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Dissertations / Theses on the topic 'Pt/Co system'

Author: Grafiati

Published: 25 May 2024

Last updated: 31 July 2025

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1

Eimer, Sylvain. "Study of Pt/Co system. From growth to magnetism and spin electronics." Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS526.

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La thèse porte sur l’élaboration et l’étude de couches nanométriques allant de Pt/Co/Pt à Pt/Co/oxyde et Pt/Co/métal lourd. Ces couches pourront faire partie du cœur magnétique de dispositifs spintroniques. Une anisotropie magnétique perpendiculaire (PMA) est requise. L’objectif est de modifier et contrôler la PMA et de manipuler l’aimantation, par un champ magnétique et aussi par tout autre moyen tel que la lumière, la contrainte ou le courant. Une part importante du travail concerne la mise en place de plusieurs plateformes de croissance (pulvérisation cathodique), de traitement (irradiation

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2

Frauen, Axel [Verfasser], and Hans Peter [Akademischer Betreuer] Oepen. "Magneto-Thermoelectric Effects in Co/Pt Layered Systems / Axel Frauen ; Betreuer: Hans Peter Oepen." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2018. http://d-nb.info/1151639001/34.

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3

Clark, Joshua Patrick. "A multinuclear solid state nuclear magnetic resonance investigation of the preparation of Co, Pt and Ni based hydrogenation catalyst systems." Thesis, University of Warwick, 2017. http://wrap.warwick.ac.uk/106443/.

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It was known highly dispersed Co (HDC) catalysts for Fischer-Tropsch applications could be synthesised from either Co metal or CoCO3 precursors. Both synthesis routes were known to precipitate Co oxide nanoparticles from solution onto a support via Co(III) ammine complexes. The synthesis pathway was not known. Using solid state NMR and single crystal X-ray diffraction (XRD) a suite of Co(III) complexes have been characterised. The HDC catalyst synthesis from Co metal produced the Co(III) complex which was identified as [(Co(NH3)3)2(μ-OH)2(μ-CO3)](CO3)∙5H2O via single crystal XRD. The 59 Co sol

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4

Gachon, Jean-Claude. "Enthalpies de formation des composés binaires de métaux de transition par réaction directe dans un calorimètre 1800 K. : Discussion de méthodes de prévisions thermodynamiques et structurales." Nancy 1, 1986. http://www.theses.fr/1986NAN10055.

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Mise au point d'un nouveau calorimètre pouvant fonctionner depuis la température ambiante jusqu'à 1800K. Application à des mesures de capacité calorifique et d'enthalpie de formation ainsi qu'à l'analyse thermique différentielle. Caractérisation de l'enthalpie de 27 composés binaires de métaux de transition. Étude à partir des résultats de plusieurs modèles de prévision des enthalpies de formation d'alliages. Discussion des résultats. Proposition d'un modèle prévisionnel de stoechiométries et des structures des phases binaires susceptibles d'apparaître dans un système métallique

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5

Leroux, Christine. "Etude du diagramme de phase et des transformations ordre-desordre du systeme co-pt par microscopie electronique par transmission et resistivite." Université Louis Pasteur (Strasbourg) (1971-2008), 1989. http://www.theses.fr/1989STR13014.

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Determination des diagrammes chimique et magnetique du systeme co-pt. Etude des differentes microstructures des phases ordonnees et des biphasages ordre-ordre et ordre-desordre. Etablissement d'une correlation entre desordre de spin et desordre chimique

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6

Le, Bouar Yann. "Influence des effets elastiques lors de la mise en ordre coherente dans le systeme co-pt : microstructures de biphasage l1#0 + l1#2." Palaiseau, Ecole polytechnique, 1998. http://www.theses.fr/1998EPXX0066.

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Les alliages co-pt forment une solution solide cubique a faces centrees a haute temperature et s'ordonnent sur ce reseau pour former soit une surstructure cubique de type l1#2, soit une surstructure quadratique de type l1#0. Il existe un petit intervalle de concentration pour lequel ces deux phases ordonnees coexistent a l'equilibre. Les microstructures obtenues par l'arrangement spatial de ces deux phases sont complexes, regulieres et organisees sur plusieurs echelles. La formation de telles microstructures est necessairement pilotee par des effets de coherence elastique qui sont les seuls a

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7

Matthes, Patrick. "Magnetic and Magneto-Transport Properties of Hard Magnetic Thin Film Systems." Doctoral thesis, Universitätsbibliothek Chemnitz, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-192683.

