Spin dynamic response to a time dependent field

TL;DR

This paper investigates the dynamic response of a spin system in a time-dependent magnetic field using perturbation theory, revealing novel linear and nonlinear behaviors validated experimentally, with potential applications in signal filtering.

Contribution

It introduces a perturbative analysis of spin dynamics under time-dependent fields, uncovering new linear and nonlinear response regimes and experimentally validating these findings.

Findings

Identification of low-pass and band-pass response regimes

Experimental validation of theoretical predictions

Characterization of nonlinear features in spin response

Abstract

The dynamic response of a parametric system constituted by a spin precessing in a time dependent magnetic field is studied by means of a perturbative approach that unveils unexpected features, and is then experimentally validated. The first-order analysis puts in evidence different regimes: beside a tailorable low-pass-filter behaviour, a band-pass response with interesting potential applications emerges. Extending the analysis to the second perturbation order permits to study the response to generically oriented fields and to characterize several non-linear features in the behaviour of such kind of systems.