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Transfer of spin angular momentum across the interface between a ferromagnetic (FM) and a non-magnetic (NM) materials can drive magnetization reversal and induce non-equilibrium condensation of magnons. In this talk, I will discuss two recently discovered mechanisms for generating pure spin currents across the FM/NM interface. One mechanism is spin Seebeck effect arising from a temperature gradient across the interface. The other mechanism relies on spin-orbit scattering in the FM [1] and is closely related to anisotropic magneto-resistance. We experimentally demonstrate that both mechanisms can give rise to high spin current densities leading to condensation of magnons into a macroscopic phase-coherent state [1, 2]. 1. C. Safranski, et al., Nature Nanotechnology 14, 27 (2019) 2. C. Safranski et al., Nature Communications 8, 117 (2017)