Controlling magnetostructural transition and magnetocaloric effect in multi-component transition-metal-based materials

Tunable magnetocaloric effect in transition metal alloys

The unpredictability of geopolitical tensions and resulting supply chain and pricing instabilities make it imperative to explore rare earth free magnetic materials. As such, we have investigated fully transition metal based "high entropy alloys" in the context of the magnetocaloric effect. We find the NiFeCoCrPdx family exhibits a second order magnetic phase transition whose critical temperatur...

Tuning the phase transition in transition-metal-based magnetocaloric compounds

Unveiling the (De)coupling of magnetostructural transition nature in magnetocaloric R5Si2Ge2 (R5Tb, Gd) materials

Magnetostructural transition in Gd5Sb0.5Ge3.5

Magnetic and crystallographic properties of Gd5Sb0.5Ge3.5 were investigated using dc magnetization, ac magnetic susceptibility, and heat capacity of an oriented single crystal, combined with temperature and magnetic field dependent x-ray powder diffraction. The compound undergoes an unusual magnetostructural transition at 40 K and a nonmagnetic second-order transition around 63 K. The detailed ...

Taming the first-order transition in giant magnetocaloric materials.

Large magnetically driven temperature changes are observed in MnFe(P,Si,B) materials simultaneously with large entropy changes, limited (thermal or magnetic) hysteresis, and good mechanical stability. The partial substitution of B for P in MnFe(P,Si) compounds is found to be an ideal parameter to control the latent heat observed at the Curie point without deteriorating the magnetic properties, ...