Magnetic Nanoparticle SAR: Néel–Brownian Phase Map (2D)

This is the same relaxation physics as the 3D nanoparticle-ensemble simulator, recomputed as a 2D phase diagram instead of a rotating-particle scene. Every point in the main panel is an independent (core diameter, carrier viscosity) pair, colored by whether Néel (internal moment flip) or Brownian (whole-particle rotation) relaxation dominates the heat output there — the same τ_N and τ_B formulas the 3D model uses to decide how far each particle's arm and body rotate. A live marker tracks your slider settings across that map, an oscilloscope replays the phase-lagged field/moment waveform at a visible rate, and a hysteresis loop shows the heat delivered per cycle, with the same live SAR, relaxation-time and phase-lag readouts as the 3D version.