Magnetic properties and large magneto-caloric effect in the amorphous Ho0.2Tm0.2Gd0.2Co0.2Al0.2 ribbon

We fabricated the amorphous Ho _0.2Tm _0.2Gd _0.2Co _0.2Al _0.2 ribbon by melt-spun method and systematically investigated its glass forming ability (GFA) and magnetic properties, especially of the magnetic phase transition (MPT) and magneto-caloric (MC) effect. The melt-spun Ho _0.2Tm _0.2Gd _0.2Co _0.2Al _0.2 ribbon is found to exhibit a fully amorphous structure and good GFA. The amorphous Ho _0.2Tm _0.2Gd _0.2Co _0.2Al _0.2 ribbon undergoes a second order type MPT around 32.6 K from ferromagnetic to paramagnetic state. Large reversible low temperature MC effect and good MC performances in the amorphous Ho _0.2Tm _0.2Gd _0.2Co _0.2Al _0.2 ribbon were realized which was identified by the parameters of magnetic entropy change, temperature-averaged entropy change, and refrigerant capacity. These parameters are are at similarly high level with recently reported low temperature MC materials, making the amorphous Ho _0.2Tm _0.2Gd _0.2Co _0.2Al _0.2 ribbon also attractive for magnetic cooling.