Magnetic properties of large-area particle arrays fabricated using block copolymer lithography

Author

Cheng, Joy Y. ; Ross, C.A. ; Thomas, E.L. ; Smith, Henry I. ; Lammertink, R.G.H. ; Vancso, G.J.

Author_Institution

Dept. of Mater. Sci. & Eng., MIT, Cambridge, MA, USA

Volume

38

Issue

5

fYear

2002

fDate

9/1/2002 12:00:00 AM

Firstpage

2541

Lastpage

2543

Abstract

50-nm period arrays of Co particles with widths of 35 nm and heights of 5-20 nm have been made using a self-assembled block copolymer lithography. The magnetic particles have in-plane anisotropy due to their shape, and show thermally activated reversal with an activation volume larger than their physical volume, which is attributed to magnetic interactions between the particles.

Keywords

arrays; cobalt; ferromagnetic materials; ion beam lithography; magnetic anisotropy; magnetic particles; magnetisation reversal; nanostructured materials; nanotechnology; polymer blends; self-assembly; sputter etching; 35 nm; 5 to 20 nm; 50 nm; Co; Co particles; activation volume; in-plane anisotropy; large-area particle arrays; magnetic dot arrays; magnetic interactions; magnetic particles; magnetic properties; nanoscale magnetic particles; period arrays; physical volume; self-assembled block copolymer lithography; shape; thermally activated reversal; Cobalt; Etching; Lithography; Magnetic particles; Magnetic properties; Materials science and technology; Nanoparticles; Polymers; Self-assembly; Shape;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2002.801926

Filename

1042258