Microwave

Quantum mechanics

Force between magnets

Magnetic field

Magnetization

Metallurgy

Materials science

Ferromagnetism

Coupling (piping)

Energy–momentum relation

Classical mechanics

Magnon

Physics

Magnetic energy

Condensed matter physics

Center of mass (relativistic)

Microwave cavity

Physical Review Letters

We describe microwave cavity-magnomechanical center-of-mass cooling of a levitated magnetic sphere. The standing magnetic component of the electromagnetic wave within a microwave cavity exerts a dynamical force on a magnonic crystalline sphere and dissipates the mechanical energy through scattering into the magnon mode. The coupling is established by the magnetic dipole interaction and enriched by the collective spin motion. We find that the final cooled phonon occupation achieved is an intensive property independent of the mass and size of the sphere, in contrast to standard optomechanical couplings. This is of particular importance for testing quantum mechanics with macroscopic objects.

Intensive Cavity-Magnomechanical Cooling of a Levitated Macromagnet