Discontinuous resistance change and domain wall scattering in patterned NiFe wires with a nanoconstriction

Author

Lepadatu, S. ; Xu, Y.B.

Author_Institution

Dept. of Electron., Univ. of York, UK

Volume

40

Issue

4

fYear

2004

fDate

7/1/2004 12:00:00 AM

Firstpage

2688

Lastpage

2690

Abstract

A nonlinear current-voltage (I-V) characteristic was observed in patterned NiFe wires with a central "bow-tie" point contact constriction. By passing a dc current through the wire, a sharp resistance drop was obtained for current densities in the range of 1.1-1.4×10⁷ A/cm². This is attributed to current-induced domain wall drag, resulting in displacement of a domain wall away from the constriction. A maximum current-induced resistance change of 0.079% was obtained for a 100-nm constriction, which is comparable with the magnetoresistance due to domain wall scattering in NiFe.

Keywords

ferromagnetic materials; iron alloys; magnetic domain walls; magnetoresistance; nanowires; nickel alloys; wires; 100 nm; NiFe; bow-tie point contact constriction; current-induced domain wall drag; current-induced resistance change; dc current; discontinuous resistance change; domain wall movement; domain wall scattering; magnetoresistance; nanoconstriction; nonlinear current-voltage characteristic; patterned NiFe wires; resistance drop; Current density; Electrical resistance measurement; Lithography; Magnetic domain walls; Magnetic domains; Magnetic separation; Magnetoresistance; Scattering; Ultrasonic variables measurement; Wires; Domain wall movement; domain wall scattering; magnetoresistance; nanoconstriction;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2004.832369

Filename

1325610