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Magnetic quantification of single-crystalline Fe and Co nanowires via off-axis electron holography

机译：通过轴轴电子全息术单晶Fe和Co纳米线的磁定量

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摘要

Investigating the local micromagnetic structure of ferromagnetic nanowires (NWs) at the nanoscale is essential to study the structure-property relationships and can facilitate the design of nanostructures for technology applications. Herein, we synthesized high-quality iron and cobalt NWs and investigated the magnetic properties of these NWs using off-axis electron holography. The Fe NWs are about 100 nm in width and a few micrometers in length with a preferential growth direction of [100], while the Co NWs have a higher aspect-ratio with preferential crystal growth along the [110] direction. It is noted that compact passivation surface layers of oxides protect these NWs from further oxidation, even after nearly two years of exposure to ambient conditions; furthermore, these NWs display homogeneous ferromagnetism along their axial direction revealing the domination of shape anisotropy on magnetic behavior. Importantly, the average value of magnetic induction strengths of Fe NWs (2.07 {+/-} 0.10 T) and Co NWs (1.83 {+/-} 0.15 T) is measured to be very close to the respective theoretical value, and it shows that the surface oxide layers do not affect the magnetic moments in NWs. Our results provide a useful synthesis approach for the fabrication of single-crystalline, defect-free metal NWs and give insight into the micromagnetic properties in ferromagnetic NWs based on the transmission electron microscopy measurements.
机译：研究纳米尺度的铁磁纳米线（NWS）的局部微磁结构对于研究结构 - 性质关系是必不可少的，并且可以促进技术应用纳米结构的设计。在此，我们合成优质铁和钴NWS，并使用脱轴电子全全息检查这些NWS的磁性。 Fe NWS的宽度约为100nm，并且长度为几微米，优先的[100]的生长方向，而CoNWS具有沿[110]方向的优先晶体生长的较高纵横比。应注意，即使在接近两年的环境条件下近两年后，氧化物的紧凑型钝化表面层也可以通过进一步的氧化保护这些NW。此外，这些NWS沿着轴向显示均匀的铁磁性，揭示磁性行为的形状各向异性的统治。重要的是，Fe NWS磁感应强度的平均值（2.07 {+/-} 0.10t）和Co NWS（1.83 {+/-} 0.15t），以非常接近相应的理论值，并且显示表面氧化物层不会影响NWS中的磁矩。我们的结果提供了一种用于制备单晶，无缺陷金属NWS的有用的合成方法，并基于透射电子显微镜测量来欣赏到铁磁NW中的微磁特性。

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  • 来源
    《The Journal of Chemical Physics》 |2020年第11期|共8页
  • 作者

    Chai Ke; Li Zi-An; Huang Wenting; Richter Gunther; Liu Ruibin; Zou Bingsuo; Caron Jan; Kovacs Andras; Dunin-Borkowski Rafal E.; Li Jianqi;

  • 作者单位

    Beijing Inst Technol Sch Phys Beijing Key Lab Nano Photon &

    Ultrafine Optoelect Beijing 100081 Peoples R China;

    Chinese Acad Sci Beijing Natl Lab Condensed Matter Phys Beijing 100190 Peoples R China;

    Max Planck Inst Intelligent Syst Heisenbergstr 3 D-70569 Stuttgart Germany;

    Max Planck Inst Intelligent Syst Heisenbergstr 3 D-70569 Stuttgart Germany;

    Beijing Inst Technol Sch Phys Beijing Key Lab Nano Photon &

    Ultrafine Optoelect Beijing 100081 Peoples R China;

    Beijing Inst Technol Sch Phys Beijing Key Lab Nano Photon &

    Ultrafine Optoelect Beijing 100081 Peoples R China;

    Forschungszentrum Julich Ernst Ruska Ctr Microscopy &

    Spect Electrons D-52425 Julich Germany;

    Forschungszentrum Julich Ernst Ruska Ctr Microscopy &

    Spect Electrons D-52425 Julich Germany;

    Forschungszentrum Julich Ernst Ruska Ctr Microscopy &

    Spect Electrons D-52425 Julich Germany;

    Chinese Acad Sci Beijing Natl Lab Condensed Matter Phys Beijing 100190 Peoples R China;

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  • 正文语种 eng
  • 中图分类 物理化学（理论化学）、化学物理学;
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