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Achieving a high magnetization in sub-nanostructured magnetite films by spin-flipping of tetrahedral Fe3. cations

Nano Research 2015年第9期8卷 2935-2945页

作者： Tun Seng Herng Wen Xiao Sock Mui Poh Feizhou He Ronny Sutarto Xiaojian Zhu Runwei Li Xinmao Yin caozheng diao Yang Yang Xuelian Huang Xiaojiang Yu Yuan Ping Feng AndrivoRusydi Jun Ding Department of Materials Science and Engineering National University of Singapore 7 Engineering Drive I Singapore 119260 Singapore Singapore Synchrotron Light Source National University of Singapore 5 Research Link Singapore 117603 Singapore NUSNNI-Nanocore Department of Physics National University of Singapore 2 Science Drive 3 Singapore 117542 Singapore Department of Physics National University of Singapore 2 Science Drive 3 Singapore 117542 Singapore Canadian Light Source Saskatoon Saskatchewan S7N 2V3 Canada Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology and Engineering Ningbo 31520 I China

Magnetite Fe304 （ferrite） has attracted considerable interest for its exceptional physical properties： It is predicted to be a semimetallic ferromagnetic with a high Curie temperature, it displays a metal-insulator transition, and has potential oxide-electronics applications. Here, we fabricate a high-magnetization （〉 1 Tesla） high-resistance （-0.1 Ωcm） sub-nanostructured （grain size 〈 3 nm） Fe304 film via grain-size control and nano-engineering. We report a new phenomenon of spin- flipping of the valence-spin tetrahedral FeB＊ in the sub-nanostructured Fe304 film, which produces the high magnetization. Using soft X-ray magnetic circular dichroism and soft X-ray absorption, both at the Fe L3,2- and O K-edges, and supported by first-principles and charge-transfer multiple calculations, we observe an anomalous enhancement of double exchange, accompanied by a suppression of the superexchange interactions because of the spin-flipping mechanism via oxygen at the grain boundaries. Our result may open avenues for developing spin- manipulated giant magnetic Fe304-based compounds via nano-grain size control.

关键词： magnetite,X—ray magnetic circulardichroism(XMCD),giant magnetization,nanosuctured—Fe3O4,ferrite,spin—flipping

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Magnet Blocks Measurement for the Undulator ofNSRL Phase II Project

Magnet Blocks Measurement for the Undulator ofNSRL Phase II ...

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The Second Asian Particle Accelerator Conference

作者： Jia Qika Yao Chenggui Zhang shancai diao caozheng Xu Hongliang Lu MianlingNational Synchrotron Radiation Laboratory USTC

＜正＞ The magnetization strength of the permanent magnet blocks for the new undulator in NSRLPhase II Project is *** points measurement method using a Hall probe system is

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加深光学速调管自发辐射谱调制的研究

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高能物理与核物理 2000年第1期24卷 77-81页

作者：刘金英徐宏亮刁操政贾启卡何多慧中国科学技术大学近代物理系合肥230026

相干谐波储存环自由电子激光的相干增强因子正比于光学速调管自发辐射谱调制率的平方，加深光学速调管自发辐射谱的调制是相干谐波储存环自由电子激光研究的重要一环．介绍在中国科学技术大学８００ＭｅＶ电子储存环上所进行的加深光学... 详细信息

相干谐波储存环自由电子激光的相干增强因子正比于光学速调管自发辐射谱调制率的平方，加深光学速调管自发辐射谱的调制是相干谐波储存环自由电子激光研究的重要一环．介绍在中国科学技术大学８００ＭｅＶ电子储存环上所进行的加深光学速调管自发辐射谱调制的研究工作，调制率已从０．２３６提高到了０．８０，为相干谐波产生实验奠定了基础。

关键词：储存环自由电子激光光学速调管自发辐射谱调制

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