Abstract We investigate the magnetism and the electronic structure of body centred cubic, Fe 0.8 Ni 0.2 alloy. While the magnetic moment of pure Fe and the alloy in bcc phase are almost similar, the hysteresis loop exhibits soft magnetic behavior. Transport measurements exhibit hysteresis in cooling and heating cycles indicating possibilities of structural change in the alloy. Photoemission results exhibit signature of correlation induced effect in the core level spectra. The interaction parameters associated to the Ni electronic states are found to be influenced by the alloying presumably due to disorder induced effect. Fe 2 s core level spectra exhibit three distinct peaks due to exchange splitting and correlation of Fe 3 d electrons. The exchange splitting seems to remain unchanged in the temperature range studied in the alloy. Evidently, electron correlation and disorder is important to derive the complex electronic properties of this material. Our results establish that the magnetism and transport properties of Fe can be influenced significantly keeping the Fe moment unchanged via alloying with Ni, which is important for the applications of this material. Further studies are required to understand the resistivity anomaly and soft magnetism of this alloy.

中文翻译：

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bcc Fe0.8Ni0.2合金的交换相关性和磁性

摘要 我们研究了体心立方Fe 0.8 Ni 0.2 合金的磁性和电子结构。虽然纯 Fe 和 bcc 相合金的磁矩几乎相似，但磁滞回线表现出软磁行为。传输测量在冷却和加热循环中表现出滞后现象，表明合金结构变化的可能性。光电发射结果在核心能级光谱中表现出相关诱导效应的特征。发现与 Ni 电子态相关的相互作用参数受合金化的影响，这可能是由于无序诱导效应。由于交换分裂和 Fe 3 d 电子的相关性，Fe 2 s 核心能级光谱表现出三个不同的峰。在合金中研究的温度范围内，交换分裂似乎保持不变。显然，电子相关性和无序性对于推导出这种材料的复杂电子特性很重要。我们的结果表明，通过与 Ni 合金化，可以显着影响 Fe 的磁性和传输特性，保持 Fe 矩不变，这对于该材料的应用很重要。需要进一步研究以了解该合金的电阻率异常和软磁性。