• Proceedings of the Korean Institute of Surface Engineering Conference
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• 1999.05a
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• pp.134-134
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• 1999

• 한국전기화학회:학술대회논문집
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• 1999.04a
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• pp.71-71
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• 1999

• Proceedings of the Materials Research Society of Korea Conference
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• 2002.11a
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• pp.72-72
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• 2002

• Proceedings of the Korean Magnestics Society Conference
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• 1999.10a
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• pp.134-135
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• 1999

• Journal of the Korean Magnetics Society
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• v.3 no.3
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• pp.221-228
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• 1993

The general requirements of recording media include recording performance, environmental stability, runnability on the drive or deck, and manufacturability. CoCrMo thin films were prepared using RF sputtering system for a study on chemical stability. Surface degradation of the CoCrMo thin film was studied by SEM, XPS and AES. Surface degradation was found to be dependent of sputtering condition and Mo content. Addition of Mo to CoCr thin film improved dramatically its surface degradation resistance in dilute sulfuric acid, as indicated by active-passive transition appeared in electrochemical polarization curve. Futhermore, the passive current density was decreased with increasing Mo content. The reduction in a number density of corrosion sites by Mo addition vms observed, after accelerated corrosion test. AES survey indicated that corrosion occured on the site with Cr depletion and highly concentrated chloride ions.

• Journal of the Korean Electrochemical Society
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• v.8 no.1
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• pp.37-41
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• 2005

We investigated the electrochemical properties and microstructure on the various argon deposition pressure $(P_{Ar})$ and the low annealing temperature $(400^{\circ}C)$ of $LiCoO_2$ cathodes, which deposited by R.F. magnetron sputtering. The microsuucture and composition of Lico02 thin film was changed as a function of $P_{Ar}$. The capacity and electrochemical properties were improved with Ph of $LiCoO_2$ thin films. The cycling reversibility and stability of thin film batteries were measured by cyclic voltammetry and the constant current charge-discharge. The physical properties of cathode films were analyzed by ICP-AES, XRD, SEM and AFM for composition, crystallization and surface morphology.

• Journal of the Korean Society for Heat Treatment
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• v.21 no.1
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• pp.3-9
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• 2008

Al-Co-N thin films, Al-Co-N/Al-N and Al-Co-N/Al-Co multilayers containing various amounts of Co content were deposited by using a two-facing targets type dc sputtering (TFTS) system. The films were also annealed successively and isothermally at different annealing temperatures. Irrespective of Co content and preparation methods, all the as-deposited films were observed non-magnetized. It was found that annealing conditions can control the magnetic and electrical properties as well as the microstructure of the films.

• Proceedings of the KIEE Conference
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• 1997.07d
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• pp.1485-1487
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• 1997

Platinum-Cobalt alloy thin films were deposited on $Al_2O_3$ substrates by co sputtering for RTD temperature sensors. We made Pt-Co alloy resistance patterns on $Al_2O_3$ substrate by lift-off method and investigated the physical and electrical characteristics of these films under sputtering conditions (; the input power, working vacuum), annealing conditions (; temperature, time) and also after annealing these films. After the annealing treatment at $800^{\circ}C$ for 60min, the resistivity and sheet resistivity of Pt-Co thin films was $0.0302{\mu}{\Omega}{\cdot}cm$ and $0.1{\Omega}/{\square}$, respectively, and the TCR value of Pt-Co RTD was $3600ppm/^{\circ}C$ in the temperature range of $25{\sim}400^{\circ}C$. These results indicate that Pt-Co thin films have potential for the excellent RTD temperature sensors.

• Journal of the Korean Ceramic Society
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• v.42 no.3 s.274
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• pp.211-217
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• 2005

[ $Zn_{1-x}Co_{x}O$ (x=0-0.3) films were grown on Corning 7059 glasses by asymmetrical bipolar pulsed dc magnetron sputtering. The c-axis orientation along (002) plane was enhanced with increasing Co concentration. The $Zn_{1-x}Co_{x}O$ films are grown with fibrous grains of tight dome shape. The transmittance spectra measured from UV-visible showed that sp-d exchange interactions and typical d-d transitions become activated with increasing Co concentration. The electrical resistivity of $Zn_{1-x}Co_{x}O$ films increased with increasing Co concentration, especially it increased greatly at $30at\% Co. X-ray photoelectron spectroscopy and alternating gradient magnetometer analyses indicated that no Co metal cluster is formed and the ferromagnetic properties are exhibited. The low electrical resistivity and room temperature ferromagnetism of $Zn_{1-x}Co_{x}O$ thin films suggested the possibility of the application to Diluted Magnetic Semiconductors (DMSs).

• Proceedings of the Korean Ceranic Society Conference
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• 2004.04b
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• pp.36.3-36.3
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• 2004