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Coherent precession of trapped Bose-Einstein condensates of magnons is asensitive probe for magnetic relaxation processes in superfluid 3He-B down tothe lowest achievable temperatures. We use the dependence of the relaxationrate on the density of thermal quasiparticles to implement thermometry in 3He-Bat temperatures below 300 $\mu$K. Unlike popular vibrating wire or quartztuning fork based thermometers, magnon condensates allow for contactlesstemperature measurement and make possible an independent in situ determinationof the residual zero-temperature relaxation provided by the radiation damping.We use this magnon-condensate-based thermometry to study the thermal impedanceof the interface between A and B phases of superfluid 3He. The magnoncondensate is also a sensitive probe of the orbital order-parameter texture.This has allowed us to observe for the first time the non-thermal signature ofthe annihilation of two AB interfaces.

Microkelvin thermometry with Bose-Einstein condensates of magnons and applications to studies of the AB interface in superfluid $^3$He