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The implementation of processed magnetic materials onto thermoplastics can bean approach for practical application of brittle intermetallic materials withthe advantage of enlarging the range of applications. In the present work, weevaluate the effect of blending magnetocaloric Gd$_5$Si$_{2.4}$Ge$_{1.6}$micrometric particles with 3.4 $\mu$m in different weight fractions onto aflexible, transparent and non-magnetic poly(methyl methacrylate) (PMMA). Aclose to homogeneous grain distribution along the polymer surface were achieverby using a simple solvent casting method for evaluation of their magnetocaloricproperties. From XRD analysis, it was found a relative unit cell volumereduction of $\sim$2.5$\times$10$^3$ ppm for the composite with 70 wt.\% ofpowder as a result of interfacial interactions between the components. AlthoughPMMA does not influence the magnetic nature of microparticles main phase, areduction on the amount of secondary monoclinic phase occurs for all producedcomposite samples. As a consequence, a weakening on the effect of secondaryphases on the micropowder magnetocaloric response is observed as a result ofhydrostatic pressure from the difference between thermal expansions of matrixand filler.

Freestanding and flexible composites of magnetocaloric Gd$_5$(Si,Ge)$_4$ microparticles embedded in thermoplastic poly(methyl methacrylate) matrix