  We present a method for measuring the magnetic field that allows hyperfine
and Zeeman optical pumping, excitation and detection of magnetic resonance by
means of a single laser beam with time-modulated ellipticity. This improvement
allows us to significantly simplify the Bell-Bloom magnetometric scheme, while
retaining its sensitivity. The method does not require the use of radio
frequency fields, which is essential when creating arrays of sensors. The
results of experimental studies demonstrate the efficiency of the proposed
method and its potential applicability in most challenging
magnetoencephalographic tasks.
