TEMPLATED SYNTHESIS OF NANOSTRUCTURED COBALT THIN FILM FOR POTENTIAL TERABIT MAGNETIC RECORDING

NANO ◽  
2006 ◽  
Vol 01 (01) ◽  
pp. 41-45 ◽  
Author(s):  
U-HWANG LEE ◽  
JONG BAE PARK ◽  
SEONG KYU KIM ◽  
YOUNG-UK KWON
Keyword(s):  
Thin Film ◽  
Memory Device ◽  
Magnetic Memory ◽  
Templated Synthesis ◽  
Wafer Substrate ◽  
Silica Thin Film ◽  
Cobalt Thin Film ◽  
Fcc Structure ◽  
Very High ◽  
Si Wafer

An array of cobalt nanorods of 10 nm in diameter and 14 nm of rod-to-rod distance was fabricated by electrochemical deposition technique into the pores of a mesoporous silica thin film formed on a Pt -coated Si wafer substrate. The cobalt nanorods are highly crystalline with the fcc structure. The magnetic hysterisis data at 300 K show that Co @silica nanocomposite film has strong magnetization anisotropy. Atomic and magnetic force microscopic data on this film revealed the possibility that each cobalt nanorod in the array can be individually magnetized. The number density of the cobalt nanorods is very high with 6 × 1012 per in2, high enough to develop into a terabit magnetic memory device.

Dewetting Suppression of Polystyrene Thin Film Using Titanium Dioxide Nanoparticles

2014 ◽  
Vol 608 ◽  
pp. 218-223 ◽  
Author(s):  
Nampueng Pangpaiboon ◽  
Nisanart Traiphol
Keyword(s):  
Thin Film ◽  
Titanium Dioxide ◽  
Titanium Dioxide Nanoparticles ◽  
Force Microscopy ◽  
Spin Casting ◽  
Polymeric Thin Film ◽  
Atomic Force ◽  
Base Polymer ◽  
Wafer Substrate ◽  
Si Wafer

Effects of titanium dioxide nanoparticles on thermal stability of polymeric thin film are investigated in this study. Polystyrene with molecular weight of 52,000 g/mol is used as a base polymer. The concentrations of titanium dioxide nanoparticles in polystyrene are varied from 0-0.20 wt.%. Films are fabricated by spin casting on Si wafer substrate and annealed at 180 °C and 190 °C for various times in order to study dynamics of dewetting. Film morphologies are analysed by optical microscopy and atomic force microscopy. Dewetting areas of each film as a function of annealing time are determined. It is found that addition of titanium dioxide nanoparticles suppresses dewetting in polystyrene film with thicknesses of ~30 nm and ~100 nm. The same titanium dioxide amounts, on the other hand, accelerate dewetting process in the film with thickness of ~265 nm. Mechanisms of dewetting suppression in polymeric film by titanium dioxide nanoparticles are discussed.

scholarly journals Measurement of Intrinsic Hardness of Deposited Chromium Thin Films by Nanoindentation Method and Influencing Factors

2020 ◽  
Vol 58 (3) ◽  
pp. 207-215
Author(s):  
Young-Joon Kang ◽  
Ju-Hwan Baeg ◽  
Hyun Park ◽  
Young-Rae Cho
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Indentation Depth ◽  
Physical And Mechanical Properties ◽  
Functional Materials ◽  
Influential Factors ◽  
Force Microscopy ◽  
Atomic Force ◽  
Wafer Substrate ◽  
Si Wafer

Materials with very small dimensions exhibit different physical and mechanical properties compared to their bulk counterparts. This becomes significantly important for the thin films that are widely used as components in micro-electronics and functional materials. In this study, a chromium (Cr) thin film was deposited on a silicon (Si) wafer by DC-magnetron sputtering. The intrinsic hardness of the Cr thin film on Si-wafer was evaluated by the nanoindentation method. We especially investigated ways of measuring the intrinsic hardness of the Cr thin film, and influential factors including the substrate effect and surface roughness effect. To further characterize the intrinsic hardness of the Cr thin film on Si-wafer, we used Xray diffraction (XRD), scanning electron microscopy (SEM), and atomic force microscopy (AFM). Two additional methods, the Meyer-plot and a profile for hardness versus indentation depth, were also employed. As a result of these two methods, we found that the profile for hardness versus indentation depth was valuable for evaluating the intrinsic hardness of Cr thin film on a Si-wafer substrate. The measured intrinsic hardness of the Cr thin film and Si wafer were about 900 Hv and 1143 Hv, respectively. The profile for hardness versus indentation depth can be widely used to evaluate the intrinsic hardness of metallic thin films on substrates.

