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1. Exciton mechanisms and modeling of the ionoluminescence in silica

Author

Fernando Agulló-López, A. Muñoz-Martín, D. Jiménez-Rey, D. Bachiller-Perea, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM PCI), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Univ. Paris-Sud

Subjects
[PHYS]Physics [physics], Acoustics and Ultrasonics, Chemistry, Exciton, Kinetics, Thermodynamics, 02 engineering and technology, Function (mathematics), 021001 nanoscience & nanotechnology, Condensed Matter Physics, Kinetic energy, 01 natural sciences, Fluence, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, 0103 physical sciences, Irradiation, [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat], Atomic physics, 010306 general physics, 0210 nano-technology
Abstract

In this chapter a theoretical model is presented to discuss detailed kinetic data describing the evolution of the two main ionoluminescence (IL) bands at 650 (1.9) and 460 nm (2.7 eV) in silica as a function of the irradiation fluence at room temperature. Some of the data shown in Chap. 7 will be used in this chapter to introduce the physical model here presented. In particular, the results obtained for dry silica (IR, low OH content) will be evoked here as an introduction for the model, since this is the type of silica (of the three that were used for Chap. 7) with the highest purity. A physical model is proposed to explain the kinetics of the main IL emissions of silica, and a preliminary mathematical formulation is deduced and proved by fitting some of the data obtained in Chap. 7.

Published
2016
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2. Perpendicular magnetization of FePt particles in silica induced by swift heavy ion irradiation

Author

Fouran Singh, L. Vincent, J.C. Pivin, O Angelov, CSNSM PCI, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, Acoustics and Ultrasonics, Intermetallic, 02 engineering and technology, FILMS, 01 natural sciences, Ion, Condensed Matter::Materials Science, Magnetization, Swift heavy ion, Nuclear magnetic resonance, DEFORMATION, 0103 physical sciences, NANOPARTICLES, Irradiation, 010302 applied physics, Condensed matter physics, Magnetostriction, Coercivity, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Transmission electron microscopy, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], 0210 nano-technology
Abstract

Particles of the FePt intermetallic compound with L1(0) structure embedded in silica films were submitted to irradiation by 120 MeV Au ions at different fluences. Observations by transmission electron microscopy evidenced an elongation of the particles, ascribed to an anisotropic ripening process during the thermal spikes occurring in the wake of the ions. However, the observed changes in the magnetic properties are attributed to the magnetostriction of the particles. Their compression by the matrix induces a tilt of easy magnetization axis from in-plane to perpendicular to the film surface, together with an increase in coercivity.

Published
2008
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3. Defect Induced Intrinsic Ferromagnetism in Fullerene Thin Films

Author

J.C. Pivin, Amit Kumar, D.K. Avasthi, Semi-conducteurs à large bande interdite (SC2G), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), CSNSM PCI, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)

Subjects
Fullerene, Materials science, General Physics and Astronomy, 02 engineering and technology, 01 natural sciences, Fluence, Ion, law.invention, CARBON, Condensed Matter::Materials Science, symbols.namesake, Nuclear magnetic resonance, law, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Thin film, 010306 general physics, Electron paramagnetic resonance, Condensed matter physics, General Engineering, 021001 nanoscience & nanotechnology, Ferromagnetism, Amorphous carbon, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], symbols, ELECTRON, C-60, 0210 nano-technology, Raman spectroscopy
Abstract

The occurrence of intrinsic ferromagnetism in energetic ion irradiated fullerene films is reported. The magnetic properties of irradiated fullerene films are studied by superconducting quantum interference device and electron spin resonance. Raman spectroscopy measurement has been performed to investigate the structural transformation at high fluence. The role of electronic energy density deposition by the ions on their magnetic properties is investigated. The origin of magnetic signal in irradiated films is due to the generation of an amorphous carbon network consisting sp(2)/sp(3) bonded carbon atoms. (C) 2008 The Japan Society of Applied Physics

Published
2008
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