  The classical laws of physics are usually invariant under time reversal.
Here, we reveal a novel class of magnetomechanical effects rigorously breaking
time-reversal symmetry. The effect is based on the mechanical rotation of a
hard magnet around its magnetization axis in the presence of friction and an
external magnetic field, which we call spin revolution. The physical reason for
time-reversal symmetry breaking is the spin revolution and not the dissipation.
The time-reversal symmetry breaking leads to a variety of unexpected effects
including upward propulsion on vertical surfaces defying gravity as well as
magnetic gyroscopic motion that is perpendicular to the applied force. In
contrast to the spin, the angular momentum of spin revolution can be parallel
or antiparallel to the equilibrium magnetization. The spin revolution emerges
spontaneously, without external rotations, and offers various applications in
areas such as magnetism, robotics and energy harvesting.
