Detecting domain-wall trapping and motion at a constriction in narrow ferromagnetic wires using perpendicular-current giant magnetoresistance
Applied Physics Letters, ISSN: 0003-6951, Vol: 85, Issue: 9, Page: 1562-1564
2004
- 17Citations
- 18Captures
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Article Description
A method, aimed at the detection of the presence and motion of a trapped domain wall in a narrow ferromagnetic layer using current-perpendicular-to-plane (CPP) giant magnetoresistance (MR), was presented. The CPP-MR response to small motions of the trapped domain wall was shown to be enhanced since the CPP current is restricted to the region of the wall trapping. A Permalloy/Cu/ Permalloy spin valve, in the shape of a long, ∼50 nm wide wire with a notch near its middle, was used which acts as a trapping site for a head-to-head domain wall. Two different notch shapes at 4.2 K and 295 K were also studied.
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