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We study heat flux avalanches occurring at the first order transition inLa(Fe-Mn-Si)$_{13}$-H$_{1.65}$ magnetocaloric material. As the transition isassociated to the phase boundaries motion that gives rise to the latent heat,we develop a non equilibrium thermodynamic model. By comparing the model withexperimental calorimetry data available for Mn=0.18, we find the values of theintrinsic kinetic parameter $R_L$, expressing the damping for the movingboundary interface, at different magnetic fields. We conclude that byincreasing field, thus approaching the critical point, the avalanches increasein number and their kinetics is slowed down.

Kinetics of heat flux avalanches at the first order transition in La(Fe-Mn-Si)$_{13}$-H$_{1.65}$ compounds