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We provide experimental details of the first experiment made in zerotemperature limit ($\sim$ 600\,$\mu$K) studying the magnonic black/white holehorizon analogue using absolutely pure physical system based on the spinsuperfluidity in superfluid $^3$He-B. We show that spin precession wavespropagating on the background of the spin super-currents in a channel betweentwo Bose-Einstein condensates of magnons in form of homogeneously precessingdomains mimic the properties of the black/white horizon. Once the white holehorizon is formed and blocks the propagation of the spin-precession wavesbetween two domains, we observed an amplification effect, i.e. when the energyof the spin precession waves reflected from the horizon is higher than theenergy of the excited spin precession waves before horizon was formed.Moreover, the estimated temperature of the spontaneous Hawking radiation inthis model system is about four orders of magnitude lower than the system'sbackground temperature what makes it a promising tool to study the effect ofspontaneous Hawking radiation.

Magnonic Analogue Black/White Hole Horizon in Superfluid $^3$He-B: experiment