Magnon hybridization in ferrimagnetic heterostructures

Abstract

We study magnon hybridization in a ferrimagnetic heterostructure consisting of ultrathin gadolinium iron garnet and yttrium iron garnet layers and show the localized and extended spatial profiles of the magnon modes with different polarizations. These modes are expected to have distinct thermal excitation properties in the presence of a temperature gradient across the heterostructure. From a quantitative analysis of their consequences on longitudinal spin Seebeck effect, we predict an observable shift of the sign-changing temperature with respect to the one previously observed in gadolinium iron garnet. Moreover, the sign-changing point of spin Seebeck signal is found to be tunable by YIG thickness. Our results suggest the necessity of taking into account the temperature difference between the magnon modes in ferrimagnetic heterostructures.

9 pages, 5 figures

References in corpus (7)

• Spin Seebeck insulator
• Theory of magnon-driven spin Seebeck effect
• Spin Seebeck effect in antiferromagnets and compensated ferrimagnets
• Chiral spin-wave velocities induced by all-garnet interfacial Dzyaloshinskii-Moriya interaction in ultrathin yttrium iron garnet films
• First-Principles Study of Exchange Interactions of Yttrium Iron Garnet
• Theory of spin transport through antiferromagnetic insulator
• Orbital Nernst Effect of Magnons