Exchange bias is a property of widespread technological utility, but its underlying mechanism remains elusive, in part because it is rooted in the interaction of coexisting order parameters in the presence of complex magnetic disorder. Here we show that a giant exchange bias housed within a spin-glass phase arises in a disordered antiferromagnet. The magnitude and robustness of the exchange bias emerges from a convolution of two energetic landscapes, namely the highly degenerate landscape of the spin glass biased by the sublattice spin configuration of the antiferromagnet. The former provides a source of uncompensated moment, whereas the latter provides a mechanism for its pinning, which leads to the exchange bias. Tuning the relative strengths of the spin-glass and antiferromagnetic order parameters reveals a principle for tailoring the exchange bias, with potential applications to spintronic technologies.

交换偏差是一种广泛的技术实用性，但其潜在机制仍然难以捉摸，部分原因是它植根于复杂磁无序存在下共存有序参数的相互作用。在这里，我们展示了在无序反铁磁体中产生的自旋玻璃相中的巨大交换偏差。交换偏差的大小和稳健性来自两个能量景观的卷积，即由反铁磁体的亚晶格自旋配置偏置的自旋玻璃的高度简并景观。前者提供了无补偿力矩的来源，而后者提供了一种固定机制，这导致了交换偏差。