  In magnetized capacitively coupled radio-frequency discharges operated at low
pressure the influence of the magnetic flux density on discharge properties has
been studied recently both by experimental investigations and in simulations.
It was found that the Magnetic Asymmetry Effect allows for a control of the DC
self-bias and the ion energy distribution by tuning the magnetic field
strength. In this study, we focus on experimental investigations of the
electron power absorption dynamics in the presence of a magnetron-like magnetic
field configuration in a low pressure capacitive RF discharge operated in
argon. Phase Resolved Optical Emission Spectroscopy measurements provide
insights into the electron dynamics on a nanosecond-timescale. The magnetic
flux density and the neutral gas pressure are found to strongly alter these
dynamics. For specific conditions energetic electrons are efficiently trapped
by the magnetic field in a region close to the powered electrode, serving as
the target surface. Depending on the magnetic field strength an electric field
reversal is observed that leads to a further acceleration of electrons during
the sheath collapse. These findings are supported by 2-dimensional Particle in
Cell simulations that yield deeper insights into the discharge dynamics.
