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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Official URL: http://www.iop.org/EJ/abstract/0957-4484/19/24/245...
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.
|Subjects:||Material Science > Nanofabrication processes and tools|
Physical Science > Nano objects
Physical Science > Nanomagnetics
|Deposited By:||Anuj Seth|
|Deposited On:||17 Dec 2008 13:24|
|Last Modified:||20 Jan 2009 10:32|
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