Near-field Magneto-optical Microscope for Observation of Nano-spin Structure

用于观察纳米自旋结构的近场磁光显微镜

• 批准号: 07555099
• 负责人: SATO Katsuaki
• 金额: $ 10.5万
• 依托单位: Tokyo University of Agriculture and Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555099/
• 关键词: SNOM; near-field optics; magneto-optical microscopy; bent fiber probe; polarization transmittion; photoelastic modulator; focused ion beam; micro magnetic pattern of cobalt; 近視場顕微鏡; 偏光変調法; ファイバープローブ; プラチナコバルト人工格子; 光磁気記録; 微細磁性パターン; エバネセント光

This report describes the research and development of a scanning near-field magneto-optical microscope conducted under the support of Grant-in-Aid for Scientific Research from the Ministry of Education, Science, Sports and Culture (Category No.07555099).Recently the rapid development in the nano-fabrication technique has lead to the realization of magnetic materials with a sub micron structure, which requires development of observation technology for the Sub-micron to nanometer region. There have been studied various observation techniques such as the magnetic force microscopy (MFM), the electron beam holography (EBH), and the spin-polarized scanning electron microscope (SPSEM). Although MFM and EBH provide ample information on the magnetic field around the magnetic materials, they do not give information of the sample magnetization directly.SPSEM is an excellent technique to observe the spin polarization of the surface directly, it still requires much fundamental studies in order to g … More et a position as a versatile measuring technique, since it is too sesitive to the surface condition of the sample. Compared with these sorts of microscopy the scanning near-field optical microscopy (SNOM) can provide direct information of the magnetization in the material itself.First we took attention on the polarization transmission properties in the bent-fiber probe, which simultaneously work as a cantilever for AFM in the system we employed. It is found that careful selection of the fiber-probe and optimization of the compensating optics can provide a good polarization characteristics. Using the fiber probe with optimized optics we successfully observed magneto-optical-images of the recorded marks on a MO disc with the dysprosium iron garnet film under the crosspolarizer configuration.Next in order to increase sensitivity of the magneto-optical signal we introduced the polarization-modulation technique using the photoelastic modulator (PEM). We successfully obtained the chevron-shaped marks on the platinum/cobalt disk with submicron length. The resolution attained was 90nm.We prepared microstructures of cobalt with sub-mirometer size using focused ion beam (FIB) technology. We obtained magneto-optical images of the microstructure. It is confirmed that the microstructure can be used as a standard pattern for the magneto-optical SNOM. Less

本文介绍了在文部科学研究助学金(批准号：07555099)的支持下研制的扫描近场磁光显微镜。近年来，纳米制造技术的快速发展导致了亚微米结构磁性材料的实现，这就要求亚微米到纳米区域的观察技术的发展。人们已经研究了各种观察技术，如磁力显微镜(MFM)、电子束全息术(EBH)和自旋极化扫描电子显微镜(SPSEM)。虽然磁力显微镜和电子轰击能提供关于磁性材料周围磁场的丰富信息，但它们不能直接给出样品的磁化强度信息。表面扫描电子显微镜是一种直接观察表面自旋极化的优秀技术，但要想进行…，还需要进行大量的基础研究由于它对样品的表面条件过于敏感，因此将其作为一种通用的测量技术。与这些类型的显微镜相比，扫描近场光学显微镜(SNOM)可以直接提供材料本身的磁化信息。首先，我们关注了弯曲光纤探头中的偏振传输特性，在我们所采用的系统中，弯曲光纤探头同时作为AFM的悬臂。研究发现，仔细选择光纤探头和优化补偿光学元件可以提供良好的偏振特性。利用优化后的光纤探头，在交叉偏振器配置下，成功地观测到了含镝铁石榴石薄膜的磁光光盘上记录标记的磁光图像。其次，为了提高磁光信号的灵敏度，我们引入了利用光弹调制器(PEM)的偏振调制技术。我们成功地在亚微米长的铂/钴圆盘上获得了人字形的痕迹。利用聚焦离子束(FIB)技术制备了亚微米尺寸的钴微结构。我们获得了微结构的磁光图像。结果表明，该微结构可以作为磁光近场光学显微镜的标准图形。较少

项目成果

光岡靖幸、中島邦雄、村松宏、安宅龍明、戸谷聡、佐藤勝昭: "SNOAMによる偏光像の観察" 第57回応用物理学会学術講演会予稿集(7pA7)1996.9.7-10. 778- (1996)

Yasuyuki Mitsuoka、Kunio Nakajima、Hiroshi Muramatsu、Tatsuaki Ataka、Satoshi Totani、Katsuaki Sato：“SNOAM 偏振图像观察”日本应用物理学会第 57 届年会记录 (7pA7) 1996.9.7-10。 (1996)

N.Chiba,K.Nakajima,et al.: "Resolution of an optical image of a scanning near-field optical/atomic force microscope as a function of sample-probe distance during synchronized irradiation" Thin Solid Films. (in press). (1996)

N.Chiba、K.Nakajima 等人：“扫描近场光学/原子力显微镜的光学图像分辨率与同步照射期间样品-探针距离的函数关系”固体薄膜。

T.Ishibashi, T.Yoshida, J.Yamamoto, K.Sato, Y.Mitsuoka and K.Nakajima: "Magneto-optical imaging by Scanning near-field optical microscope using polarization modulation technique:" J.Magn.Soc.Jpn.22(刊行予定). (1998)

T.Ishibashi、T.Yoshida、J.Yamamoto、K.Sato、Y.Mitsuoka 和 K.Nakajima：“使用偏振调制技术通过扫描近场光学显微镜进行磁光成像：”J.Magn.Soc.Jpn。 22（待出版）（1998）。

光岡靖幸、中島邦雄、村松宏、安宅龍明、戸谷聡、佐藤勝昭: "SNOAMによる偏光像の観察" 第57回応用物理学会学術講演会予稿集(7pA7)1996.9.7-10. 778 (1996)

Yasuyuki Mitsuoka、Kunio Nakajima、Hiroshi Muramatsu、Tatsuaki Ataka、Satoshi Totani、Katsuaki Sato：“SNOAM 偏振图像的观察”日本应用物理学会第 57 届年会记录 (7pA7) 1996.9.7-10 (778) 1996))

Y.Mitsuoka, K.Nagamine, K.Homma, N.Chiba, H.Muramatsu and T.Ataka and K.Sato: "Polarization characteristics andimaging in scanning near-field optical/atomic-force microscopy" Digest 15th Int.Colloquium Magnetic Films and Surfaces (ICMFS15),Sunshine Coast,

Y.Mitsuoka、K.Nagamine、K.Homma、N.Chiba、H.Muramatsu 和 T.Ataka 和 K.Sato：“扫描近场光学/原子力显微镜中的偏振特性和成像”摘要第 15 届 Int.Colloquium Magnetic