Tunable Quantum Confinement Effect on Non-volatile Thin Film Polymer Memory Device

2008 ◽  
Author(s):  
Augustin J. Hong ◽  
Kang L. Wang ◽  
Wei Lek Kwan ◽  
Yang Yang ◽  
Dayanara Parra ◽  
...  
Keyword(s):  
Thin Film ◽  
Quantum Confinement ◽  
Quantum Confinement Effect ◽  
Memory Device ◽  
Confinement Effect ◽  
Film Polymer ◽  
Polymer Memory

Palladium Nanowire Thin Films via Template Growth

2003 ◽  
Vol 775 ◽  
Author(s):  
Donghai Wang ◽  
David T. Johnson ◽  
Byron F. McCaughey ◽  
J. Eric Hampsey ◽  
Jibao He ◽  
...  
Keyword(s):  
Thin Film ◽  
Electron Microscopy ◽  
Thin Films ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Conductive Substrate ◽  
Palladium Nanowires ◽  
Efficient Route ◽  
Silica Thin Film

AbstractPalladium nanowires have been electrodeposited into mesoporous silica thin film templates. Palladium continually grows and fills silica mesopores starting from a bottom conductive substrate, providing a ready and efficient route to fabricate a macroscopic palladium nanowire thin films for potentially use in fuel cells, electrodes, sensors, and other applications. X-ray diffraction (XRD) and transmission electron microscopy (TEM) indicate it is possible to create different nanowire morphology such as bundles and swirling mesostructure based on the template pore structure.

Designing a mesoporous hybrid organo-silica thin film prepared from an organic catalyst

2021 ◽  
Vol 2021 (2) ◽  
pp. 5-8
Author(s):  
Anna Sumardi ◽  
Muthia Elma ◽  
Erdina Lulu Atika Rampun ◽  
Aptar Eka Lestari ◽  
Zaini Lambri Assyaifi ◽  
...  
Keyword(s):  
Thin Film ◽  
Silica Thin Film ◽  
Organic Catalyst

An all-organic "soft" thin film transistor with very high carrier mobility

1990 ◽  
Vol 2 (12) ◽  
pp. 592-594 ◽  
Author(s):  
Francis Garnier ◽  
Gilles Horowitz ◽  
Xuezhou Peng ◽  
Denis Fichou
Keyword(s):  
Thin Film ◽  
Carrier Mobility ◽  
Thin Film Transistor ◽  
High Carrier Mobility ◽  
High Carrier ◽  
Soft Thin Film ◽  
Very High

Nanoengineered electrochemical sensor based on mesoporous silica thin-film functionalized with thiol-terminated monolayer

The Analyst ◽  
2003 ◽  
Vol 128 (7) ◽  
pp. 899 ◽  
Author(s):  
Wassana Yantasee ◽  
Yuehe Lin ◽  
Xiaohong Li ◽  
Glen E. Fryxell ◽  
Thomas S. Zemanian ◽  
...  
Keyword(s):  
Thin Film ◽  
Mesoporous Silica ◽  
Electrochemical Sensor ◽  
Silica Thin Film ◽  
Mesoporous Silica Thin Film

scholarly journals Lithium incorporation into a silica thin film: Scanning tunneling microscopy and density functional theory

2009 ◽  
Vol 80 (24) ◽  
Author(s):  
Jan Frederik Jerratsch ◽  
Niklas Nilius ◽  
Hans-Joachim Freund ◽  
Umberto Martinez ◽  
Livia Giordano ◽  
...  
Keyword(s):  
Thin Film ◽  
Density Functional Theory ◽  
Scanning Tunneling Microscopy ◽  
Density Functional ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Functional Theory ◽  
Silica Thin Film ◽  
Lithium Incorporation

scholarly journals Potential high-Tc superconducting lanthanum and yttrium hydrides at high pressure

2017 ◽  
Vol 114 (27) ◽  
pp. 6990-6995 ◽  
Author(s):  
Hanyu Liu ◽  
Ivan I. Naumov ◽  
Roald Hoffmann ◽  
N. W. Ashcroft ◽  
Russell J. Hemley
Keyword(s):  
Group Structure ◽  
High Temperature Superconductors ◽  
Face Centered Cubic ◽  
Superconducting Transition ◽  
High Tc ◽  
Structure Search ◽  
Systematic Structure ◽  
Face Centered ◽  
Fcc Structure ◽  
Very High

A systematic structure search in the La–H and Y–H systems under pressure reveals some hydrogen-rich structures with intriguing electronic properties. For example, LaH10 is found to adopt a sodalite-like face-centered cubic (fcc) structure, stable above 200 GPa, and LaH8 a C2/m space group structure. Phonon calculations indicate both are dynamically stable; electron phonon calculations coupled to Bardeen–Cooper–Schrieffer (BCS) arguments indicate they might be high-Tc superconductors. In particular, the superconducting transition temperature Tc calculated for LaH10 is 274–286 K at 210 GPa. Similar calculations for the Y–H system predict stability of the sodalite-like fcc YH10 and a Tc above room temperature, reaching 305–326 K at 250 GPa. The study suggests that dense hydrides consisting of these and related hydrogen polyhedral networks may represent new classes of potential very high-temperature superconductors.

Sign in / Sign up

Export Citation Format

Share Document