Magnon mode selective spin transport in compensated ferrimagnets

Abstract

We investigate the generation of magnonic thermal spin currents and their mode selective spin transport across interfaces in insulating, compensated ferrimagnet/normal metal bilayer systems. The spin Seebeck effect signal exhibits a non-monotonic temperature dependence with two sign changes of the detected voltage signals. Using different ferrimagnetic garnets, we demonstrate the universality of the observed complex temperature dependence of the spin Seebeck effect. To understand its origin, we systematically vary the interface between the ferrimagnetic garnet and the metallic layer, and by using different metal layers we establish that interface effects play a dominating role. They do not only modify the magnitude of the spin Seebeck effect signal but in particular also alter its temperature dependence. By varying the temperature, we can select the dominating magnon mode and we analyze our results to reveal the mode selective interface transmission probabilities for different magnon modes and interfaces. The comparison of selected systems reveals semi-quantitative details of the interfacial coupling depending on the materials involved, supported by the obtained field dependence of the signal.

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Cited by in corpus (23)

• Observation of the Magnon Polarization
• Gilbert damping phenomenology for two-sublattice magnets
• Spin pumping and shot noise in ferrimagnets: bridging ferro- and antiferromagnets
• Spin Seebeck Effect: Sensitive Probe for Elementary Excitation, Spin Correlation, Transport, Magnetic Order, and Domains in Solids
• Pure spin currents in magnetically ordered insulator/normal metal heterostructures
• Orbital Magnetic Moment of Magnons
• Synthetic antiferromagnetic coupling between ultra-thin insulating garnets
• A review of modelling in ferrimagnetic spintronics
• First-principles study of magnon-phonon interactions in gadolinium iron garnet
• Spin splitting induced in a superconductor by an antiferromagnetic insulator
• Spin transport across antiferromagnets induced by the spin Seebeck effect
• Differences in the magnon diffusion length for electrically and thermally driven magnon currents in Y${}_3$Fe${}_5$O${}_{12}$
• Electric Field Switching of Magnon Spin Current in a Compensated Ferrimagnet
• Magnetic coupling in Y${}_3$Fe${}_5$O${}_{12}$/Gd${}_3$Fe${}_5$O${}_{12}$ heterostructures
• Static magnetic proximity effects and spin Hall magnetoresistance in Pt/Y${}_3$Fe${}_5$O${}_{12}$ and inverted Y${}_3$Fe${}_5$O${}_{12}$/Pt bilayers
• Tuning the diffusion of magnon in Y3Fe5O12 by light excitation
• Absence of evidence of spin transport through amorphous Y${}_3$Fe${}_5$O${}_{12}$
• Understanding spin currents from magnon dispersion and polarization: Spin-Seebeck effect and neutron scattering study on Tb3Fe5O12
• Neutron Scattering Study on Yttrium Iron Garnet for Spintronics
• Néel domain wall as a tunable filter for optically excited magnetostatic waves
• Electrical manipulation of spin pumping signal through nonlocal thermal magnon transport
• Spin current compensation from competing magnon modes in ferrimagnets
• Scaling of the thermally induced sign inversion of longitudinal spin Seebeck effect in a compensated ferrimagnet: Role of magnetic anisotropy