32 Result(s)

Article

Laser Dry Cleaning of ZrO₂ Particles from Air Bearing Surface of Magnetic Head Sliders

Laser dry cleaning of ZrO₂ particles from air bearing surface(ABS) of magnetic head sliders has been investigated. The experimental results show that the cleaning threshold of removing ZrO₂ particles from ABS is ...

Y. F. Lu, W. D. Song, M. H. Hong, T. C. Chong, T. S. Low in MRS Online Proceedings Library (1995)

Article

Mechanism of and method to avoid discoloration of stainless steel surfaces in laser cleaning

O₃. Based on Auger Electron Spectroscopy analyses and optical microscopic observations, γ-Fe₂O₃ and Fe₃O₄ are formed on the stainless steel surface in laser cleaning in the air. Since laser can induce high temper...

Y.F. Lu, W.D. Song, M.H. Hong, T.C. Chong, T.S. Low in Applied Physics A (1997)

Article

A theoretical model for laser removal of particles from solid surfaces

Y.F. Lu, W.D. Song, B.W. Ang, M.H. Hong, D.S.H. Chan, T.S. Low in Applied Physics A (1997)

Article

Theoretical Modeling for Laser Cleaning of Micro-Particles from Solid Surface

In laser cleaning of micro-particles from solid surface, the adhesion force between the particles and the substrate surface and the thermal expansion of both particles and substrate play important roles in det...

Y. F. Lu, W. D. Song, M. H. Hong, D. S. H. Chan… in MRS Online Proceedings Library (1997)

Article

A Theoretical Model for Steam Laser Cleaning

A theoretical model for removal of tiny particles from solid surface covered with a thin liquid film by laser cleaning is established by taking adhesion force and cleaning force into account. When pulsed laser...

Y. F. Lu, Y. Zhang, W. D. Song, T. S. Low in MRS Online Proceedings Library (1998)

Article

Pulsed Laser Deposition of High Coercivity Barium Ferrite Films

Barium ferrite films with high coercivity (>2000 Oe) have been prepared on single crystal sapphire substrates by laser in-situ deposition. The structures of these films were characterized by x-ray diffractomet...

W. D. Song, Y. F. Lu, J. P. Wang, X. T. Zeng, L. Lu… in MRS Online Proceedings Library (1998)

Article

Studies of Carbon Nitride Thin Films Synthesized by KrF Excimer Ablation of Graphite in Nitrogen Atmosphere

Carbon nitride thin films were deposited on silicon wafers by pulsed KrF excimer laser (wavelength 248 nm, duration 23 ns) ablation of graphite in nitrogen atmosphere. Different fluences of the excimer laser a...

Z. M. Ren, Y. F. Lu, W. D. Song, D. S. H. Chan, T. S. Low… in MRS Online Proceedings Library (1998)

Article

An energy approach to the modelling of particle removal by pulsed laser irradiation

An energy model to explain particle removal mechanism has been developed. This model is based on a detailed investigation of contact deformation of a particle on a solid surface, as well as particle motion dur...

Y.F. Lu, Y.W. Zheng, W.D. Song in Applied Physics A (1999)

Article

Scanning tunnelling microscopy imaging and modification of hydrogen-passivated Ge(100) surfaces

Scanning tunnelling microscopy (STM) study and modification of hydrogen (H)-passivated Ge(100) surfaces have been investigated. Thermal oxidation procedures were used to minimise surface roughness. Ge samples ...

Y.F. Lu, Z.H. Mai, W.D. Song, W.K. Chim in Applied Physics A (2000)

Article

Laser writing of a subwavelength structure on silicon (100) surfaces with particle-enhanced optical irradiation

Spherical 0.5-μm silica particles were placed on a silicon (100) substrate. After laser illumination with a 248-nm KrF excimer laser, hillocks with size of about 100 nm were obtained at the original position o...

Y. F. Lu, L. Zhang, W. D. Song, Y. W. Zheng… in Journal of Experimental and Theoretical Ph… (2000)

Article

Laser Writing of Nanostructures on Magnetic Film Surfaces With Optical Near Field Effects

Laser directly writing of nanostrucrures on magnetic film surfaces with optical near field effects has been investigated. Spherical 0.99 m or 0.47 m silica particles were placed on Cr/CoCrPt multilayers. After...

