Exchange bias (EB) is a crucial property with widespread applications but particularly occurs by complex interfacial magnetic interactions after field cooling. To date, intrinsic zero-field-cooled EB (ZEB) has only emerged in a few bulk frustrated systems and their magnitudes remain small yet. Here, enabled by high temperature synthesis, we uncover a colossal ZEB field of 4.95 kOe via tuning compensated ferrimagnetism in a family of kagome metals, which is almost twice the magnitude of known materials. Atomic-scale structure, spin dynamics, and magnetic theory revealed that these compensated ferrimagnets originate from significant antiferromagnetic exchange interactions embedded in the holmium–iron ferrimagnetic matrix due to supersaturated preferential manganese doping. A random antiferromagnetic order of manganese sublattice sandwiched between ferromagnetic iron kagome bilayers accounts for such unconventional pinning. The outcome of the present study outlines disorder-induced giant bulk ZEB and coercivity in layered frustrated systems.

中文翻译：

---

通过调节 Kagome 金属中的补偿亚铁磁性来实现巨大的零场冷却交换偏置


交换偏压 (EB) 是一种具有广泛应用的重要特性，但特别是在场冷却后复杂的界面磁相互作用中发生。迄今为止，内在的零场冷却 EB (ZEB) 仅出现在少数大型受挫系统中，并且其幅度仍然很小。在这里，通过高温合成，我们通过调节 Kagome 金属家族中的补偿亚铁磁性，发现了 4.95 kOe 的巨大 ZEB 场，这几乎是已知材料的两倍。原子尺度结构、自旋动力学和磁理论表明，这些补偿亚铁磁体源于由于过饱和优先锰掺杂而嵌入钬铁亚铁磁基体中的显着反铁磁交换相互作用。夹在铁磁铁戈薇双层之间的锰亚晶格的随机反铁磁顺序解释了这种非常规钉扎。本研究的结果概述了分层受阻系统中无序诱导的巨大 ZEB 和矫顽力。