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首页> 外文期刊>Physical review >Spontaneous magnetization in the presence of nanoscale inhomogeneities in diluted magnetic systems
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Spontaneous magnetization in the presence of nanoscale inhomogeneities in diluted magnetic systems

机译：稀磁系统中存在纳米级不均匀性时的自发磁化

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摘要

The presence of nanoscale inhomogeneities has been experimentally evidenced in several diluted magnetic systems, which in turn often leads to interesting physical phenomena. However, a proper theoretical understanding of the underlying physics is lacking in most of the cases. Here, we present a detailed and comprehensive theoretical study of the effects of nanoscale inhomogeneities on the temperature-dependent spontaneous magnetization in diluted magnetic systems, which is found to exhibit an unusual and unconventional behavior. The effects of impurity clustering on the magnetization response have hardly been studied until now. We show that nanosized clusters of magnetic impurities can lead to drastic effects on the magnetization compared to that of homogeneously diluted compounds. The anomalous nature of the magnetization curves strongly depends on the relative concentration of the inhomogeneities as well as the effective range of the exchange interactions. In addition, we also provide a systematic discussion of the nature of the distributions of the local magnetizations.
机译：纳米级不均匀性的存在已在几种稀释的磁性系统中得到了实验证明，这反过来常常会引起有趣的物理现象。但是，在大多数情况下，都缺乏对基础物理学的正确理论理解。在这里，我们提出了对纳米稀疏性对稀磁系统中与温度有关的自发磁化强度的影响的详细而全面的理论研究，发现该异常表现出异常和非常规的行为。迄今为止，几乎没有研究杂质聚集对磁化响应的影响。我们表明，与均匀稀释的化合物相比，纳米级的磁性杂质簇可以对磁化强度产生巨大影响。磁化曲线的异常性质在很大程度上取决于不均匀性的相对浓度以及交换相互作用的有效范围。此外，我们还对局部磁化强度分布的性质进行了系统的讨论。

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  • 来源
    《Physical review》 |2012年第21期|214402.1-214402.8|共8页
  • 作者

    Akash Chakraborty; Paul Wenk; Richard Bouzerar; Georges Bouzerar;

  • 作者单位

    Institut fuer Theoretische Festkoerperphysik, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany,School of Engineering and Science, Jacobs University Bremen, Campus Ring 1, 28759 Bremen, Germany;

    Institut I - Theoretische Physik, Universitaet Regensburg, 93040 Regensburg, Germany;

    Institut Neel, CNRS, Departement MCBT, 25 avenue des Martyrs, B.P. 166, 38042 Grenoble Cedex 09, France;

    School of Engineering and Science, Jacobs University Bremen, Campus Ring 1, 28759 Bremen, Germany,Institut Neel, CNRS, Departement MCBT, 25 avenue des Martyrs, B.P. 166, 38042 Grenoble Cedex 09, France;

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  • 正文语种 eng
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  • 关键词

    magnetization curves, hysteresis, barkhausen and related effects; nanocrystals and nanoparticles; magnetic semiconductors;

    机译：磁化曲线;磁滞;巴克豪森及其相关影响;纳米晶体和纳米颗粒;磁性半导体;

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