S. M. Huang, M. H. Hong, B. S. Luk’yanchuk, W. D. Song… in MRS Online Proceedings Library (2002)

Article

Laser-induced removal of flash from heat sinks in integrated circuit packages

Laser-induced removal of flash from heat sinks in integrated circuit (IC) packages has been studied. It is found that flash can be effectively removed from heat sinks in plastic IC packages by laser deflashing...

W.D. Song, M.H. Hong, S.M. Huang, S.Y. Chan, Y.F. Lu, T.C. Chong in Applied Physics A (2002)

Article

Photoluminescence from Silicon Nanocrystals Formed by Pulsed-Laser Deposition

Si nanocrystals (NCs) consisting of small crystals from 1 to 20 nm were formed by pulsedlaser deposition (PLD) in inert Ar gas and reactive O₂ gas. The oxygen content of the Si NCs increases with increasing O₂ am...

X. Y. Chen, Y. F. Lu, Y. H. Wu, B. J. Cho, W. D. Song… in MRS Online Proceedings Library (2003)

Article

Pulsed laser deposition of oriented barium ferrite (BaFe₁₂O₁₉) thin films

Barium ferrite (BaFe₁₂O₁₉) thin films have been deposited by pulsed laser deposition at 900 °C in 250 mTorr oxygen on Si substrates with Pt (111) underlayers. The barium ferrite films contained platelet grains an...

X.H. Liu, M.H. Hong, W.D. Song, G.X. Chen, J.F. Chong, J.P. Wang… in Applied Physics A (2004)

Article

Particle on surface: 3D-effects in dry laser cleaning

Previous analysis of dry laser cleaning within the frame of a one-dimensional (1D) model with homogeneous surface heating shows that this model disagrees with experiments by one–two orders of magnitude. The pa...

B.S. Luk’Yanchuk, Z.B. Wang, W.D. Song, M.H. Hong in Applied Physics A (2004)

Article

Laser synthesis of new materials

The dual-beam laser ablation of different targets for synthesizing new materials within the overlap** plasma area has been investigated. This method is termed ‘laser synthesis of new materials’ and it is fle...

W.D. Song, M.H. Hong, T. Osipowicz, D.Y. Dai, S.I. Pang, Y.Z. Peng… in Applied Physics A (2004)

Article

Growth Temperature and Properties of Ge₄Sb₃Te₃ Films

The growth temperature and properties of Ge₄Sb₃Te₃ thin films are presented in this paper. The critical growth temperature of Ge₄Sb₃Te₃ is between 300 and 340 °C. The Ge₄Sb₃Te₃ films can only be grown on a substr...

W. D. Song, L. P. Shi, X. S. Miao, X. Hu, H. K. Lee… in MRS Online Proceedings Library (2004)

Article

Structural and Optical Properties of Co-Doped ZnO Thin Films

Co-doped zinc oxide thin films (Zn_1−xCo _x O) have been deposited on c-plane sapphire substrates by dual-beam pulsed laser deposition. The films have lattice parameters similar to...

Y. Z. Peng, T. Liew, W. D. Song, C. W. An, K. L. Teo… in Journal of Superconductivity (2005)

Article

Barium ferrite (BaFe₁₂O₁₉) thin films prepared by pulsed laser deposition on MgO buffered Si substrates

Barium ferrite (BaFe₁₂O₁₉) thin films have been deposited by pulsed laser deposition (PLD) on Si substrates with MgO underlayers. The films were deposited in oxygen atmosphere by excimer laser (λ=248 nm, pulse du...

X.H. Liu, M.H. Hong, W.D. Song, G.X. Chen, H.M.J. Lam, J.P. Wang… in Applied Physics A (2005)

Article

Room temperature diluted magnetic semiconductor synthesized by dual beam laser deposition

Diluted magnetic semiconductor Co-doped ZnO film has been synthesized by a dual beam pulsed laser deposition method. The magnetic, electrical, and optical properties of the Zn_0.985Co_0.015O_0.67 film are studied in...

Y.Z. Peng, W.D. Song, C.W. An, J.J. Qiu, J.F. Chong, B.C. Lim… in Applied Physics A (2005)