Manipulation of vortex and anti-vortex states in small superconductors with antidots

2017 Fiscal Year Final Research Report

• Project/Area Number: 26287075
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: The University of Electro-Communications
• Principal Investigator: KOKUBO NOBUHITO 電気通信大学, 大学院情報理工学研究科, 准教授 (80372340)
• Co-Investigator(Kenkyū-buntansha): 岡安 悟 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 (50354824)
• Co-Investigator(Renkei-kenkyūsha): Nojima Tsutomu 東北大学, 金属材料研究所, 准教授 (80222199)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: 超伝導材料・素子 / 量子渦 / メゾスコピック系 / 走査プローブ顕微鏡 / 低温物性

Outline of Final Research Achievements

We have investigated vortex states confined in small squares of superconducting thin films with strategically introduced antidots. Scanning SQUID microscope images allow us to trace how vortices are trapped in antidots in different vorticities. We obtained several novel findings of (1) unique configurations of singly and multiply quantized vortices, (2) configurational symmetry and stability of the vortex states imposed with antidots, including interstitial vortices between antidots. We also manipulated the vortex states by utilizing the field history and the pinning effect in antidots and succeeded in visualizing vortex and antivortex clusters.

Free Research Field

数物系科学　物性II