm寻常光记录,优化记录方向主要由有效电光系数决定,光栅波矢与光轴夹角为22°,方位角为30°;对(Fe,Mn)∶LiNbO3晶体633nm非寻常光记录,优化记录方向主要由固定空间电荷场决定,光栅波矢与光轴夹角为44°,方位角为90°。 相似文献
7.
8.
We designed a rapid functional imager for the parallel recording of localized intrinsic optical signals (IOSs). This imager used a microlens array (MLA)-based illuminator to deliver visible stimulus light and near-infrared (NIR) recording light simultaneously. The parfocal configuration of the stimulus and recording light illumination enabled confocal recording of the stimulus-evoked IOSs. Because the MLA stimulation/recording spots were widely separated on the retina, and only the photoreceptors within the MLA stimulation/recording spots were stimulated, the potential IOS cross talk effect among neighboring retinal areas was minimized. Our experiments revealed robust IOS activities tightly correlated with localized retinal responses. 相似文献
9.
Shun-ichi Iwasaki 《Journal of magnetism and magnetic materials》2012,324(3):244-247
Development of perpendicular magnetic recording is summarized along with learning from the research study. The early stage of perpendicular recording was conducted with the research philosophy of complementarity between perpendicular and horizontal recordings. Although present production of the perpendicular recording HDDs exceeds 600 million per year, development of perpendicular recording experienced the valley of death in the 1990s. The difficult period was overcome by the collaboration system of industrial and academic communities. The research on perpendicular recording brought about development of new research model as well as the historical view of the development of technology and innovation. The huge influence of perpendicular recording on society also taught us the relationship between science and technology with culture and civilization. 相似文献
10.
Nonvolatile two-color holographic recording gated by incoherent ultraviolet (UV) light centered at 365 nm is investigated in near-stoichiometric lithium niobate crystals. The influence of thermal treatment on the two-color recording is studied. The results show that thermal reduction tends to improve the two-color recording performance, whereas thermal oxidation degrades the two-color recording. With an incoherent 0.2-W/cm2 UV gating light and a 0.25-W/cm2 semiconductor recording laser at 780 nm, a two-color recording sensitivity of 4 × 10^-3 cm/J and a recording dynamic range characterized by M/# of 0.12 are achieved in a 2.2-mm thermally reduced near-stoichiometric lithium niobate crystal. We attribute the improvement to the prolonged lifetime of small polarons and the increased absorption at the gating wavelength due to thermal reduction. 相似文献
11.
12.
13.
Youwen Liu Liren Liu De'an Liu Liangying Xu Changhe Zhou 《Optics Communications》2001,190(1-6):339-343
Nonvolatile photorefractive gratings have been recorded in LiNbO3:Cu:Ce crystals by using a He–Ne laser (633 nm) for recording and an argon ion laser (458 nm) for sensitizing. The sensitizing light increases the recording sensitivity by a−bexp(−Is/c) and saturation behavior will appear with high enough intensity of sensitizing light. The recording light increases the slope of η1/2 as a function of time during the initial stages of hologram formation by sublinear Ixr (x<1) and thus the recording light decreases the recording sensitivity. The dependence of saturation diffraction efficiency on the intensities of the recording and sensitizing light shows that there is a maximum dynamic range of the recording process. 相似文献
14.
15.
A. M. Lyalikov 《Optics and Spectroscopy》2006,100(3):463-466
Some specific features of recording holograms with rotation of a recording medium between exposures are considered. It is shown that the rotation of the recording medium makes it possible to exclude completely the effect of aberrations of the recording/rerecording system in the formation of interference patterns characterizing the phase change by an object under study during the time interval between the instants at which the corresponding holograms are recorded. 相似文献
16.
The anisotropic Bragg diffraction of the volume holographic gratings in photorefractive crystals are investigated based on the model of anisotropic coupled-wave theory. The effect of the initial intensity ratio and the recording angles of the two recording waves on the anisotropic Bragg diffraction properties is discussed. It is shown that both the ratio of the initial intensity and the incident angles of the recording waves are selective action for the anisotropic Bragg diffraction efficiency of the volume holographic gratings, while these two recording conditions are not selective action for the isotropic Bragg diffraction. Furthermore, the Bragg phase matching condition of anisotropic diffraction is analyzed when the recording angles change. 相似文献
17.
The photorefractive sensitivity and the effective electron transport length in two-centre holographic recording 下载免费PDF全文
In this paper the photorefractive sensitivity defined for single-centre holographic
recording is modified to adapt two-centre holographic recording. Based on the time
analytic solution of Kukhtarev equations for doubly doped crystals, the analytical
expression of photorefractive sensitivity is given. For comparison with
single-centre holographic recording and summing the electron competition effects
between the deeper and shallower traps, an effective electron transport length is
proposed, which varies with the intensity ratios of recording light to sensitive
light. According to analyses in this paper, the lower photorefractive sensitivity
in two-centre holographic recording is mainly due to the lower concentration of
unionized dopants in the shallower centre and the lower effective electron
transport length. 相似文献
18.
Daiichi Koide Takeshi Kajiyama Ryuji Sato Haruki Tokumaru Yoshimichi Takano 《Optical Review》2014,21(5):541-544
We report on the recording characteristics of a near-field optical recording thin optical disk (NFR-TOD). We proposed a new cooling-less-type write strategy for recording, applied it to the NFR-TOD experimental system, and also applied a partial response maximum likelihood (PRML) signal processing, which was evaluated and optimized the PR coefficient for playback signals of the prototype NFR-TOD. The NFR-TOD has a track pitch of 160 nm and improved recording characteristics. The experimental results of the prototype NFR-TOD and the system indicate sufficiently low bit error rates (bERs) for recorded data at a fourfold higher recording density than the current Blu-ray disk. 相似文献
19.
20.
具有光致变色效应的菌紫质薄膜可用作可擦重写型全息记录介质. 在全息记录过程中,由于菌紫质薄膜对记录光的散射和反射引起记录光栅对比度下降,当记录光较弱时,这种影响较小,可以忽略;但当记录光较强时,散射和反射光对记录光栅的影响很大,必须考虑它们对光栅对比度的影响才能对实验结果进行合理的解释. 实验发现在不同的记录光强下辅助紫光对衍射效率动力学曲线的影响不同,当记录光强较弱时,加入辅助紫光可以提高衍射效率的稳定值、抑制峰值;而当记录光强较强时,加入辅助紫光除了提高衍射效率的稳定值外,还可以提高衍射效率的峰值.
关键词:
菌紫质
衍射效率
干涉条纹对比度 相似文献