| Budget Amount *help |
¥15,210,000 (Direct Cost: ¥11,700,000、Indirect Cost: ¥3,510,000)
Fiscal Year 2017: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2016: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000)
Fiscal Year 2015: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
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| Outline of Final Research Achievements |
This research aimed at realizing current-induced magnetic domain wall motion in ultra-narrow nanowires and three-dimensional pillar-shaped devices. First, the physical limit of miniaturization for the case of perpendicular-easy-axis wire was experimentally clarified to be around 20 nm and the underlying physics was revealed by micromagnetic simulation. Then, the research was shifted to the in-plane-easy-axis magnetic wire and a domain wall motion was demonstrated in wire with the width of 13 nm by applying a new concept. Finally, the pillar devices with the diameter of less than 10 nm and the thickness of 15 nm were fabricated and magnetization switching was experimentally investigated. The experimental results were well described by analytical model, and numerical simulation suggests the possibility of three-dimensional device when one design the thickness to be more than 30 nm. A large portion of the original objectives of this research were achieved.
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