Modeling of UV pulsed-laser ablation of metallic targets

Amoruso, S.

doi:10.1007/s003390051008

Cited by 131 publications

(39 citation statements)

References 30 publications

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“…The laser fluency was kept at ∼ 3 − 4 J/cm 2 , but taking into account optical path losses and laser beam homogenization, the fluency of ∼ 2 J/cm 2 is more realistic estimation. To facilitate nearly equiatomic composition in the FePt epitaxial superlattices (see, for example, [25,26]), the number of laser shots on the targets per one deposition period was 34 for Fe and 18 for Pt (taking into account different ablation [27,28] and reevaporation properties for Fe and Pt) with 12 periods in total. The composition of the films was verified by Energy Dispersive X-Ray Spectroscopy over the film surfaces.…”

Section: Pld Of Fept Thin Filmsmentioning

confidence: 99%

Quantitative model for tunable microstructure in magnetic FePt thin films by pulsed laser deposition

Golovchanskiy¹,

Fedoseev²,

Pan³

2013

J. Phys. D: Appl. Phys.

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Golovchanskiy, I. A., Fedoseev, S. A. & Pan, A. V. (2013). Quantitative model for tunable microstructure in magnetic FePt thin films by pulsed laser deposition. Journal of Physics D: Applied Physics, 46 (21), 215502-1-215502-8.Quantitative model for tunable microstructure in magnetic FePt thin films by pulsed laser deposition AbstractPulsed laser deposition (PLD) is employed to fabricate FePt L10 thin films from elemental targets. Dramatic structure variations are obtained by varying the laser frequency while keeping the thickness of the films constant. A new theoretical model based on the mean field approach is proposed, which quantitatively describes the structural changes obtained experimentally. The experiment and the model exhibit the opposite growth development to the trend reported for the modulated flux in the literature. The new model considers different growth rates in the lateral and transverse directions due to different responses of the normal and tangential film surfaces being deposited to the incident flux and the migration kinetics of adatoms and clusters. The quantitative results obtained confirm that the migration kinetics and self-assembly can easily be controlled by the PLD frequency which is consistent with the experiments. Magnetic properties of the films are shown to be extremely sensitive to the structure variations allowing practical tunability. © 2013 IOP Publishing Ltd. Abstract. Pulsed laser deposition (PLD) has been employed to fabricate FePt L1 0 thin films from elemental targets. Dramatic structure variations have been obtained by varying the laser frequency while keeping the thickness of the films constant. A new theoretical model based on the mean field approach is proposed, which quantitatively describes the structural changes obtained experimentally. The experiment and the model exhibit the opposite growth development to the trend reported for the modulated flux in the literature. The new model considers different growth rates in lateral and transverse directions due to different responses of the normal and tangential film surfaces being deposited to the incident flux and the migration kinetics of adatoms and clusters. The quantitative results obtained confirm that the migration kinetics and self-assembly can easily be controlled by the PLD frequency which is consistent with the experiments. Magnetic properties of the films are shown to be extremely sensitive to the structure variations allowing practical tunability.

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Section: Pld Of Fept Thin Filmsmentioning

confidence: 99%

Quantitative model for tunable microstructure in magnetic FePt thin films by pulsed laser deposition

Golovchanskiy¹,

Fedoseev²,

Pan³

2013

J. Phys. D: Appl. Phys.

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“…In general, for picosecond pulses the processing rate for shorter wavelengths exceeds the processing rate for longer wavelengths. This difference becomes more pronounced at higher fluences, while for nanosecond pulses the reverse situation is possible [20,21].…”

Section: Drilling Rate Of Five Metals With Pico-and Nanosecond Pulsesmentioning

confidence: 99%

Drilling rate of five metals with picosecond laser pulses at 355, 532, and 1064 nm

2012

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Experimental results on picosecond laser processing of aluminum, nickel, stainless steel, molybdenum, and tungsten are described. Hole drilling is employed for comparative analysis of processing rates in an air environment. Drilling rates are measured over a wide range of laser fluences (0.05-20 J/cm 2 ). Experiments with picosecond pulses at 355 nm are carried out for all five metals and in addition at 532 nm, and 1064 nm for nickel. A comparison of drilling rate with 6-ps and 6-ns pulses at 355 nm is performed. The dependence of drilling rate on laser fluence measured with picosecond pulses demonstrates two logarithmic regimes for all five metals. To determine the transition from one regime to another, a critical fluence is measured and correlated with the thermal properties of the metals. The logarithmic regime at high-fluence range with UV picosecond pulses is reported for the first time. The energy efficiency of material removal for the different regimes is evaluated. The results demonstrate that UV picosecond pulses can provide comparable quality and higher processing rate compared with literature data on ablation with near-IR femtosecond lasers. A significant contribution of two-photon absorption to the ablation process is suggested to explain high processing rate with powerful UV picosecond pulses.

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“…The value of about 750 K, higher than the boiling point of Pb (600 K), was obtained ignoring the plasma absorption of the laser pulse with our experimental conditions [25].…”

Section: -D) This Behaviour Is In Accordance Withmentioning

confidence: 65%

Characterisation of Pb thin films prepared by the nanosecond pulsed laser deposition technique for photocathode application

Lorusso¹,

Gontad²,

Broitman³

et al. 2015

Thin Solid Films

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Pb thin films were prepared by the ns pulsed laser deposition technique on Si (100) and polycrystalline Nb substrates for photocathode application. As the photoemission performances of a cathode are strongly affected by its surface characteristics, the Pb films were grown at different substrate temperatures with the aim of modifying the morphology and structure of thin films. Atomic force microscopy and scanning electron microscopy analyses showed a strong morphological change in the deposited films with the substrate temperature, and the formation of spherical grains at higher temperatures with the nucleation of large voids on the film surface. X-ray diffraction measurements showed that a preferred orientation of Pb (111)

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Modeling of UV pulsed-laser ablation of metallic targets

Cited by 131 publications

References 30 publications

Quantitative model for tunable microstructure in magnetic FePt thin films by pulsed laser deposition

Quantitative model for tunable microstructure in magnetic FePt thin films by pulsed laser deposition

Drilling rate of five metals with picosecond laser pulses at 355, 532, and 1064 nm

Characterisation of Pb thin films prepared by the nanosecond pulsed laser deposition technique for photocathode application

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