Measurement of the vortex core in sub-100 nm Fe dots using polarized neutron scattering

We use polarized neutron scattering to obtain quantitative information about the magnetic state of sub-100 nm circular magnetic dots. Evidence for the transition from a single domain to a vortex state, as a function of the dot diameter and magnetic field, is found from magnetization curves and confi...

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Bibliographic Details
Published in:Europhysics letters 2009-06, Vol.86 (6), p.67008-67008P6
Main Authors: Roshchin, Igor V, Li, Chang-Peng, Suhl, Harry, Batlle, Xavier, Roy, S, Sinha, Sunil K, Park, S, Pynn, Roger, Fitzsimmons, M. R, Mejía-López, Jose, Altbir, Dora, Romero, A. H, Schuller, Ivan K
Format: Article
Language:English
Subjects:
61.05.F
75.60.-d
75.75.+a
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Summary:We use polarized neutron scattering to obtain quantitative information about the magnetic state of sub-100 nm circular magnetic dots. Evidence for the transition from a single domain to a vortex state, as a function of the dot diameter and magnetic field, is found from magnetization curves and confirmed by micromagnetic and Monte-Carlo simulations. For 20 nm-thick Fe dots with diameters close to 60 nm, the vortex is the ground state. The magnetization of the vortex core (140 ± 50 emu/cm3) and its diameter (19 ± 4 nm) obtained from polarized neutron scattering are in agreement with simulations.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/86/67008