Fig. 1: Spin transport through the Morin transition (TM).
a Schematic of the nonlocal geometry of two electrically isolated Pt wires parallel to the in-plane projection of the easy axis. b Temperature dependence of the nonlocal spin signals for a magnetic field parallel to the platinum stripes (33 deg from the easy-axis). Error bars from counting statistic are smaller than the symbol size. c Top: The spin signal Vel is measured at the spin-flop field and approaches zero at low temperature, indicating a diffusive regime. Data obtained for an inter-stripe distance of 500 nm. Bottom: Spin-wave decay length (spin-diffusion length λ for T < TM and dephasing length L for T > TM) as a function of temperature for H applied along x at the spin-flop field (gray and red lines, respectively, correspond to fits with a magnon transport based on elliptically polarized spin waves (SWs) and on pairs of linearly polarized spin waves. The gray line would go to zero above the Morin transition due to the absence of elliptical spin waves. For modeling we used the following data: exchange field Hex = 1040 T, HDMI = 2.72 T, Han,in = 24 μT as in ref. 27).
