PROJECT TITLE :

Directly Excited Backward Volume Spin Waves in Permalloy Microstrips

ABSTRACT:

A patterned magnetic microstrip will stay saturated along its length at remanence so the backward volume (BV) configuration may be a natural geometry for spin wave devices, nonetheless there are few experimental studies of spin waves during this geometry. During this paper, BV spin waves that were directly excited by a micrometer-sized antenna during a Permalloy microstrip were studied using microfocus Brillouin light scattering. The measured BV spin wave excitation efficiencies are approximately an order of magnitude smaller compared to the more commonly studied DamonEshbach configuration where the static magnetization is in-plane, perpendicular to the microstrip. Nevertheless, measureable signals were detected for a vary of fields as well as zero magnetic field, which is important for applications.