We study electronic transport properties of ferromagnetic nanoparticle arrays and nanodomain materials near the Curie temperature in the limit of weak coupling between the grains. We calculate the conductivity in the Ohmic and non-Ohmic regimes and estimate the magnetoresistance jump in the resistivity at the transition temperature. The results are applicable for many emerging materials, including artificially self-assembled nanoparticle arrays and a certain class of manganites, where localization effects within the clusters can be neglected.
从铁磁相的自旋无序散射出发，进一步引入限制条件，导出了电阻率随温度和电离能（掺杂）的变化模型。磁化和极化效应捕获自旋独立和自旋辅助的铁磁体的电荷输运机制，包括新报道的Mn $_x$ Ge $_{1-x}$铁磁半导体。计算得到的Ga-$_{1-x}$-Mn-$_x$-As体系的$T_C$以下的$T_{crossover}$和载流子密度分别为8-12 K和10 $^{19}$-cm-$^{-3}$，与10-12 K和10 $^{18}-10^{20}$-cm-$^{-3}$的实验值非常吻合。计算得到Mn $_x$ Ge $_{1-x}$的载流子密度为10 $^{19}$ cm $^{-3}$，与实验值在同一数量级.
Observation of correlation-driven topological transport and robust ferromagnetism in 2D CrS$_2$
Institute of Physics（物理研究所）；S. N. Bose National Centre for Basic Sciences（S.N. 玻色基础科学国家中心）；Uppsala University（乌普萨拉大学）；Montanuniversität Leoben（莱奥本矿业大学）；University of Rijeka（里耶卡大学）
Spontaneous nonreciprocal transport in a gate-tunable ferromagnetic Rashba 2-dimensional electron gas
Laboratoire Albert Fert, CNRS, Thales, Université Paris-Saclay（阿尔贝·费尔特实验室，法国国家科学研究中心，泰雷兹集团，巴黎萨克雷大学）；Helmholtz-Zentrum Berlin（柏林赫尔姆霍兹中心）；Institut für Physik, Martin-Luther-Universität, Halle-Wittenberg（马丁·路德哈勒-维滕贝格大学物理研究所）；Plateforme Mesures Physiques à Basses Températures, Sorbonne Université（索邦大学低温测量平台）；Saha Institute of Nuclear Physics（萨哈核物理研究所）；Max Planck Institute of Microstructure Physics（马克斯·普朗克微结构物理研究所）
Skyrmionic Transport and First Order Phase Transitions in Twisted Bilayer Graphene Quantum Hall Ferromagnet
Indian Institute of Technology, Kharagpur（印度理工学院哈格普尔分校）；S. N. Bose National Centre for Basic Sciences（S.N.玻色基础科学国家中心）；National Institute for Materials Science（日本国立材料研究所）
