Field-induced transition from parallel to perpendicular parametric pumping for a microstrip transducer

TL;DR

This paper investigates how microstrip transducers induce a transition from parallel to perpendicular parametric pumping in magnetic films, revealing a critical field where the threshold behavior changes sharply due to spatial confinement effects.

Contribution

It demonstrates the field-induced transition between pumping regimes in microstrip transducers and characterizes the associated threshold behavior and spatial effects.

Findings

Transition from parallel to perpendicular pumping at critical field H_c

Sharp increase in threshold above H_c due to spatial confinement

Minimal threshold observed at the transition point

Abstract

Microstrip transducers used for the excitation of spin waves in magnetic films possess two characteristic properties: high spatial localization of the microwave magnetic field and the presence of field components parallel and perpendicular to the bias field. Here, the effects of these features on the process of parametric pumping are presented. By microwave measurements of the spin-wave instability threshold a transition from parallel pumping to perpendicular pumping at the critical field $H_{\rm c}$ with the minimal threshold is observed. This transition is accompanied by a sharp threshold increase above the critical field due to the spatial confinement of the pump region.