Vortex ratchet reversal: Role of interstitial vortices

被引：23

作者：

de Lara, D. Perez ^{[1
,3
]}

Erekhinsky, M. ^{[2
]}

Gonzalez, E. M. ^{[3
]}

Rosen, Y. J. ^{[2
]}

Schuller, Ivan K. ^{[2
]}

Vicent, J. L. ^{[1
,3
]}

机构：

[1] IMDEA Nanociencia, E-28049 Madrid, Spain

[2] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

[3] Univ Complutense, Dept Fis Mat, E-28040 Madrid, Spain

来源：

PHYSICAL REVIEW B | 2011年 / 83卷 / 17期

基金：

美国国家科学基金会;

关键词：

TRANSPORT;

D O I：

10.1103/PhysRevB.83.174507

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Triangular arrays of Ni nanotriangles embedded in superconducting Nb films exhibit unexpected dynamical vortex effects. Collective pinning with a vortex-lattice configuration different from the expected fundamental triangular "Abrikosov state" is found. The vortex motion, which prevails against the triangular periodic potential, is produced by channeling effects between triangles. Interstitial vortices coexisting with pinned vortices in this asymmetric potential lead to ratchet reversal, i.e., a dc output voltage that changes sign with the amplitude of an applied alternating drive current. In this landscape, ratchet reversal is always observed at all magnetic fields (all numbers of vortices) and at different temperatures. The ratchet reversal is unambiguously connected to the presence of two locations for the vortices: interstitial and above the artificial pinning sites.

引用

页数：5

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