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

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Published 10 July 2009 • Europhysics Letters Association
, , Citation Igor V. Roshchin et al 2009 EPL 86 67008 DOI 10.1209/0295-5075/86/67008

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Author affiliations

1 Physics Department, Texas A&M University - College Station, TX, 77843-4242, USA

2 Physics Department, University of California-San Diego - La Jolla, CA 92093-0319, USA

3 Departament de Fisica Fonamental, Universitat de Barcelona - 08028 Barcelona, Catalonia, Spain, EU

4 Los Alamos National Laboratory - Los Alamos, NM 87545, USA

5 Facultad de Física, Pontificia Universidad Católica de Chile - Santiago, Chile

6 Departamento de Física, Universidad de Santiago de Chile (USACH) - Santiago, Chile

7 Materials Department, CINVESTAV - Querétaro, Mexico

8 Present address: Physics Department, University of Michigan - Ann Arbor, MI, USA.

9 Present address: Advanced Light Source, LBNL - Berkeley, CA, USA.

10 Present addres: Physics Department, Pusan National University - Pusan, Korea.

11 Present address: Physics Department, University of Indiana - Bloomington, IN, USA.

Dates

  1. Received 2 December 2008
  2. Accepted 2 June 2009
  3. Published
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0295-5075/86/6/67008

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.

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