title: Ferromagnetic Mn-Implanted GaP: Microstructures vs Magnetic Properties.
abstract: Ferromagnetic GaMnP layers were prepared by ion implantation and pulsed laser annealing (PLA). We present a systematic investigation on the evolution of microstructure and magnetic properties depending on the pulsed laser annealing energy. The sample microstructure was analyzed by high-resolution X-ray diffraction (HR-XRD), transmission electron microscopy (TEM), Rutherford backscattering spectrometry (RBS), ultraviolet Raman spectroscopy (UV-RS), and extended X-ray absorption fine structure (EXAFS) spectroscopy. The presence of X-ray Pendellösung fringes around GaP (004) and RBS channeling prove the epitaxial structure of the GaMnP layer annealed at the optimized laser energy density (0.40 J/cm(2)). However, a forbidden TO vibrational mode of GaP appears and increases with annealing energy, suggesting the formation of defective domains inside the layer. These domains mainly appear in the sample surface region and extend to almost the whole layer with increasing annealing energy. The reduction of the Curie temperature (TC) and of the uniaxial magnetic anisotropy gradually happens when more defects and the domains appear as increasing the annealing energy density. This fact univocally points to the decisive role of the PLA parameters on the resulting magnetic characteristics in the processed layers, which eventually determine the magnetic (or spintronics) figure of merit.
authors.affiliation: Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden Rossendorf , Bautzner Landstrasse 400, D-01328 Dresden, Germany.|Technische Universität Dresden , D-01062 Dresden, Germany.
authors.forename: Ye
authors.initials: Y
authors.lastname: Yuan
authors.affiliation: Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden Rossendorf , Bautzner Landstrasse 400, D-01328 Dresden, Germany.
authors.forename: René
authors.initials: R
authors.lastname: Hübner
authors.affiliation: Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden Rossendorf , Bautzner Landstrasse 400, D-01328 Dresden, Germany.|Technische Universität Dresden , D-01062 Dresden, Germany.
authors.forename: Fang
authors.initials: F
authors.lastname: Liu
authors.affiliation: Institute of Physics, Polish Academy of Sciences , al. Lotników 32/46, PL-02 668 Warszawa, Poland.
authors.forename: Maciej
authors.initials: M
authors.lastname: Sawicki
authors.affiliation: Institute of Physics, Chemnitz University of Technology , 09107 Chemnitz, Germany.
authors.forename: Ovidiu
authors.initials: O
authors.lastname: Gordan
authors.affiliation: Institute of Physics, Chemnitz University of Technology , 09107 Chemnitz, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Salvan
authors.affiliation: Institute of Physics, Chemnitz University of Technology , 09107 Chemnitz, Germany.
authors.forename: D R T
authors.initials: DR
authors.lastname: Zahn
authors.affiliation: Dutch-Belgian Beamline (DUBBLE), ESRF - The European Synchrotron , CS 40220, 38043 Grenoble, France.
authors.forename: D
authors.initials: D
authors.lastname: Banerjee
authors.affiliation: Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden Rossendorf , Bautzner Landstrasse 400, D-01328 Dresden, Germany.
authors.forename: Carsten
authors.initials: C
authors.lastname: Baehtz
authors.affiliation: Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden Rossendorf , Bautzner Landstrasse 400, D-01328 Dresden, Germany.|Technische Universität Dresden , D-01062 Dresden, Germany.
authors.forename: Manfred
authors.initials: M
authors.lastname: Helm
authors.affiliation: Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden Rossendorf , Bautzner Landstrasse 400, D-01328 Dresden, Germany.
authors.forename: Shengqiang
authors.initials: S
authors.lastname: Zhou
keywords: GaMnP; dilute ferromagnetic semiconductors; ion implantation; magnetic properties; microstructures; pulsed laser annealing