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The magnon propagation length, (MPL) of a ferro/ferrimagnet (FM) is one ofthe key factors that controls the generation and propagation ofthermally-driven spin current in FM/heavy metal (HM) bilayer basedspincaloritronic devices. Theory predicts that for the FM layer, MPL isinversely proportional to the Gilbert damping (alpha) and the square root ofthe effective magnetic anisotropy constant (K_eff). However, directexperimental evidence of this relationship is lacking. To experimentallyconfirm this prediction, we employ a combination of longitudinal spin Seebeckeffect (LSSE), transverse susceptibility, and ferromagnetic resonanceexperiments to investigate the temperature evolution of MPL and establish itscorrelation with the effective magnetic anisotropy field, H_K^eff (proportionalto K_eff) and alpha in Tm3Fe5O12 (TmIG)/Pt bilayers. We observe concurrentdrops in the LSSE voltage and MPL below 200 K in TmIG/Pt bilayers regardless ofTmIG film thickness and substrate choice and attribute it to the noticeableincreases in H_K^eff and alpha that occur within the same temperature range.This study not only highlights the ability to manipulate MPL by controllingH_K^eff and alpha in FM/HM based spincaloritronic nanodevices, but also showsthat the tuning of alpha is more effective than H_K^eff in controlling MPL and,hence, the spincaloritronic efficiency.

Controlling Magnonic Spin Current through Magnetic Anisotropy and Gilbert Damping