Fabrication of spin-polarized electron emitter with single 〈110〉-oriented magnetite whisker

Okada, Morihiro; Neo, Youichiro; Mimura, Hidenori; Nagai, Shigekazu; Hata, Koichi

doi:doi:10.1116/1.3356901

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Journal of Vacuum Science & Technology B / Volume 28 / Issue 2 / PAPERS FROM THE 22nd INTERNATIONAL VACUUM NANOELECTRONICS CONFERENCE / Fabrication

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J. Vac. Sci. Technol. B 28, C2C26 (2010); http://dx.doi.org/10.1116/1.3356901 (5 pages)

Fabrication of spin-polarized electron emitter with single 〈110〉-oriented magnetite whisker

Morihiro Okada¹, Youichiro Neo¹, Hidenori Mimura¹, Shigekazu Nagai², and Koichi Hata²

¹Research Institute of Electronics, Shizuoka University, Hamamatsu, Shizuoka 432-8011, Japan
²Graduate School of Engineering, Mie University, Tsu, Mie 514-8507, Japan

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(Published online 30 March 2010)

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Magnetite (Fe₃O₄) is oxidative resistant and has a half metallic property and is expected to have spintronic applications. In this work, 〈110〉-oriented single crystal magnetite whiskers, 30–300 nm in diameter, were synthesized on a stainless steel plate by means of the combustion flame thermal oxidation process. An electron source with this single magnetite whisker was fabricated by using a microsampling instrument in a focused ion beam system. The spin polarization of the electron source was found to be 15% at room temperature by using a Mott electron polarimeter.

ACKNOWLEDGMENTS

The authors wish to thank K. Kubomura of Kanazawa Institute of Technology for providing the samples. This work was supported in part by Grant-in-Aid for Scientific Research (C) (Grant No. 21510113) from the Ministry of Education, Culture, Sports, Science and Technology, Japan.

Article Outline

INTRODUCTION
EXPERIMENT
1. Growth of whiskers and their analyses
2. Microsampling
3. Measurements of spin polarization
RESULTS AND DISCUSSION
1. Growth of whiskers and their analyses
2. Microsampling and electron source fabrication
3. Measurements of spin polarization
CONCLUSIONS

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KEYWORDS and PACS

Keywords

combustion synthesis, electron sources, ferromagnetic materials, focused ion beam technology, iron compounds, nanofabrication, nanostructured materials, spin polarised electron emission, whiskers (crystal)

PACS

07.77.Ka

Charged-particle beam sources and detectors
61.46.-w

Structure of nanoscale materials
68.70.+w

Whiskers and dendrites (growth, structure, and nonelectronic properties)
81.16.Be

Chemical synthesis methods
82.33.Vx

Reactions in flames, combustion, and explosions

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History

Received 29 September 2009
Accepted 1 February 2010
Published online 30 March 2010

Digital Object Identifier

http://dx.doi.org/10.1116/1.3356901

PUBLICATION DATA

ISSN

1071-1023 (print)

1520-8567 (online)

Publisher

American Vacuum Society

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