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Direct observation of Oersted-field-induced magnetization dynamics in magnetic nanostripes

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Abstract

We have used time-resolved x-ray photoemission electron microscopy to investigate the magnetization dynamics induced by nanosecond current pulses in NiFe/Cu/Co nanostripes. A large tilt of the NiFe magnetization in the direction transverse to the stripe is observed during the pulses. We show that this effect cannot be quantitatively understood from the amplitude of the Oersted field and the shape anisotropy. High frequency oscillations observed at the onset of the pulses are attributed to precessional motion of the NiFe magnetization about the effective field. We discuss the possible origins of the large magnetization tilt and the potential implications of the static and dynamic effects of the Oersted field on current-induced domain wall motion in such stripes.

Most cited references1

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High domain wall velocity at zero magnetic field induced by low current densities in spin-valve nanostripes

(2008)
Current-induced magnetic domain wall motion at zero magnetic field is observed in the permalloy layer of a spin-valve-based nanostripe using photoemission electron microscopy. The domain wall movement is hampered by pinning sites, but in between them high domain wall velocities (exceeding 150 m/s) are obtained for current densities well below $$10^{12} \unit{A/m^2}$$, suggesting that these trilayer systems are promising for applications in domain wall devices in case of well controlled pinning positions. Vertical spin currents in these structures provide a potential explanation for the increase in domain wall velocity at low current densities.
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Author and article information

Journal
05 February 2010
2011-01-14
Article
10.1103/PhysRevB.83.020406
1002.1302

Physical Review B 83 (2011) 020406
Published in Phys. Rev. B 83, 020406 (2011) (Rapid Communications)
cond-mat.mtrl-sci
ccsd