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Dissertations / Theses on the topic 'Molecular Magnets'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Henderson, John. "SPIN QUANTUM DYNAMICS IN MOLECULAR MAGNETS." Doctoral diss., University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3535.

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Molecular magnets are ideal systems to probe the realm that borders quantum and classical physics, as well as to study decoherence phenomena in nanoscale systems. The control of the quantum behavior of these materials and their structural characteristics requires synthesis of new complexes with desirable properties which will allow probing of the fundamental aspects of nanoscale physics and quantum information processing. Of particular interest among the magnetic molecular materials are single-molecule magnets (SMMs) and antiferromagnetic (AFM) molecular wheels in which the spin state of the m

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2

Krupskaya, Yulia. "Magnetic Properties of Molecular and Nanoscale Magnets." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-73289.

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The idea of miniaturizing devices down to the nanoscale where quantum ffeffects become relevant demands a detailed understanding of the interplay between classical and quantum properties. Therefore, characterization of newly produced nanoscale materials is a very important part of the research in this fifield. Studying structural and magnetic properties of nano- and molecular magnets and the interplay between these properties reveals new interesting effects and suggests ways to control and optimize the respective material. The main task of this thesis is investigating the magnetic properties o

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3

Morin, Brian Gerald. "Disorder in molecular magnets." The Ohio State University, 1994. http://rave.ohiolink.edu/etdc/view?acc_num=osu1343230971.

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4

Inglis, Ross. "Oxime based manganese molecular magnets." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/4755.

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The synthesis and characterisation of a large family of hexametallic [MnIII 6] Single-Molecule Magnets with general formula [MnIII 6O2(R-sao)6(X)2(L)4-6] (where sao2- = dianion of salicylaldoxime; R = H, Me, Et, Ph; X = O2CR' (R' = H, Me, Ph etc), Hal , O2PHPh or O2P(Ph)2; L = solvent) are presented. Deliberate structural distortions of the [Mn3O] trinuclear moieties within the complexes are used to tune the observed magnetic properties. These findings highlight a qualitative magnetostructural correlation whereby the type (anti- or ferromagentic) of each Mn2 pairwise magnetic exchange is domin

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5

Hu, Jianming, and 胡建明. "Macroscopic quantum phenomenon in molecular magnets." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B26724674.

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6

Heß, Volkmar [Verfasser], Daniel [Akademischer Betreuer] Bürgler, and Thomas [Akademischer Betreuer] Michely. "Scanning tunneling microscopy of single-molecule magnets and hybrid-molecular magnets: Two approaches to molecular spintronics / Volkmar Heß. Gutachter: Daniel Bürgler ; Thomas Michely." Köln : Universitäts- und Stadtbibliothek Köln, 2016. http://d-nb.info/1099592941/34.

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7

Filipovic, Milena [Verfasser]. "Quantum Transport Through Molecular Magnets / Milena Filipovic." Konstanz : Bibliothek der Universität Konstanz, 2015. http://d-nb.info/1098136519/34.

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8

Tancharakorn, Somchai. "Instrumentation development for studies of magnetic and structural properties of molecular magnets." Thesis, University of Edinburgh, 2008. http://hdl.handle.net/1842/9781.

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Tetramethyl ammonium manganese trichloride ([CH3)4N][Mn(II)Cl3]) known as TMMC, has been one of the most interesting systems in experimental magnetism due to its highly one-dimensional magnetic Heisenberg behaviour. The focus of this research programme was to study its magnetic and structural properties as a function of pressure. TMMC crystals were prepared by slow evaporation technique at room temperature; however it quickly became apparent that the material is only weakly magnetic and requires a pressure cell with a very low background. This discovery lead to the programme of instrumentation

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9

Subedi, Pradeep. "Collective effects in Single Molecule Magnets." Thesis, New York University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3602734.

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<p> Single molecule magnets (SMMs), such as Mn<sub>12</sub>-acetate, are composed of transition metal ions and consists of identical molecules with large ground-state spin (<i>S</i> = 10) and a strong uniaxial anisotropy (65 K). Below about 3 K, Mn<sub>12</sub>-acetate exhibits magnetic hysteresis with steps at specific values of longitudinal magnetic field due to resonant quantum tunneling between spin up and down projections along the easy axis. The intermolecular exchange interactions between spins on molecules are quite small and spins are considered to be independent and non-interacting.

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10

Amjad, Asma. "Exchange coupling in molecular magnets: Zero, one and three dimensions." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5755.

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Molecular magnets with different dimensionality, whether they are zero-dimensional single-molecule magnets (SMM) or one-dimensional single-chain magnets (SCM) are very interesting, since they allow probing the fundamental aspects bordering quantum and classical physics at the nanoscale level. This dissertation covers experimental studies of two Mn-based exchange-coupled molecule-based magnets and two Co-based single-chain magnets, using both dc Hall-effect magnetometry and electron paramagnet resonance (EPR) techniques. In these multi-dimensional systems, the spin of the molecule exhibits quan

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11

Bhattacharya, Debojit. "Design characterization and application of molecular magnets : a theoretical study." Thesis, University of North Bengal, 2012. http://hdl.handle.net/123456789/1570.

