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Tracking the local reversal processes in nanostructures by magnetic speckles

DOI: 10.1103/PhysRevB.70.180402 DOI Help

Authors: K. Chesnel (DRFMC, CEA-Grenoble, France) , M. Belakhovsky (DRFMC, CEA-Grenoble, France) , G. Van Der Laan (Diamond Light Source) , F. Livet (ENSEEG-Domaine Universitaire, France) , A. Marty (DRFMC, CEA-Grenoble, France) , G. Beutier (Diamond Light Source) , S. Collins (Diamond Light Source) , A. Haznar (Daresbury Laboratory, France)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 70 (18)

State: Published (Approved)
Published: November 2004

Abstract: We have used coherent soft x-ray resonant magnetic scattering to locally track reversal processes in magnetic nanostructures. Coherent illumination of a limited number of nano-objects in a CoPt nanoline grating produces a specific speckle pattern, whose evolution under in situ magnetic field reveals the true local magnetic ordering. While each nanoline behaves as a single macrospin whose direction depends on the dipolar coupling with neighbors, the global reversal of the line array is successively governed by two effects: first, by the random distribution of defects, followed by the dipolar coupling favoring antiferromagnetic ordering.

Subject Areas: Physics

Facility: ESRF