2012 Fiscal Year Final Research Report

Study of introduction of asymmetry artificial pinning centers and improvement of superconducting characteristics for realization of superconducting rectifying device

Research Project

Project/Area Number	22560297
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	Electronic materials/Electric materials
Research Institution	Yamaguchi University
Principal Investigator	HARADA Naoyuki 山口大学, 大学院・理工学研究科, 准教授 (00222232)
Co-Investigator(Renkei-kenkyūsha)	ISHIBASHI Takayuki 長岡技術科学大学, 工学部, 准教授 (20272635)
Project Period (FY)	2010 – 2012
Keywords	超伝導 / 臨界電流 / 磁束ピンニング / 人工ピン / 非対称 / 微細加工 / Nb 膜
Research Abstract	When the current flow through a superconductor, the Lorentz forces will act on the vortices and make them move. The pinning centers are irregularly introduced into the superconductor, resulting in a symmetric pinning potential, which is not anisotropic according to the direction of the Lorentz force. If it is able to generate asymmetry in the pinning potential, it becomes possible to produce a superconductor with an anisotropic critical current density according to the flow direction of the current. Therefore the realizations of new rectifying superconducting devices are expected. In order to investigate the critical current properties for the superconducting device using asymmetric artificial pinning centers, triangle-shaped patterns were introduced as APCs in a 0.5-μm-thick Nb film by using a lithographic technique.