Journal of the Vacuum Society of Japan
Online ISSN : 1882-4749
Print ISSN : 1882-2398
ISSN-L : 1882-2398
55 巻 , 9 号
選択された号の論文の11件中1~11を表示しています
小特集 1「東日本大震災の影響(その 2)―東北地区を中心として―」
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小特集 2「VACUUM2012―真空展」
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  • 永井 滋一, 畑 浩一, 岡田 守弘, 三村 秀典
    2012 年 55 巻 9 号 p. 430-436
    発行日: 2012年
    公開日: 2012/10/19
    ジャーナル フリー
      We observed the Verwey transition, metal-insulator transition, in a spin-polarization of field-emitted electrons from a topmost surface of a 〈110〉-oriented magnetite whisker by means of field-emitted electron polarimetry. Raising temperature of the whisker to about 120 K, the polarization of field-emitted electrons increased from 4 to 11% with a rotation of its direction. The rotation angle corresponds to a change of magnetic easy axis from 〈001〉 to 〈111〉 direction caused by the Verwey transition. At magnetite temperature of 40 K, the spin polarization was sensitive to increase of the applied field. Eventually, the direction of spin polarization reversed, which can not be explained taking in to account conventional free electron model. These results reveal that the Verwey transition occurs even at a surface as well as in a bulk and that the energy width and level of t2g band become narrower and lower than that of bulk.
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