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The present thesis is about the investigation of ferromagnetic thin film systems with respect to exchange coupling, magnetization reversal behavior and effects appearing in magnetic heterostructures, namely the exchange bias and the giant magnetoresistance effect. For this purpose, DC magnetron sputtered thin films and multilayers with perpendicular magnetic anisotropy were prepared on single crystalline and rigid as well as flexible amorphous substrates. The first part concentrates on magnetic data storage applications based on the combination of the concept of bit patterned media and three d

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8

Bordeaux, Frédéric. "Mélange atomique exothermique et amorphisation en phase solide dans des composites de multicouches fines métal-métal préparés par co-laminage." Grenoble INPG, 1989. http://www.theses.fr/1989INPG0108.

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Etude des reactions exothermiques de melange atomique et d'amorphisation par reaction en phase solide dans des composites de multicouches fines metal-metal fabriques par co-laminage de rubans de materiaux purs ou d'alliages amorphes ou cristallises. La simulation numerique des reactions exothermiques est comparee aux resultats experimentaux et les utilisations possibles de ces composites en tant que fusibles de coupe circuit et alliages de brasure sont detaillees

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9

Matthes, Patrick. "Magnetic and Magneto-Transport Properties of Hard Magnetic Thin Film Systems." Doctoral thesis, Universitätsverlag der Technischen Universität Chemnitz, 2015. https://monarch.qucosa.de/id/qucosa%3A20376.

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The present thesis is about the investigation of ferromagnetic thin film systems with respect to exchange coupling, magnetization reversal behavior and effects appearing in magnetic heterostructures, namely the exchange bias and the giant magnetoresistance effect. For this purpose, DC magnetron sputtered thin films and multilayers with perpendicular magnetic anisotropy were prepared on single crystalline and rigid as well as flexible amorphous substrates. The first part concentrates on magnetic data storage applications based on the combination of the concept of bit patterned media and three d

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10

Divya, V. D. "Diffusion Studies On Systems Related to Nickel Based Superalloys." Thesis, 2011. https://etd.iisc.ac.in/handle/2005/1948.

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Superalloys offer high temperature strength, excellent creep, corrosion and oxidation resistances, microstructural stability and good fatigue life at elevated temperatures. The composition of the superalloys has been modified continuously to improve the properties. The addition of Pt improves oxidation resistance without compromising the mechanical properties of the superalloys. To further enhance the performance of the superalloy components, various coatings are applied on them. The-(NiPt)Al intermetallic compound bond coats, which are presently utilized, have certain drawbacks. Diffusio

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11

Divya, V. D. "Diffusion Studies On Systems Related to Nickel Based Superalloys." Thesis, 2011. http://etd.iisc.ernet.in/handle/2005/1948.

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Superalloys offer high temperature strength, excellent creep, corrosion and oxidation resistances, microstructural stability and good fatigue life at elevated temperatures. The composition of the superalloys has been modified continuously to improve the properties. The addition of Pt improves oxidation resistance without compromising the mechanical properties of the superalloys. To further enhance the performance of the superalloy components, various coatings are applied on them. The-(NiPt)Al intermetallic compound bond coats, which are presently utilized, have certain drawbacks. Diffusion

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12

Al, Mana Noor. "Design of Embedded Metal Catalysts via Reverser Micro-Emulsion System: a Way to Suppress Catalyst Deactivation by Metal Sintering." Diss., 2016. http://hdl.handle.net/10754/614070.

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The development of highly selective and active, long-lasting, robust, low-cost and environmentally benign catalytic materials is the greatest challenge in the area of catalysis study. In this context, core-shell structures where the active sites are embedded inside the protecting shell have attracted a lot of researchers working in the field of catalysis owing to their enhanced physical and chemical properties suppress catalyst deactivation. Also, a new active site generated at the interface between the core and shell may increases the activity and efficiency of the catalyst in catalytic react

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13

Chang, Che Chun, and 張哲鈞. "Study of Anisotropic Interface Magnetoresistance of Fe, Co, Ni, CuNi and Pt, Pd Combination Multilayered System." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/51265496522226845172.

