Effect of Minor Co Substitution for Ni on the Glass Forming Ability and Magnetic Properties of Gd₅₅Al₂₀Ni₂₅ Bulk Metallic Glass

Element substitution is usually used to improve the glass forming ability (GFA) and magnetic properties of alloys. We obtain Gd₅₅Al₂₀Ni₂₀Co₅ bulk metallic glass (BMG) by minor Co substitution for Ni in the Gd₅₅Al₂₀Ni₂₅ glass-forming alloy. The Gd₅₅Al₂₀Ni₂₀Co₅ BMG exhibits a better GFA and magnetocaloric effect (MCE) than the Gd₅₅Al₂₀Ni₂₅ BMG. The mechanism for the enhanced magnetic entropy change and refrigeration capacity of the Gd₅₅Al₂₀Ni₂₀Co₅ BMG is investigated.