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

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; Dora Altbir; A. H. Romero; Ivan K. Schuller

doi:10.1209/0295-5075/86/67008

All issues

Volume 86 / No 6 (June 2009)

EPL, 86 6 (2009) 67008

Abstract

Issue		EPL Volume 86, Number 6, June 2009


Article Number		67008
Number of page(s)		5
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/86/67008
Published online		10 July 2009

EPL, 86 (2009) 67008

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

Igor V. Roshchin¹^,2, Chang-Peng Li², Harry Suhl², Xavier Batlle³, S. Roy², Sunil K. Sinha², S. Park⁴, Roger Pynn⁴, M. R. Fitzsimmons⁴, Jose Mejía-López⁵, Dora Altbir⁶, A. H. Romero⁷ and Ivan K. Schuller²

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

Received: 2 December 2008
Accepted: 2 June 2009

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.

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

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