Quantum fluctuation in rotation velocity of a levitated magnetic particle

Abstract

We consider a ferromagnetic particle levitated in air under microwave irradiation and theoretically study the noise in its rigid-body rotation induced by the gyromagnetic effect. This rotational noise includes useful information on angular momentum transfer from the magnetization to the rigid-body rotation, such as the unit of angular momentum per one spin relaxation process. We formulate the rotational noise in terms of the Lindblad equation, which describes the quantum stochastic process, and estimate it in the case of realistic experimental parameters. We show that a bifurcation phenomenon observed in our setup amplifies the noise and, therefore, can be exploited making an accurate measurement of the rotational noise.

11 pages, 4 figures

References in corpus (11)

• Millikelvin cooling of an optically trapped microsphere in vacuum
• Levitodynamics: Levitation and control of microscopic objects in vacuum
• Effects of mechanical rotation on spin currents
• Global polarization of $\Xi$ and $\Omega$ hyperons in Au+Au collisions at $\sqrt{s_{{}_{NN}}}$ = 200 GeV
• Nanomechanical Detection of Itinerant Electron Spin Flip
• Angular momentum compensation manipulation to room temperature of the ferrimagnet Ho${}_{3-x}$Dy${}_x$Fe${}_5$O${}_{12}$ detected by the Barnett effect
• The Einstein - de Haas effect at radio frequencies in and near magnetic equilibrium
• Master equation approach to magnon relaxation and dephasing
• Electron spin-vorticity coupling in low and high Reynolds number pipe flows
• Dissipation-induced rotation of suspended ferromagnetic nanoparticles
• Gyromagnetic bifurcation in a levitated ferromagnetic particle