Magnetic refrigeration attracts increasing interests for its superior efficiency and eco-friendliness. The crystalline magnetocaloric materials usually exhibit large entropy change (ΔS_M) but narrow working temperature range, while the amorphous magnetocaloric materials usually exhibit broad working temperature range but skimpy ΔS_M at low temperatures. Herein, we designed Gd_90-xNi_xAl₁₀ (x = 5–15) amorphous/nanocrystalline composite fibers (ANCF) using melt extraction method in order to combine the advantages of amorphous and crystalline magnetocaloric materials. The Gd-based ANCF exhibits a giant refrigerant capacity (RC, 985 J kg^-1 for Gd₈₀Ni₁₀Al₁₀) across a wide temperature range from 70 K to 270 K that is much larger than the known magnetocaloric materials. This superior property is attributed to the ideal coupling between amorphous phase and crystalline Gd & [GdNi] phases that distribute homogeneously. This work provides not only promising refrigeration magnetic materials but also a general scaleable method for fabricating at the temperature range from room temperature to liquid nitrogen temperatures.

磁制冷因其卓越的效率和生态友好性而受到越来越多的关注。结晶磁热材料通常表现出大的熵变（Δ S _M）但工作温度范围窄，而非晶磁热材料通常表现出宽的工作温度范围但在低温下Δ S _M很小。在此，我们使用熔体萃取法设计了 Gd _90-x Ni _x Al ₁₀ (x = 5–15) 非晶/纳米晶复合纤维 (ANCF)，以结合非晶和结晶磁热材料的优点。基于 Gd 的 ANCF 表现出巨大的制冷剂容量（RC, 985 J kg ^-1 for Gd ₈₀Ni ₁₀ Al ₁₀ ) 跨越从 70 K 到 270 K 的宽温度范围，比已知的磁热材料大得多。这种优越的特性归因于非晶相和均匀分布的结晶 Gd 和 [GdNi] 相之间的理想耦合。这项工作不仅提供了有前途的制冷磁性材料，而且还提供了一种在室温至液氮温度范围内制造的通用可扩展方法。