Influence of steering magnetic field on the time-resolved plasma chemistry in cathodic arc discharges

EHIASARIAN, Arutiun, HOVSEPIAN, Papken, NEW, Roger and VALTER, J. (2005). Influence of steering magnetic field on the time-resolved plasma chemistry in cathodic arc discharges. In: XXIst International Symposium on Discharges and Electrical Insulation in Vacuum, 2004. Proceedings. ISDEIV. Proceedings - International Symposium on Discharges and Electrical Insulation in Vacuum, ISDEIV, 2 (685). Institute of Electrical and Electronics Engineers Inc., 521-524.

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Link to published version:: 10.1109/DEIV.2004.1422664

Abstract

External magnetic fields are used extensively to steer the cathode spot of arc discharges in order to improve target utilization and minimize droplet generation. A combination of a permanent magnet array and an electromagnetic coil was used to vary the shape and strength of the magnetic field on the cathode surface. Finite element modeling of the magnetic field distribution identified two types of geometry - through field, with lines normal to the cathode surface, and arched-field, with lines forming a magnetic "tunnel". Optical emission spectroscopy (OES) and electrostatic probe measurements in a Cr arc discharge were used to characterize the effect of the external magnetic field on the ion flux to the substrates and on the composition and time evolution of the plasma. The total ion saturation current density at the substrate position was in the range between 2 and 11.5 mAcm -2 depending on the magnetic field shape. The magnetic field strongly influenced the relative optical emission from Cr0, Cr 1+ and Cr2+ metal species, and the resulting charge state distribution. Time-resolved OES and probe measurements of a particular position on the arc cathode revealed that an Ar plasma is trapped near the cathode and is sustained even when the cathode spot is a significant distance from the observation volume. The importance of this "residual" Ar plasma for the charge state distribution of metal ions is discussed. 2004 IEEE.

Item Type: Book Section
Additional Information: Proceedings of the XXlst International Symposium on Discharges and Electrical Insulation in Vacuum held at Yalta, Crimea, Sept. 27,2004 - Oct. 1,2004.
Research Institute, Centre or Group: Materials and Engineering Research Institute > Thin Films Research Centre > Nanotechnology Centre for PVD Research
Identification Number: 10.1109/DEIV.2004.1422664
Depositing User: Arutiun Ehiasarian
Date Deposited: 14 Sep 2011 15:39
Last Modified: 14 Sep 2011 15:39
URI: http://shura.shu.ac.uk/id/eprint/2467

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