Longitudinal Magnetoresistance Effect of Single-Crystals of Blogen-Iron at Low Temperatures

概要

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With three kinds of single-crystal specimen of iron whose axes lie near three crystallographic principal axes, respectively, the change in electric resistance by longitudinal magnetization was measured up to 1200 oersteds at low temperatures ranging from -195°to 0℃. The specimens were cylindrical, 0.19〜0.21 cm in diameter and 11.3〜13.2 cm in length. The magnetoresistance curves were almost similar to one another in the temperature range of -123.3°〜0℃, that is, the magnetoresistance effect is increased noticeably by the rotational process of magnetic domain and approaches the saturation at the field for saturation magnetization. On the contrary, the magnetoresistance curves at -195℃ were different respectively from those at 0℃, that is, the negative magnetoresistance effect is observed at low fields in the specimens having [110] and [111], and at all fields in that having [100]. The saturation magnetoresistance effect vs. temperature curves in the directions of three crystallographic axes were nearly similar to one another in shape, being concave against the temperature axis. It is to be noted that in the cubic axis the magnetoresistance effect is zero at about -140℃ and becomes negative below this.
東北大学の論文