Temperature and Emission Current Dependence on Spin Polarization of Field-Emitted Electrons from <110>-Oriented Magnetite Whisker

S. Nagai; K. Hata; M. Okada; H. Mimura

doi:10.1380/ejssnt.2010.321

Conference -ALC09-

Temperature and Emission Current Dependence on Spin Polarization of Field-Emitted Electrons from <110>-Oriented Magnetite Whisker

S. Nagai, K. Hata, M. Okada, H. Mimura

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Keywords: Field emission measurement, Field emission microscopy, Field emission, Iron oxide, Magnetic surface, Spin polarization, Magnetite, Verwey transition

JOURNAL FREE ACCESS

2010 Volume 8 Pages 321-324

DOI https://doi.org/10.1380/ejssnt.2010.321

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Abstract

We investigated the Verwey transition in field-emitted electrons from <110>-oriented magnetite whisker through the measurements of spin polarization. On temperature dependences varying tip voltage as a parameter from 850 V to 950 V, a rapid increase of spin polarization around 100 K due to the Verwey transition was observed more clearly with increase of applied voltage. This results indicates that t_2g band of Fe₃O₄ at surface becomes narrower and possesses lower energy than an ideal bulk state. [DOI: 10.1380/ejssnt.2010.321]

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