Controlling Magnonic Spin Current through Magnetic Anisotropy and Gilbert Damping
arXiv (Cornell University)(2023)
摘要
The magnon propagation length, (MPL) of a ferro/ferrimagnet (FM) is one of
the key factors that controls the generation and propagation of
thermally-driven spin current in FM/heavy metal (HM) bilayer based
spincaloritronic devices. Theory predicts that for the FM layer, MPL is
inversely proportional to the Gilbert damping (alpha) and the square root of
the effective magnetic anisotropy constant (K_eff). However, direct
experimental evidence of this relationship is lacking. To experimentally
confirm this prediction, we employ a combination of longitudinal spin Seebeck
effect (LSSE), transverse susceptibility, and ferromagnetic resonance
experiments to investigate the temperature evolution of MPL and establish its
correlation with the effective magnetic anisotropy field, H_K^eff (proportional
to K_eff) and alpha in Tm3Fe5O12 (TmIG)/Pt bilayers. We observe concurrent
drops in the LSSE voltage and MPL below 200 K in TmIG/Pt bilayers regardless of
TmIG film thickness and substrate choice and attribute it to the noticeable
increases in H_K^eff and alpha that occur within the same temperature range.
From the TmIG thickness dependence of the LSSE voltage, we determined the
temperature dependence of MPL and highlighted its correlation with the
temperature-dependent H_K^eff and alpha in TmIG/Pt bilayers, which will be
beneficial for the development of rare-earth iron garnet-based efficient
spincaloritronic nanodevices.
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关键词
magnonic spin current,magnetic anisotropy,gilbert
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