Abstract We have investigated the magnetization in a ferromagnetic/antiferromagnetic Co/NiO bilayer from room temperature (RT) to 200 °C. Using polar magneto-optical Kerr effect (PMOKE) based magnetometry, we observe the temperature-induced spin reorientation transition of the Co layer at 150 °C (from out-of-plane to in-plane state). Zero field cooling (ZFC) down to RT leads to the appearance of a micrometer size domain structure and demagnetization of the sample. The remanence magnetization after the ZFC process strongly depends on the temperature from which the cooling process starts (onset temperature). The domain structure and its evolution under the external out-of-plane magnetic field were studied with magnetic force and PMOKE microscopies.

中文翻译：

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超薄 Co/NiO 双层的退磁，产生由温度引起的磁各向异性变化控制的亚微米畴

摘要 我们研究了铁磁/反铁磁 Co/NiO 双层从室温 (RT) 到 200 °C 的磁化强度。使用基于极性磁光克尔效应 (PMOKE) 的磁力计，我们观察了 Co 层在 150 °C 时温度引起的自旋重定向转变（从面外状态到面内状态）。零场冷却 (ZFC) 降至 RT 会导致出现微米级域结构和样品退磁。ZFC 工艺后的剩磁很大程度上取决于冷却过程开始的温度（开始温度）。用磁力和PMOKE显微镜研究了在外部平面外磁场下的畴结构及其演变。