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Growth and magnetic characterization of Co nanoparticles obtained by femtosecond pulsed laser deposition

DOI: 10.1103/PhysRevB.79.014414 DOI Help

Authors: A. Cebollada (Instituto de Microelectrónica de Madrid (IMM)) , J. M. Garcia Martin (Instituto de Microelectrónica de Madrid (IMM)) , C. Clavero (Instituto de Microelectrónica de Madrid (IMM)) , Ll. Balcells (ICMAB-CSIC, Campus UAB, 08193 Bellaterra, Barcelona, Spain) , S. Estrade (Departamento de Electrónica, Ingeniería y Materiales Electrónicos (EME), Universidad de Barcelona, C/Martí i Franques 1, 08028 Barcelona, Spain) , J. Arbiol (Departamento de Electrónica, Ingeniería y Materiales Electrónicos (EME), Universidad de Barcelona, C/Martí i Franques 1, 08028 Barcelona, Spain) , F. Peiro (Departamento de Electrónica, Ingeniería y Materiales Electrónicos (EME), Universidad de Barcelona, C/Martí i Franques 1, 08028 Barcelona, Spain) , C. Smith (Department of Physics and FOCUS Center, University of Michigan, 450 Church St., Ann Arbor, Michigan 48109, USA) , R. Clarke (Department of Physics and FOCUS Center, University of Michigan, 450 Church St., Ann Arbor, Michigan 48109, USA) , L. Martinez (Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC), 28029 Cantoblanco, Madrid, Spain) , Y. Huttel (Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC), 28029 Cantoblanco, Madrid, Spain) , E. Roman (Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC), 28029 Cantoblanco, Madrid, Spain) , N. D. Telling (Magnetic Spectroscopy Group, Daresbury Laboratory, Warrington WA4 4AD, United Kingdom and School of Earth, Atmospheric and Environmental Science, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom) , G. Van Der Laan (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 79 (1) , PAGES 014414-1/13

State: Published (Approved)
Published: January 2009

Abstract: We present a detailed study on the morphology and magnetic properties of Co nanostructures deposited onto oxidized Si substrates by femtosecond pulsed laser deposition. Generally, Co disks of nanometric dimensions are obtained just above the ablation threshold, with a size distribution characterized by an increasingly larger number of disks as their size diminishes, and with a maximum disk size that depends on the laser power density. In Au/Co/Au structures, in-plane magnetic anisotropy is observed in all cases, with no indication of superparamagnetism regardless of the amount of material or the laser power density. Magnetic force microscopy observations show coexistence of single-domain and vortex states for the magnetic domain structure of the disks. Superconducting quantum interference device magnetometry and x-ray magnetic circular dichroism measurements point to saturation magnetization values lower than the bulk, probably due to partial oxidation of the Co resulting from incomplete coverage by the Au capping layer.

Subject Areas: Physics


Instruments: NONE-No attached Diamond beamline

Added On: 19/08/2009 23:07

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