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EPL Association, European Physical Society Letters, 6(86), p. 67008, 2009

DOI: 10.1209/0295-5075/86/67008

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

Journal article published in 2009 by Igor V. Roshchin, Chang-Peng Li, Harry Suhl, Xavier Batlle, S. Roy, Sunil K. Sinha, S. Park, Roger Pynn, M. R. Fitzsimmons, Jose Mejía-López ORCID, Dora Altbir, A. H. Romero, Ivan K. Schuller
This paper is available in a repository.
This paper is available in a repository.

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Abstract

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.