Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2004-07-21
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Accepted for publication in Appl. Phys. Lett
Scientific paper
10.1063/1.1787154
We present a versatile method for detecting the presence and motion of a trapped domain wall in a narrow ferromagnetic layer using current-perpendicular-to-plane (CPP) giant magnetoresistance (MR). The CPP-MR response to small motions of the trapped domain wall is enhanced because the CPP current is restricted to the region of wall trapping. We use a Permalloy/Cu/Permalloy spin valve in the shape of a long, ~500-nm-wide wire with a constriction (notch) near its middle that acts as a trapping site for a head-to-head domain wall. Two different notch shapes were studied, mostly at 4.2 K but also at 295K.
Pratt William P. Jr.
Zambano A. J.
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