• Title/Summary/Keyword: storage materials

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Thermo-Piezoelectric Read/Write Mechanisms for Probe-Based Data Storage

  • Nam, Hyo-Jin;Kim, Young-Sik;Lee, Sun-Yong;Jin, Won-Hyeog;Jang, Seong-Soo;Cho, Il-Joo;Bu, Jong-Uk
    • Transactions of the Society of Information Storage Systems
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    • v.3 no.1
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    • pp.47-53
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    • 2007

  • In this paper, a thermo-piezoelectric mechanism with integrated heaters and piezoelectric sensors has been studied for low power probe-based data storage. Silicon nitride cantilever integrated with silicon heater and piezoelectric sensor has been developed to improve the uniformity of cantilevers. Data bits of 40 nm in diameter were recorded on PMMA film. The sensitivity of the piezoelectric sensor was 0.615 fC/nm after poling the PZT layer. And, the $34\times34$ probe array integrated with CMOS circuits has been successfully developed by simple one-step bonding process. The process can simplify the process step and reduce tip wear using silicon nitride tip.

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Evaluations of Microstructure and Hydrogenation Properties on $Mg_2NiH_x$ ($Mg_2NiH_x$ 수소저장합금의 미세결정구조 및 수소화 특성평가)

  • Seok, Song;Shin, Kyung;Kweon, Soon-Yong;Ur, Soon-Chul;Lee, Young-Geun;Hong, Tae-Whan
    • Journal of Hydrogen and New Energy
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    • v.16 no.3
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    • pp.238-243
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    • 2005

  • Mg and Mg-based alloys are most important hydrogen storage materials. It is a lightweight and low-cost materials with high hydrogen storage capacity. However, the formation of hydride at high temperature, the deterioration effect, the hydriding and dehydriding kinetics are bad factor for application. In this study, Mg and Ni have been produced by hydrogen induced mechanical alloying(HIMA) process. The raw materials, Mg(purity 99.9%) chip and Ni(purity 99.95%) chip was prepared by using a planetary ball mill apparatus(FRITSCH pulverisette 5). The balls to chips mass ratio(BCR) are 30:1. The hydrogen pressure induced 2.0MPa and milling times were 12, 24, 48, 72, 96 hours with a rotating speed of 200rpm. X-ray diffraction(XRD) analysis was made to characterize the crystallite size and misfit strain. The crystallite size measured by laser particle size analysis(PSA). Microstructure changes were investigated by scanning electron microscopy(SEM) and the transmission electron microscopy(TEM). The hydrogen storage properties were evaluated by using an Sivert's type automatic pressure-composition-therm(PCT) apparatus.

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