Azimuthally unidirectional transport of energy in magnetoelectric fields. Topological Lenz effect

Abstract

Magnetic dipolar modes (MDMs) in a quasi 2D ferrite disk are microwave energy eigenstate oscillations with topologically distinct structures of rotating fields and unidirectional power flow circulations. At the first glance, this might seem to violate the law of conservation of an angular momentum, since the microwave structure with an embedded ferrite sample is mechanically fixed. However, an angular momentum is seen to be conserved if topological properties of electromagnetic fields in the entire microwave structure are taken into account. In this paper we show that due to the topological action of the azimuthally unidirectional transport of energy in a MDM resonance ferrite sample there exists the opposite topological reaction on a metal screen placed near this sample. We call this effect topological Lenz effect. The topological Lenz law is applied to opposite topological charges, one in a ferrite sample and another on a metal screen. The MDM originated near fields, the magnetoelectric (ME) fields, induce helical surface electric currents and effective charges on a metal. The fields formed by these currents and charges will oppose their cause.

References in corpus (6)

• Sagnac effect in resonant microcavities
• Vortices and chirality of magnetostatic modes in quasi-2D ferrite disk particles
• Casimir torque between nanostructured plates
• Rotation of a liquid crystal by the Casimir torque
• Microwave magnetoelectric fields: An analytical study of topological characteristics
• Rotational Doppler Effect in Magnetic Resonance

Cited by in corpus (3)

• Quantization of magnetoelectric fields
• Magnetic dipolar modes in magnon-polariton condensates
• Electrodynamics of magnetoelectric media and magnetoelectric fields