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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Exchange bias and interface structure in the Ni/NiO nanogranular system
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Exchange bias and interface structure in the Ni/NiO nanogranular system

机译：Ni / NiO纳米颗粒体系中的交换偏压和界面结构

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摘要

The exchange bias ( EB) effect has been studied in Ni/NiO nanogranular samples obtained by annealing in H-2, at different temperatures ( 200 <= T-ann <= 300 degrees C), NiO powder previously ball-milled for 20 h. Typically, the samples consist of Ni nanoparticles ( mean size of 10 - 18 nm) embedded in a nanocrystalline NiO matrix. With increasing Tann, the Ni fraction varies from 4% up to 69%. The exchange field depends on the Ni amount, being maximum (similar to 600 Oe), at T = 5K, in the sample with 15% Ni. In all the samples, the EB effect vanishes at T = 200 K. The structural features of the samples have been investigated by x-ray diffraction, electron microscopy and extended x-ray absorption fine structure and the low-temperature magneto-thermal behaviour has been thoroughly analyzed. The results show the existence of a structurally and magnetically disordered NiO component, which plays the key role in the EB mechanism.
机译：在通过在不同温度下（200 <= T-ann <= 300℃）在H-2下退火得到的Ni / NiO纳米颗粒样品中，研究了交换偏斜（EB）效应，预先将NiO粉末球磨20 h 。通常，样品由嵌入纳米晶体NiO基质中的Ni纳米颗粒（平均尺寸为10-18 nm）组成。随着Tann的增加，Ni含量从4％到69％不等。交换场取决于Ni含量为15％的样品中T = 5K时的最大Ni含量（类似于600 Oe）。在所有样品中，EB效应在T = 200 K时都消失。通过X射线衍射，电子显微镜和扩展的X射线吸收精细结构研究了样品的结构特征，并且低温磁热行为具有经过彻底分析。结果表明存在结构和磁性无序的NiO组分，其在EB机理中起关键作用。

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