Three-dimensional analysis of magnetization distribution by MFM and electron holography

利用 MFM 和电子全息术三维分析磁化强度分布

• 批准号: 16206011
• 负责人: SHINDO Daisuke
• 金额: $ 32.12万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16206011/
• 关键词: electron holography; magnetic flux; magnetization; magnetic force microscopy; magnetic recording; 集束イオンビーム法; 斜方蒸着テープ; 記録媒体; 磁化分布; 漏洩磁場

The aim of this research project is to develop a new technique that reveals a magnetization distribution in three-dimension and its application to nanostructured magnetic materials. Electron holography is combined with MFM (magnetic force microscopy) in ordered to observe both the in-plane component of magnetic flux and the stray magnetic field that is approximately perpendicular to the foil plane of the specimen.As an achievement in this project, we have established a computer simulation technique, by which a holographic result (i.e., information of magnetic flux) can be converted to a magnetization distribution in a thin-foiled specimen. MFM observations were conducted for the same specimen as that of the holography study ; therefore, the magnetization distribution was revealed in three-dimension. In fact the devised method was applied to magnetic recording systems and other magnetic materials. We have also developed a unique method to apply a magnetic field by using a sharpened magnetic needle-the needle produces a magnetic field near 1T, which is large enough for performing in situ observations of a magnetization process within a transmission electron microscope. Many important results were obtained within the research period, and they were published in major journals such as Phys.Rev.Lett., Appl.Phys.Lett., J.Appl.Phys., etc.

本研究计划的目的是发展一种新的技术，揭示三维磁化分布及其应用于纳米结构磁性材料。将电子全息术与磁力显微术相结合，可以同时观察面内磁通分量和近似垂直于样品箔面的杂散磁场，作为本课题的一项成果，我们建立了一种计算机模拟技术，通过该技术可以得到全息结果（即，磁通量的信息）可以被转换为薄箔样品中的磁化分布。MFM观测进行了相同的标本的全息研究，因此，磁化强度分布在三维显示。事实上，设计的方法被应用于磁记录系统和其他磁性材料。我们还开发了一种独特的方法，通过使用尖锐的磁针施加磁场-磁针产生近1 T的磁场，这是足够大的，用于在透射电子显微镜内进行原位观察的磁化过程。在研究期间取得了许多重要成果，并发表在主要期刊上，如Phys. Rev. Lett.，Appl.Phys.Lett.，应用物理学杂志，等

项目成果

Magnetic microstructures of nano-granular CoPt-Al-O thin films studied by Lorentz microscopy and electron holography

洛伦兹显微镜和电子全息术研究纳米颗粒CoPt-Al-O薄膜的磁性微结构

• 发表时间: 2005
• 期刊: IEEE Transactions on Magnetics 41(10)
• 作者: Y. Miura;et. al.;M. Shibuya ed. al.;中島 隆芳;H.S.Park
• 通讯作者: H.S.Park

Characterization of DLC films by EELS and electron holography

通过 EELS 和电子全息术表征 DLC 薄膜

• 发表时间: 2005
• 期刊: Journal of Electron Microscopy 54(1)
• 作者: S. Kasahara;K. Asamura;T. Mukai;Hyun Soon Park;S.Y.Ji;Daisuke Shindo
• 通讯作者: Daisuke Shindo

Three dimensional magnetic resonance imaging by magnetic resonance force microscopy with a sharp magnetic needle

使用锋利磁针的磁共振力显微镜进行三维磁共振成像

• 发表时间: 2006
• 期刊: J. Magnetic Resonance 178
• 作者: S.Tsuji;et al.
• 通讯作者: et al.

Simultaneous measurements of conductivity and magnetism by using microprobes and electron holography

使用微探针和电子全息术同时测量电导率和磁性

• 发表时间: 2006
• 期刊: Appl. Phys. Lett. 88
• 作者: Y. Yasui;et. al.;F. Xue;M.Yamashita et al.;T. Kawasaki;T. Okamoto;Y. Khajuria;Y.Murakami et al.
• 通讯作者: Y.Murakami et al.

Lorentz microscopy and holography characterization of magnetic materials, Handbook of Advanced Magnetic Materials

磁性材料的洛伦兹显微镜和全息表征，先进磁性材料手册

• 发表时间: 2006
• 作者: M.Nagase;K.Nakamatsu;S.Matsui;H.Namatsu;H.Yamaguchi;D.Shindo et al.
• 通讯作者: D.Shindo et al.