Switching effects in superconductor/ferromagnet/superconductor graphene junctions  

作　　者：李晓薇 刘丹 鲍艳辉 

机构地区：[1]School of Physics and Electronic Electrical Engineering and Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials, Huaiyin Normal University [2]State Key Laboratory of Functional Materials for Informatics, (Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences) [3]School of Physics, Northeast Normal University

出　　处：《Chinese Physics B》2013年第12期456-460,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.11074088)

摘　　要：The Josephson effect in the superconductor/ferromagnet/superconductor （SFS） graphene Josephson junction is studied using the Dirac Bogoliubov-de Gennes （DBdG） formalism. It is shown that the SFS graphene junction drives 0–π transition with the increasing of p=h0L/vF？, which captures the effects of both the exchange field and the length of the junction; the spin-down current is dominant. The 0 state is stable for p 〈 pc （critical value pc ≈ 0.80） and the π state is stable for p 〉 pc, where the free energy minima are at φg=0 and φg=π, respectively. The coexistence of the 0 and π states appears in the vicinity of pc.The Josephson effect in the superconductor/ferromagnet/superconductor （SFS） graphene Josephson junction is studied using the Dirac Bogoliubov-de Gennes （DBdG） formalism. It is shown that the SFS graphene junction drives 0–π transition with the increasing of p=h0L/vF？, which captures the effects of both the exchange field and the length of the junction; the spin-down current is dominant. The 0 state is stable for p 〈 pc （critical value pc ≈ 0.80） and the π state is stable for p 〉 pc, where the free energy minima are at φg=0 and φg=π, respectively. The coexistence of the 0 and π states appears in the vicinity of pc.

关 键 词：superconductor junction grapheme switching effect 

分 类 号：TM26[一般工业技术—材料科学与工程]