Local magnetic behavior across the first order phase transition in La(Fe0.9Co0.015Si0.085)13 magneto caloric compound

We visualize, with a magneto optical imaging technique with indicator film, the local magnetic response of the compound La(Fe0.9Co0.015Si0.085)13 during its first order magneto structural transition. The technique allowed to compare the stray fields of the main magneto caloric phase and of secondary phases present in the sample, thus to obtain the magnetic behaviour of each above and below the Curie temperature with respect the surrounds. Computing the change in the total magnetic flux, when the sample crosses the Curie point, both in cooling and heating, we are finally able to correlate the average thermal hysteresis of the transition with the local magnetic properties at single sites and analyse the influence of defects on the transition dynamics.