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首页> 外文期刊>Physical review >MOKE experiments and theory of uniform and nonuniform distribution of magnetic nanoscrystals: Mn_5Ge-3 in Ge
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MOKE experiments and theory of uniform and nonuniform distribution of magnetic nanoscrystals: Mn_5Ge-3 in Ge

机译：磁性纳米晶体Mn_5Ge-3在Ge中均匀和非均匀分布的MOKE实验和理论

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摘要

We present a theoretical and experimental study of the magneto-optical (MO) Kerr effect (MOKE) on inhomogeneous systems. Starting from ab initio calculated band structures and using the effective medium approximation or the recently proposed alternating composition layers approximation [Phys. Rev. B 78, 134411 (2008)], we show that the complex Kerr angle can be reproduced also when a nonuniform distribution of the inhomogeneities is present. Applying our formalism to Mn-Ge-based systems, we find that a realistic account of the inhomogeneous concentration of Mn-rich precipitates in a Ge matrix is a necessary condition in order to describe, within the theoretical approach, the experimental Kerr spectra. The agreement between theoretical and measured MOKE spectra shows the validity of the model considered and establishes its predictive power also for a continuously varying concentration distribution of magnetic species in the system.
机译：我们提出了在非均匀系统上的磁光（MO）克尔效应（MOKE）的理论和实验研究。从头计算出的能带结构开始，并使用有效的介质近似值或最近提出的交替组成层近似值[Phys。 Rev. B 78，134411（2008）]，我们表明当存在非均匀性的不均匀分布时，也可以复制复杂的Kerr角。将我们的形式主义应用到基于Mn-Ge的系统中，我们发现对Ge基质中富Mn沉淀物的不均匀浓度的现实考虑是描述理论Kerr光谱的必要条件。理论和测得的MOKE谱之间的一致性表明了所考虑模型的有效性，并为系统中连续变化的磁性物质浓度分布建立了其预测能力。

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  • 来源
    《Physical review》 |2011年第22期|p.224421.1-224421.5|共5页
  • 作者

    Fabio Ricci; Franco DOrazio; Alessandra Continenza; Franco Lucari; Arthur J. Freeman;

  • 作者单位

    Dipartimento di Fisica, Universitd di L'Aquila, 1-67010 Coppito, L'Aquila, Italy,Consiglio Nazionale delle Ricerche-Istituto Nazionale di Fisica della Materia (CNR-SPIN) at Dipartimento di Fisica,Universitd di L'Aquila, 1-67010 Coppito, L'Aquila, Italy;

    Dipartimento di Fisica, Universitd di L'Aquila, 1-67010 Coppito, L'Aquila, Italy,Consorzio Nazionale Interuniversitario Scienze Fisiche della Materia (CNISM) at Dipartimento di Fisica,Universitd di L'Aquila, 1-67010 Coppito, L'Aquila, Italy;

    Dipartimento di Fisica, Universitd di L'Aquila, 1-67010 Coppito, L'Aquila, Italy,Consorzio Nazionale Interuniversitario Scienze Fisiche della Materia (CNISM) at Dipartimento di Fisica,Universitd di L'Aquila, 1-67010 Coppito, L'Aquila, Italy;

    Dipartimento di Fisica, Universitd di L'Aquila, 1-67010 Coppito, L'Aquila, Italy,Consiglio Nazionale delle Ricerche-Istituto Nazionale di Fisica della Materia (CNR-SPIN) at Dipartimento di Fisica,Universitd di L'Aquila, 1-67010 Coppito, L'Aquila, Italy;

    Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, USA;

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  • 正文语种 eng
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  • 关键词

    methods of electronic structure calculations; magnetooptical effects; fine-particle systems; nanocrystalline materials;

    机译：电子结构计算方法;磁光效应;细颗粒系统;纳米晶材料;

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