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碩士<br>國立政治大學<br>應用物理研究所<br>101<br>Ferromagnetic metallic materials show anisotropic magnetoresistance (AMR) effect, that is the resistivity measured with current parallel to the applied magnetic field is larger than perpendicular to the applied magnetic field. In thin films with current in the plane, there are two directions for applying perpendicular magnetic field, one is field in plane, the other is field perpendicular to the plane. The magnetoresistance measured with three current-field relative directions were named longitudinal (L), transverse (T), and perpendicular (P) MR. In single fer

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14

Baheti, Varun A. "Diffusion-Controlled Growth of Phases in Metal-Tin Systems Related to Microelectronics Packaging." Thesis, 2017. http://etd.iisc.ac.in/handle/2005/3985.

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The electro–mechanical connection between under bump metallization (UBM) and solder in flip–chip bonding is achieved by the formation of brittle intermetallic compounds (IMCs) during the soldering process. These IMCs continue to grow in the solid–state during storage at room temperature and service at an elevated temperature leading to degradation of the contacts. In this thesis, the diffusion–controlled growth mechanism of the phases and the formation of the Kirkendall voids at the interface of UBM (Cu, Ni, Au, Pd, Pt) and Sn (bulk/electroplated) are studied extensively. Based on the microst

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15

Baheti, Varun A. "Diffusion-Controlled Growth of Phases in Metal-Tin Systems Related to Microelectronics Packaging." Thesis, 2017. http://etd.iisc.ernet.in/2005/3985.

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The electro–mechanical connection between under bump metallization (UBM) and solder in flip–chip bonding is achieved by the formation of brittle intermetallic compounds (IMCs) during the soldering process. These IMCs continue to grow in the solid–state during storage at room temperature and service at an elevated temperature leading to degradation of the contacts. In this thesis, the diffusion–controlled growth mechanism of the phases and the formation of the Kirkendall voids at the interface of UBM (Cu, Ni, Au, Pd, Pt) and Sn (bulk/electroplated) are studied extensively. Based on the microst

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16

Vineeth, Mohanan P. "Spin Hall Effect Mediated Current Induced Magnetization Reversal in Perpendicularly Magnetized Pt/Co/Pt Based Systems." Thesis, 2016. http://etd.iisc.ac.in/handle/2005/3078.

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In the present thesis, magnetization reversal in both out-of-plane and in-plane magnetized thin lms and in devices fabricated out of those lms are explored. Pt/Co/Pt stacks with ultrathin Co layer were in-estimated initially for understanding their magnetic properties in this thesis. These perpendicular magnetized systems are good candidates for magnetic hard disc drives due to their large anisotropy, which may allow miniaturization of magnetic data storage devices. The spin Hall e ect mediated current-induced magnetization reversal in patterned Pt/Co/Pt devices were extensively investigated.

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17

Vineeth, Mohanan P. "Spin Hall Effect Mediated Current Induced Magnetization Reversal in Perpendicularly Magnetized Pt/Co/Pt Based Systems." Thesis, 2016. http://hdl.handle.net/2005/3078.

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In the present thesis, magnetization reversal in both out-of-plane and in-plane magnetized thin lms and in devices fabricated out of those lms are explored. Pt/Co/Pt stacks with ultrathin Co layer were in-estimated initially for understanding their magnetic properties in this thesis. These perpendicular magnetized systems are good candidates for magnetic hard disc drives due to their large anisotropy, which may allow miniaturization of magnetic data storage devices. The spin Hall e ect mediated current-induced magnetization reversal in patterned Pt/Co/Pt devices were extensively investigated.

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18

Glaner, Lizelle. "A study of the Ni-Pt-Ru and Co-Pt-Ru systems." Thesis, 2011. http://hdl.handle.net/10539/10537.

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The solidification projections and 1000°C isothermal sections of the Ni-Pt-Ru and Co-Pt-Ru systems were determined by characterising alloys of different using SEM and XRD on arc-melted as-cast and annealed samples. Hardness measurements were undertaken and the hardness indentations were also used to determine the preliminary toughness of the samples. The solidification projection of the Ni-Pt-Ru system showed that the (Ni,Pt) solvus retreats to the Pt corner in the ternary wherever (Ru) formed where it was not expected and a third phase appeared after heat treatment on a locus from ~Ni20: Pt3

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