Format

Send to

Choose Destination
Nanotechnology. 2008 Jun 18;19(24):245305. doi: 10.1088/0957-4484/19/24/245305. Epub 2008 May 9.

Arrays of ultrasmall metal rings.

Author information

1
Department of Physics, University of Massachusetts, Amherst, MA 01003, USA.

Abstract

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.

Supplemental Content

Full text links

Icon for IOP Publishing Ltd.
Loading ...
Support Center