La1.5Ba0.5CoMnO6 is a re-entrant cluster glass material exhibiting a robust negative exchange bias (EB) effect even after being cooled from an unmagnetized state down to low temperature in zero magnetic field. Here we thoroughly investigate this phenomena by performing magnetization as a function of applied field [M(H)] measurements at several different temperatures and maximum applied magnetic fields (Hm). The spontaneous EB (SEB) effect is observed below 20 K, and shows a maximum value for Hm = 75 kOe. The effect is greatly enhanced when the M(H) curves are measured after the system is cooled in the presence of a magnetic field. The asymmetry of the M(H) curves here investigated can be well described by a recently proposed model based on the unconventional relaxation of the SG-like moments during the hysteresis cycle.

中文翻译：

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La1.5Ba0.5CoMnO6 的自发交换偏置效应

La1.5Ba0.5CoMnO6 是一种重入簇状玻璃材料，即使在零磁场中从未磁化状态冷却到低温后，也表现出强大的负交换偏置 (EB) 效应。在这里，我们通过在几种不同的温度和最大外加磁场 (Hm) 下执行作为外加场 [M(H)] 测量函数的磁化来彻底研究这种现象。在 20 K 以下观察到自发 EB (SEB) 效应，并显示 Hm = 75 kOe 的最大值。当系统在存在磁场的情况下冷却后测量 M(H) 曲线时，效果会大大增强。这里研究的 M(H) 曲线的不对称性可以通过最近提出的模型很好地描述，该模型基于滞后循环期间类 SG 矩的非常规松弛。