Anisotropy-enhanced giant reversible rotating magnetocaloric effect in HoMn2O5 single crystals

Magnetic and magnetocaloric properties of HoMn₂O₅ single crystals were investigated. HoMn₂O₅ undergoes a large conventional magnetocaloric effect around 10 K. The magnetocaloric effect was found to present a giant anisotropy. Consequently, a large magnetocaloric effect (-ΔS_R,_max= 12.43 J/kg K for 7 T) can be obtained simply by rotating the single crystal HoMn₂O₅ within the cb plane in constant magnetic field instead of moving it in and out of the magnetic field zone. This can open the way for the implementation of compact, simplified, and efficient rotary magnetic refrigerators.