Browsing by Author "Zhou, R"

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    Colossal zero-field-cooled exchange bias via tuning compensated ferrimagnetic in kagome metals
    (American Chemical Society, 2024-07-22) Zhou, H; Cao, Y; Khmelevskyi, S; Zhang, Q; Hu, S; Avdeev, M; Wang, CW; Zhou, R; Yu, C; Chen, X; Li, Q; Miao, J; Li, Q; Lin, K; Xing, XR
    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. © 2024 American Chemical Society.