Verwey transition in field-emitted electrons from single 〈110〉-oriented magnetite whisker

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

doi:doi:10.1116/1.3325836

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

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J. Vac. Sci. Technol. B 28, C2A24 (2010); http://dx.doi.org/10.1116/1.3325836 (4 pages)

Verwey transition in field-emitted electrons from single 〈110〉-oriented magnetite whisker

Shigekazu Nagai¹, Koichi Hata¹, Morihiro Okada², and Hidenori Mimura²

¹Graduate School of Engineering, Mie University, 1577 Kurima-Machiya, Tsu 514-8507, Japan
²Research Institute of Electronics, Shizuoka University, 3-5-1 Johoku, Hamamatsu 432-8011, Japan

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(Published online 31 March 2010)

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The authors investigated the Verwey transition in field-emitted electrons from a 〈110〉-oriented magnetite whisker by means of temperature and emission-current-controlled spin-polarization measurements. Under a condition of total emission current of 1.5 nA, which is relatively high within the measured range, the spin polarization began to increase around 100 K due to the Verwey transition. At the low-temperature region, the spin polarization was sensitive to the emission current and the energy. Therefore, it is suggested that t_2g band of Fe₃O₄ at the surface becomes narrower and possesses lower energy than that in an ideal bulky condition.

ACKNOWLEDGMENTS

This work was supported by a Grant-in-Aid for Scientific Research (B), Grant No. 18360023, of the Japanese Ministry of Education, Culture, Sports, Science, and Technology. The authors thank K. Hiramatsu of Mie University for useful discussions.

Article Outline

INTRODUCTION
EXPERIMENT
RESULTS AND DISCUSSION
CONCLUSION

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KEYWORDS and PACS

Keywords

electron field emission, electron spin polarisation, ferromagnetic materials, metal-insulator transition, whiskers (crystal), magnetite, tungsten, spin polarized field emission

PACS

79.70.+q

Field emission, ionization, evaporation, and desorption
71.30.+h

Metal-insulator transitions and other electronic transitions
72.25.-b

Spin polarized transport
72.60.+g

Mixed conductivity and conductivity transitions

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History

Received 15 September 2009
Accepted 25 January 2010
Published online 31 March 2010

Digital Object Identifier

http://dx.doi.org/10.1116/1.3325836

PUBLICATION DATA

ISSN

1071-1023 (print)

1520-8567 (online)

Publisher

American Vacuum Society

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