  Magnetic nano/microrotors are passive elements that spin around an axis due
to an external rotating field while remaining confined to a close plane. They
have been used to date in different applications related to fluid mixing, drug
delivery or biomedicine. Here we realize an active version of a magnetic
microgyroscope which is simultaneously driven by a photo-activated catalytic
reaction and a rotating magnetic field. We investigate the uplift dynamics of
this colloidal spinner when it stands up and precesses around its long axis
while self-propelling due to the light induced decomposition of hydrogen
peroxide in water. By combining experiments with theory, we show that activity
emerging from the cooperative action of phoretic and osmotic forces effectively
increase the gravitational torque which counteracts the magnetic and viscous
ones, and carefully measure its contribution.
