Abstract We report the microstructural and magnetic characterization of single phase nanocrystalline partially inverted Zn0.3Ni0.7Fe2O4 mixed spinel ferrite. The samples were annealed at 200 °C, 400 °C, 600 °C, 800 °C and 1000 °C. X-ray diffraction results indicate phase purity of all the samples and application of Debye- Scherrer yielded a crystallite size variation from 5 nm to 33 nm for the different samples. Magnetic measurements have revealed the freezing of interfacial spins which were the cause of the large horizontal M-H loop shift causing large exchange bias with high anisotropy. The magnetic measurements show a hysteresis loop with high effective anisotropy constant due to highly magnetically disordered surface spin at 5 K.

中文翻译：

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单相 Zn 0.3 Ni 0.7 Fe 2 O 4 铁氧体纳米颗粒中尺寸相关的交换偏差

摘要 我们报告了单相纳米晶部分反转 Zn0.3Ni0.7Fe2O4 混合尖晶石铁氧体的显微结构和磁性表征。样品在 200 °C、400 °C、600 °C、800 °C 和 1000 °C 下退火。X 射线衍射结果表明所有样品的相纯度和 Debye-Scherrer 的应用对不同样品产生了从 5 nm 到 33 nm 的微晶尺寸变化。磁测量揭示了界面自旋的冻结，这是导致大水平 MH 环偏移的原因，导致具有高各向异性的大交换偏差。由于在 5 K 时高度磁无序的表面自旋，磁测量显示具有高效各向异性常数的磁滞回线。