Volume 86, Number 6, June 2009
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||10 July 2009|
Measurement of the vortex core in sub-100 nm Fe dots using polarized neutron scattering
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
Accepted: 2 June 2009
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.
PACS: 75.75.+a – Magnetic properties of nanostructures / 75.60.-d – Domain effects, magnetization curves, and hysteresis / 61.05.F- – Neutron diffraction and scattering
© EPLA, 2009
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.