大阪大学 · 物理学・天文学
東野徹雄教授の研究室では、ナノスケールにおける磁気的性質と電気的輸送の相関を解明するため、磁性ナノワイヤーや磁壁の制御を核とした新規スピンデバイスの創出をめざしています。特に、磁壁の形成とその動きが電子のスピンに与える影響を、巨視的磁気抵抗効果や量子化伝導度の観測によって解明しています。この研究は、次世代のナノスケールセンサーやメモリデバイスの開発に貢献する基盤を提供しています。
Figures are computed from collected data and may differ slightly.
The motion of a magnetic domain wall in a submicrometer magnetic wire was detected by use of the giant magnetoresistance effect. Magnetization reversal in a submicrometer magnetic wire takes place by the propagation of a magnetic domain wall, which can be treated as a "particle." The propagation velocity of the magnetic domain wall was determined as a function of the applied magnetic field.
The microsomal enzyme system from rat liver which catalyzes squalene epoxidation requires a supernatant protein and phospholipids (Tai, H., and Bloch, K. (1972) J. Biol. Chem. 247, 3767). It has now been found that these two cytoplasmic components can be replaced by Triton X-100. The same detergent solubilizes the microsomal squalene epoxidase and the resulting supernatant can be separated into two components, A and B, by DEAE-cellulose chromatography. Neither Fraction A nor B alone has signific
We demonstrate the electrical conductance quantization in a Ni nanowire formed in a break junction between a ferromagnetic Ni wire and a Ni plate in applied magnetic fields. The conductance of the nanowire is clearly quantized in units of 2e2/h in a zero magnetic field, but it is switched to e2/h by applying magnetic fields above 60 Oe. This switching behavior seems closely related to a ferromagnetic domain formation in the vicinity of a nanowire, suggesting that nanoscale magnetic domain walls
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