Magnetotransport properties of CrO2 powder composites (Review article)
Magnetotransport properties of CrO2 powder composites (Review article)
复制标题
CrO2 粉末复合材料的磁输运特性（综述文章）
DOI：
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Y. Kolesnichenko
中科院分区：
文献类型：
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作者：
E. Beliayev;V. A. Horielyi;Y. Kolesnichenko
根据二氧化铬基复合材料对现代认识无序磁性体系中电子输运现象的发展的影响，给出了最重要的实验结果和理论概念。结果表明，粉末材料中发生的各种物理过程不允许发展一种整体的理论方法来描述所获得的压实材料的性能。复合材料的性能取决于组成它们的颗粒的形状和磁性的各向异性。渗流效应的影响导致载流通道的形态随外磁场中温度的变化而变化。这既影响磁阻磁滞回线的形状，也影响与磁阻最大值对应的磁场大小。在半金属复合材料中观察到的广泛的磁输运现象有助于发展关于金属-绝缘体阈值附近的电导特性以及金属-绝缘体界面对隧道电导的影响的现代概念。
The most significant experimental results and theoretical concepts related to chromium dioxide-based composites, according to their influence on the evolution of modern understanding of electron transport phenomena in disordered magnetic systems, are presented. It is shown that the variety of physical processes taking place in powder materials does not allow the development of a holistic theoretical approach to describing the properties of the obtained compacted materials. The properties of composite materials depend on the anisotropy of the shape and magnetic properties of particles of which they are composed. The influence of percolation effects leads to a change in the current-carrying channels morphology with the temperature variation in an external magnetic field. This affects both the shape of the magnetoresistance hysteresis loops and the magnetic field magnitudes corresponding to the magnetoresistance maxima. A wide range of magnetotransport phenomena observed in half-metal composite materials contributes to the development of modern concepts of the conductivity features near the metal-insulator threshold and the influence of the metal-insulator interfaces on tunneling conductivity.