Giant enhancement of the domain wall velocity in irradiated ultrathin magnetic nanowires

Author

Jamet, J.P. ; Ferré, J. ; Meyer, P. ; Gierak, J. ; Vieu, C. ; Rousseaux, F. ; Chappert, C. ; Mathet, V.

Author_Institution

Lab. de Phys. des Solides, Univ. de Paris-Sud, Orsay, France

Volume

37

Issue

4

fYear

2001

fDate

7/1/2001 12:00:00 AM

Firstpage

2120

Lastpage

2122

Abstract

Domain wall velocity measurements in ultrathin Pt/Co(0.6 nm)/Pt narrow magnetic wires with perpendicular anisotropy are reported. Tracks (0.35 and 0.9 microns wide) are defined by drawing twins of parallel etched/irradiated lines with a focused Ga⁺ beam (FIB). In these films, irradiation induces a large decrease in coercivity due to Co-Pt intermixing at the interfaces, as checked in areas submitted to various fluences. At the same field, the domain wall propagates at far higher velocities in a 0.45 μm track than in the virgin film. It is explained by the calculated irradiation fluence profile. Hence, irradiation can be used to design structures where the magnetic information propagates very rapidly under a small applied field

Keywords

cobalt; coercive force; magnetic domain walls; magnetic multilayers; nanostructured materials; perpendicular magnetic anisotropy; platinum; 0.6 nm; Pt-Co; Pt/Co(0.6 nm)/Pt narrow magnetic wires; coercivity; domain wall velocity; giant enhancement; irradiated ultrathin magnetic nanowires; perpendicular anisotropy; Anisotropic magnetoresistance; Etching; Magnetic anisotropy; Magnetic domain walls; Magnetic domains; Magnetic films; Nanowires; Optical films; Optical microscopy; Perpendicular magnetic anisotropy;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.951072

Filename

951072