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Cooling-field dependence of dipole-induced loop bias

机译：偶极诱导环偏压的冷却场依赖性

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摘要

In ferromagnet/antiferromagnet bilayers and core/shell nanoparticles, an exchange-bias-like loop bias phenomenon in the ferromagnet is observed solely due to the long-range dipolar interactions between ferromagnet and antiferromagnet. With increasing cooling field, the loop bias field may increase from zero in the bilayers or from a negative value in the core/shell nanoparticles to a positive saturated value, depending on the interfacial dipolar interaction and/ or ferromagnetic/antiferromagnetic thickness. Using a modified Monte-Carlo method and the Meiklejohn-Bean model, the interfacial dipole fields (up to several teslas) and the domain sizes imprinted on the interfacial antiferromagnet are explicitly calculated to elucidate the cooling field dependence of loop bias, which is governed by distinct mechanisms at the flat and curved interfaces. Finally, through simply discussing the roles of lattice structure, ferromagnetic dipolar interaction, and simulation time, it is evidenced that the dipole-induced loop bias is ubiquitous and applicable for stabilizing a ferromagnet, irrespective of the interface mismatch and the undeterministic diffusion between different ingredients. This work helps us to develop the spintronic devices with nonatomic-contact-nanostructure assemblies.
机译：在铁磁性/反霉素双层和核心/壳纳米粒子中，仅由于铁圆环和反霉菌之间的远程双极相互作用而被观察到铁圆环中的交换偏置环偏置现象。随着冷却场的增加，环偏置场可以从双层中的零增加或从核/壳纳米颗粒中的负值增加到正饱和值，这取决于界面偶极相互作用和/或铁磁性/反铁磁性厚度。使用修改的Monte-Carlo方法和MeikleJohn-Bean模型，明确计算界面偶极谱图（最多几个Teslas）和印迹的域尺寸，以阐明循环偏置的冷却场依赖性，这是由扁平和弯曲接口处的独特机制。最后，通过简单地讨论晶格结构的作用，铁磁偶极相互作用和模拟时间，证明偶极诱导的环偏压普遍存在并且适用于稳定铁磁性，而不管界面不匹配和不同成分之间的未确定性扩散。这项工作有助于我们开发具有非attom-触点纳米结构组件的旋转反应器件。

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  • 来源
    《Nanotechnology》 |2019年第32期|共14页
  • 作者

    Hu Yong; Lu Qiang; Chi Xiaodan; Zhang Zibo; Hu Tianyi; Li Ruijun; Yu Le; Du An;

  • 作者单位

    Northeastern Univ Coll Sci Dept Phys Shenyang 110819 Liaoning Peoples R China;

    Northeastern Univ Coll Sci Dept Phys Shenyang 110819 Liaoning Peoples R China;

    Northeastern Univ Coll Sci Dept Phys Shenyang 110819 Liaoning Peoples R China;

    Northeastern Univ Coll Sci Dept Phys Shenyang 110819 Liaoning Peoples R China;

    Northeastern Univ Coll Sci Dept Phys Shenyang 110819 Liaoning Peoples R China;

    Northeastern Univ Coll Sci Dept Phys Shenyang 110819 Liaoning Peoples R China;

    Northeastern Univ Coll Sci Dept Phys Shenyang 110819 Liaoning Peoples R China;

    Northeastern Univ Coll Sci Dept Phys Shenyang 110819 Liaoning Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 特种结构材料;
  • 关键词

    nanostructure; dipolar interaction; cooling field; Monte-Carlo simulation;

    机译：纳米结构;偶极互动;冷却场;蒙特卡罗模拟;

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