Highly sensitive transport by merging different ordered states

2015 Fiscal Year Final Research Report

• Project/Area Number: 24540387
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Japan Atomic Energy Agency
• Principal Investigator: Mori Michiyasu 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 先端基礎研究センター, 研究主幹 (30396519)
• Co-Investigator(Kenkyū-buntansha): KOSHIBAE Wataru 国立研究開発法人理化学研究所, 創発物性科学研究センター, 上級研究員 (20273253)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Keywords: ジョセフソン効果 / 超伝導 / 強磁性 / シャピロステップ / 磁壁 / フィスケ共鳴

Outline of Final Research Achievements

We have studied the current-voltage (I-V) curve of a superconducting junction separated by a ferromagnet, in which a magnetic domain-wall oscillates. It is surprising that the I-V curve shows step-wise structures at voltages proportional to an oscillation frequency of the domain wall. Its coefficient is determined by fundamental constants, which are precisely determined. The voltage is also accurately measurable up to the 9th digit. Therefore, our equation shows that the oscillation frequency of the domain-wall is also precisely observable. Also in other cases as an oscillation of the width of domain-wall and the effect of device geometry, the I-V curve shows the similar changes.

Free Research Field

物性理論