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Observation of injection and pinning of domain walls in magnetic nanowires using photoemission electron microscopy

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7 Author(s)
Thomas, L. ; IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120 ; Rettner, C. ; Hayashi, Masamitsu ; Samant, Mahesh G.
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Photoemission electron microscopy is used to explore the injection and pinning of magnetic domain walls in 250-nm-wide, 20-nm-thick Permalloy nanowires. Domain walls are injected from a micron-sized elliptical nucleation pad at one end of the nanowire. A vortex-like structure is readily nucleated in this pad at low magnetic fields (≪15 Oe), whereas injection of a domain wall into the nanowire requires significantly larger fields (∼60 Oe). Domain walls are pinned in the nanowire at notches patterned along the wire’s edges. The domain walls are observed to have vortex-like structures with chiralities that vary in successive experiments.

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Applied Physics Letters  (Volume:87 ,  Issue: 26 )