Superconducting anti-dot arrays from self-assembly template methods

Abstract

We present results of electrochemical deposition of superconducting Pb in the pores of templates prepared by self-assembly from colloidal suspensions of polystyrene latex spheres. This technique enables us to create highly ordered superconducting nano-structures with 3D architectures on length scales ranging from 50 - 1000 nm. The prepared samples show pronounced Little-Parks oscillations in Tc and matching effects in magnetization and magnetic susceptibility. Real and imaginary parts of susceptibility follow a universal Cole-Cole curve. Self-field effects play an important role in commensurability behaviour of magnetic moment at low temperatures.Comment: 12 pages, 6 figure

Microscopic picture of the critical state in a superconductor with a periodic array of antidots

“…17 Because H p increases as T decreases, this situation is experimentally achieved at temperatures not very close to the critical temperature, and this explains the lack of matching features in global magnetization measurements at low T . 18,19 In Ref. 16 the authors considered the case that H p < H 1 , and show that local enhancement of the magnetization occurs slightly above the exact matching field as a result of the flux gradient.…”

Self-assembly Routes towards Creating Superconducting and Magnetic Arrays

“…As can be seen from Fig. 6a the acsusceptibility measurements also reveal commensurability oscillations in the pinning strength 13 . In a wide temperature range sharp peaks are observed near the commensurate points.…”

“…This technique offers new opportunities, which are not easily realized by standard lithographic methods, and allows us to create magnetic nano-structures with 3D architectures on a broad range of length scales, 20 -2000 nm. In this paper we briefly review our previous results [5][6][7][8][9][10][11][12][13] and in more detail describe some recent observations. We show that the 3D architecture of these structures produces many unique properties absent in nanostructures prepared by conventional lithographical techniques.…”

Fabrication of PZT nano dot array and their ferroelectric properties

“…Self-assembly is one of the typical ''bottom-up'' methods, and has been used to prepare dot array (Zhukov et al 2004), quantum nanowires, nano-shell tubes (Stefanita et al 2004;Luo et al 2003;Ren et al 2009;Lee et al 2008). In this method, a key process is to obtain the template, which is usually fabricated by other techniques, for example the EBDW.…”