Backward magnetostatic surface spin waves in exchange coupled Co/FeNi bilayers

Abstract

Propagation of backward magnetostatic surface spin waves (SWs) in exchange coupled Co/FeNi bilayers are studied by using Brillouin light scattering (BLS) technique. Two types of SWs modes were identified in our BLS measurements. They are magnetostatic surface waves (MSSWs) mode and perpendicular standing spin waves (PSSWs) mode. The dispersion relations of MSSWs obtained from the Stokes and Anti-Stokes measurements display respectively positive and negative group velocities. The Anti-Stokes branch with positive phase velocities and negative group velocities, known as backward magnetostatic surface mode originates from the magnetostatic interaction of the bilayer. The experimental data are in good agreement with the theoretical calculations. Our results are useful for understanding the SWs propagation and miniaturizing SWs storage devices.

References in corpus (8)

• Direct observation of the Dzyaloshinskii-Moriya interaction in a Pt/Co/Ni film
• Exchange Magnon-Polaritons in Microwave Cavities
• Excitation of unidirectional exchange spin waves by a nanoscale magnetic grating
• Spin wave excitation in magnetic insulators by spin-transfer torque
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Cited by in corpus (2)

• Temperature-sensitive spin-wave nonreciprocity induced by interlayer dipolar coupling in ferromagnet/X (X=paramagnet, superconductor) hybrid systems
• Nonreciprocal collective magnetostatic wave modes in geometrically asymmetric bilayer structure with nonmagnetic spacer