Title :
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
fDate :
7/1/2004 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2004.832369
