Magnetic properties and magneto-caloric effect (MCE) in Cu22Al18Ho22Tm20Gd18 amorphous ribbons

The magnetic cooling (MC) method developed by using magneto-caloric effect (MCE) of magnetic solids is generally taken as an excellent alternative way to widely used vapor expansion/compression based refrigerator due to its more environmental-friendly and higher energy-efficiency. In present work, systematic investigations of the melt-spun Cu22Al18Ho22Tm20Gd18 amorphous ribbon in terms of glass formation ability, magnetic and MCE properties have been reported. The undercooled liquid region and reduced glassy transition temperature for Cu22Al18Ho22Tm20Gd18 amorphous ribbon reach 28 K and 0.57, respectively. A broad typical ferromagnetic to paramagnetic transition (FM-PM, second ordered) around TC similar to 33.6 K accompanied by a considerable MCE is found in Cu22Al18Ho22Tm20Gd18 amorphous ribbon. The peak magnetic entropy change, temperature averaged entropy change with 5 K lift and refrigerant capacity values for Cu(22)Al(18)Ho(2)2Tm20Gd18 amorphous ribbon are 8.70 J/kgK, 8.65 J/kgK and 401.8 J/kg for AH = 0-5 T, respectively.