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Title: Evidence for breathing modes in direct current, pulsed, and high power impulse magnetron sputtering plasmas

We present evidence for breathing modes in magnetron sputtering plasmas: periodic axial variations of plasma parameters with characteristic frequencies between 10 and 100 kHz. A set of azimuthally distributed probes shows synchronous oscillations of the floating potential. They appear most clearly when considering the intermediate current regime in which the direction of azimuthal spoke motion changes. Breathing oscillations were found to be superimposed on azimuthal spoke motion. Depending on pressure and current, one can also find a regime of chaotic fluctuations and one of stable discharges, the latter at high current. A pressure-current phase diagram for the different situations is proposed.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [3] ;  [2] ;  [3]
  1. State Key Lab for Materials Processing and Die & Mold Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074 (China)
  2. (United States)
  3. Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720 (United States)
  4. (China)
Publication Date:
OSTI Identifier:
22489338
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 108; Journal Issue: 3; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; DIRECT CURRENT; FLUCTUATIONS; KHZ RANGE; MAGNETRONS; OSCILLATIONS; PERIODICITY; PHASE DIAGRAMS; PLASMA; POTENTIALS; PROBES; PULSES; SPUTTERING