Fig. 2.

Spin transport at 200 K for platinum wires along x: (a). Magnetic field parallel to wires (along x): The non-local signal R_el (blue) is zero at small fields, exhibits a sharp peak at the spin-flop field H_c, is finite above, and matches a theoretical model (see Methods for more details) based on the lowest magnon gap Δ (solid lines and inset: the inverse gap of one mode is reduced at H_c, whilst the other is enhanced) and μ_y·n (solid line). The thermal signal R_th remains low (black). (b) Magnetic field perpendicular to wires (along y): The field induced magnetization m is parallel to μ and perpendicular to n. R_el remains zero and R_th increases with field.