Room Temperature Scanning Micro-Hall Probe Microscope Imaging of Ferromagnetic Microstructures Under Large Pulsed Magnetic Fields Generated by an Integrated Mini-Coil

集成微型线圈产生的大脉冲磁场下铁磁微结构的室温扫描微霍尔探针显微镜成像

• 批准号: 13650354
• 负责人: SANDHU Adarsh
• 金额: $ 2.11万
• 依托单位: TOKYO INSTITUTE OF TECHNOLOGY (2002)Tokai University (2001)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650354/
• 关键词: Hall Effect Device; Ferromagnetic materials; Domains; SHPM; Magnetic recording media; Permanent magnets; Pulsed magnetic fields; Magnetic hysteresis; 磁性体; 磁気記憶媒体; 強磁性体

A fundamental understanding of the behavior of magnetic domains in external magnetic fields is important for the development of information technology such as ultra-high density magnetic recording media, high coercivity permanent magnets and multilayered ferromagnetic structures used for fabricating novel 'spintronic' devices.In this research, a unique magnetic imaging system comprising of a room temperature scanning Hall probe microscope with an integrated mini-coil capable of generating pulsed magnetic fields up to 3 Tesla (width of 3.5ms) was developed for the direct and non-invasive magnetic imaging of ferromagnetic micro-domains in the presence of extremely large external pulsed magnetic fields without adverse vibrational disturbance of the sample during measurements. The system was successfully used for magnetic imaging of the erasure process of bit patterns on the surface of 1.4MB written floppy disks and the dynamics of micro-domain structures of demagnetized strontium ferrite permanent magnets under large external pulsed magnetic fields.The combined mini-coil/RT-SHPM system was demonstrated to be a valuable instrument for the direct, quantitative and non-invasive observation of localized stray magnetic fields at the surfaces of magnetic recording media and ferromagnetic materials in the presence large external bias fields.

对磁畴在外磁场中的行为的基本理解对于信息技术的发展是重要的，例如超高密度磁记录介质、高矫顽力永磁体和用于制造新型“自旋电子”器件的多层铁磁结构。独特的磁成像系统，包括一个室温扫描霍尔探针显微镜，带有一个集成的微型线圈，能够产生高达3特斯拉的脉冲磁场（宽度为3.5ms）被开发用于在存在非常大的外部脉冲磁场的情况下对铁磁微畴进行直接和非侵入性的磁成像，而在测量期间不会对样品产生不利的振动干扰。该系统已成功地用于1.4MB写入软盘表面位模式擦除过程的磁成像和强脉冲外磁场作用下退磁锶铁氧体永磁体微畴结构的动力学研究，证明了微型线圈/RT-SHPM组合系统是一种有价值的直接、在存在大的外部偏置场的情况下，对磁记录介质和铁磁材料的表面处的局部杂散磁场进行定量和非侵入性观察。

项目成果

A.Sandhu et.al: "Direct and Real-Time Observation of Sub-micron Domain Dynamics in Magnetically Biased Strontium Ferrite Permanent Magnetics by RT-SHPM"Proceedings of Materials Research Society,San Francisco April 17-20,2001,Symposium U. Symp.U(印刷中). (200

A.Sandhu 等人：“RT-SHPM 对磁偏置锶铁氧体永磁体中亚微米域动力学的直接和实时观察”材料研究学会论文集，旧金山，2001 年 4 月 17-20 日，研讨会 U. Symp.U（印刷中）（200）。

A.Sandhu et al.: "Room Temperature Scanning Hall Probe Microscopy using GaAs/AlGaAs and Bi Micro-Hall Probes"Ultramicroscopy. 91. 97-101 (2002)

A.Sandhu 等人：“使用 GaAs/AlGaAs 和 Bi 微型霍尔探针的室温扫描霍尔探针显微镜”超声显微镜。

A.Sandhu, H.Masuda, A.Oral, SJ.Bending, T.Inushima: Proceedings of the Eleventh International Workshop on the Physics of Semiconductor Devices,December 11-15,2001. Vol.2. 950-955 (2001)

A.Sandhu、H.Masuda、A.Oral、SJ.Bending、T.Inushima：第十一届半导体器件物理国际研讨会论文集，2001 年 12 月 11-15 日。

A.Sandhu et al.: "RT-SHPM Imaging of Garnet Films using New High Performance InSb Sensors"IEEE Transactions on Magnetics. 38. 2438-2440 (2002)

A.Sandhu 等人：“使用新型高性能 InSb 传感器对石榴石薄膜进行 RT-SHPM 成像”IEEE Transactions on Magnetics。

A.Sandhu et. al: "RT-SHPM Imaging of Garnet Films using New High Performance InSb Sensors"IEEE Transactions on Magnetics. 38. 2438-2440 (2002)

A.Sandhu 等。