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Interplay between particle anisotropy and exchange interaction in Fe nanoparticle films

机译:铁纳米颗粒薄膜中颗粒各向异性与交换相互作用之间的相互作用

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摘要

The magnetic properties of Fe nanoparticles films were investigated by magnetization measurements and Monte Carlo simulations. The films were produced by femtosecond pulsed laser deposition assisted by irradiation of nanoparticles with a nanosecond UV laser pulse, appropriately delayed, during their flight from the target to the substrate. The films consist of nanoparticles with a disklike shape. The initial magnetization curve exhibits a stepwise behavior, characterized by a reversible plateau followed by rapid irreversible increments. The observed behavior, induced by the peculiar nanoparticle film morphology, is the result of the competition between particle anisotropy, dipole-dipole interactions, and interparticle exchange coupling. This picture is supported by Monte Carlo simulations, satisfactorily reproducing the experimental observations.
机译:通过磁化测量和蒙特卡洛模拟研究了铁纳米颗粒薄膜的磁性。薄膜是通过飞秒脉冲激光沉积生产的,该薄膜在纳米颗粒从靶材飞向基材的过程中,以纳秒级的UV激光脉冲(适当延迟)照射了纳米颗粒,从而得到了辅助。膜由具有盘状形状的纳米颗粒组成。初始磁化曲线表现出逐步的行为,其特征在于可逆的平稳期,随后是快速不可逆的增量。由特殊的纳米颗粒薄膜形态引起的观察到的行为是颗粒各向异性,偶极-偶极相互作用和颗粒间交换耦合之间竞争的结果。这张照片得到了蒙特卡洛模拟的支持,令人满意地再现了实验观察结果。

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  • 来源
    《Physical review》 |2011年第21期|p.214422.1-214422.5|共5页
  • 作者单位

    CNR-SPIN and Department of Physical Sciences, Naples University "Federico II," p.le V. Tecchio 80, 1-80125 Napoli, Italy;

    CNR-SPIN and Department of Physical Sciences, Naples University "Federico II," p.le V. Tecchio 80, 1-80125 Napoli, Italy;

    CNR-SPIN and Department of Physical Sciences, Naples University "Federico II," p.le V. Tecchio 80, 1-80125 Napoli, Italy;

    CNR-SPIN and Department of Physical Sciences, Naples University "Federico II," p.le V. Tecchio 80, 1-80125 Napoli, Italy;

    CNR-SPIN and Department of Physical Sciences, Naples University "Federico II," p.le V. Tecchio 80, 1-80125 Napoli, Italy;

    Nanobiotechnology Facilities-Istituto Italiano di Tecnologia (IIT), Via Morego 301-16163 Genova, Italy;

    Institute of'Materials Science, NCSR "Demokritos," Aghia Paraskevi, 15310 Athens, Greece;

    Institute of'Materials Science, NCSR "Demokritos," Aghia Paraskevi, 15310 Athens, Greece;

    ISM-CNR, Area delta Ricerca, Romal, Via Solaria km 29.300, C.P. 10, 00016 Monterotondo Scalo (RM), Italy;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    magnetic anisotropy; fine-particle systems; nanocrystalline materials;

    机译:磁各向异性细颗粒系统;纳米晶材料;

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