Nano Archive

Arrays of ultrasmall metal rings

Singh, Deepak K. and Krotkov, Robert V. and Xiang, Hongqi and Xu, Ting and Russell, Thomas P. and Tuominen, Mark T. (2008) Arrays of ultrasmall metal rings. NANOTECHNOLOGY, 19 (24).

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In this paper, we present a simple method to fabricate ultra-high-density hexagonal arrays of ferromagnetic nanorings having 13 nm outer diameter, 5 nm inner diameter and 5 nm thickness. Cobalt magnetic nanorings were fabricated using a self-assembled diblock copolymer template with an angular evaporation of metal followed by an ion-beam etching. Magnetic measurements and theoretical calculations suggest that, at low fields, only the single domain and vortex states are important for rings of this size. The measured magnetization as a function of applied field shows a hysteresis that is consistent. These ultrasmall ferromagnetic rings have potential use in magnetic memory devices due to the simplicity of the preparation coupled with the ultra-high-density and geometry-controlled switching. This fabrication technique can be extended to other materials for applications in optics, sensing and nanoscale research.

Item Type:Article
Subjects:Material Science > Nanofabrication processes and tools
Physical Science > Nano objects
Physical Science > Nanomagnetics
ID Code:2383
Deposited By:Anuj Seth
Deposited On:17 Dec 2008 13:24
Last Modified:20 Jan 2009 10:32

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