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12

Prescimone, Alessandro. "Effect of high-pressure on molecular magnetism." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/4619.

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The effect of pressure on a number of magnetically interesting compounds such as single-molecule magnets and dimeric copper and manganese molecules has been investigated to probe the validity of ambient magneto-structural correlations. The first chapter is an introduction to the equipment and methodologies that have been adopted to carry out the experimental high-pressure work. The second chapter reports the first combined high-pressure single crystal X-ray diffraction and high pressure magnetism study of four single-molecule magnets (SMMs). At 1.5 GPa the structures [Mn6O2(Et-sao)6(O2CPh(Me)2

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13

Aliabadi, Azar. "ESR and Magnetization Studies of Transition Metal Molecular Compounds." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-195440.

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Molecule-based magnets (molecular magnets) have attracted much interest in recent decades both from an experimental and from a theoretical point of view, not only because of their interesting physical effects, but also because of their potential applications: e.g., molecular spintronics, quantum computing, high density information storage, and nanomedicine. Molecular magnets are at the very bottom of the possible size of nanomagnets. On reducing the size of objects down to the nanoscale, the coexistence of classical properties and quantum properties in these systems may be observed. In additio

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14

Goodwin, Jeremy C. "An investigation into the synthesis characterisation and magnetic properties of high nuclearity transition metal arrays." Thesis, University of Sheffield, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369849.

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15

Moreno, Pineda Eufemio. "New f-block and mixed d,f-block molecular nanomagnets." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/new-fblock-and-mixed-dfblock-molecular-nanomagnets(2f53085a-081b-4b27-a866-28f37f1fd633).html.

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Molecular Nanomagnets have been proposed as plausible candidates in a variety of futuristic applications. Thorough understanding of the magnetic properties of these systems is therefore necessary to develop devices that include such units. The aim of this thesis is to synthesise and structurally and magnetically characterise a range of systems that could be used as elementary units in three proposed applications such as: data storage devices, magnetic refrigerants and qubits for quantum computing. A series of mixed 3d/4f metal complexes were synthesised through solvothermal reactions and chara

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16

Fu, Zhendong [Verfasser]. "Spin correlations and excitations in spin-frustrated molecular and molecule-based magnets / Zhendong Fu." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2012. http://d-nb.info/102774348X/34.

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17

Marnell, Lisa. "Adsorption of precursor molecular magnets on single crystal metal surfaces." Thesis, University of Liverpool, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.439490.

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18

Kaminski, Danielle. "Electron spin resonance of molecular magnets for quantum information processing." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:f6f50d1d-dea8-48ce-973f-370a0173ba02.

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Quantum information processors have been shown theoretically to outperform their classical counterparts at certain tasks. They comprise two level systems, which can exist in an arbitrary superposition of states: qubits. A strong candidate qubit is the molecular nanomagnet (MNM). In this thesis, electron spin resonance is used to explore the potential of Cr7M based MNMs as elements of a quantum information processor. We explore the possibility and effect of replacing H atoms with D or a halogen atom in a S = 1/2 Cr7Ni ring. Decoherence mechanisms in the resulting compounds are found to be domin

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19

Heras, Ojea Maria Jose. "Directing the assembly of heterometallic molecular magnets using compartmental ligands." Thesis, University of Glasgow, 2017. http://theses.gla.ac.uk/8291/.

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The use of multinucleating ligands capable of directing the synthesis of heterometallic single−molecule magnets (SMMs) is discussed herein. To this end, we have focused on investigating the coordination chemistry of two different ligands (H6L and H2L2) with 3d and/or 4f metal ion precursors. The aminopolyalcohol ligand H6L has been employed in the assembly of twenty−three new complexes, ranging from simple monomers up to hexametallic systems, involving Mn(II/III), Co(II/III), Ni(II), Cu(II) and Ln(III) ions. The obtained monomers however have been utilised as building blocks in subsequent reac

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20

Krupskaya, Yulia [Verfasser], Bernd [Akademischer Betreuer] Büchner, and Rüdiger [Akademischer Betreuer] Klingeler. "Magnetic properties of molecular and nanoscale magnets / Yulia Krupskaya. Gutachter: Rüdiger Klingeler. Betreuer: Bernd Büchner." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://d-nb.info/1028864981/34.

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21

Brunet, Gabriel. "Molecular Engineering of Metal-Organic Assemblies: Advances Toward Next Generation Porous and Magnetic Materials." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/40385.

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The controlled assembly of molecular building blocks is an emerging strategy that allows for the preparation of materials with tailor-made properties. This involves the precise combination of molecular subunits that interact with one another via specifically designed reactive sites. Such a strategy has produced materials exhibiting remarkable properties, including those based on metal-organic frameworks and single-molecule magnets. The present Thesis aims to highlight how such metal-organic assemblies can be engineered at the molecular level to promote certain desired functionalities. Specific

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22

Tyree, William Stuart. "Correlation of Structure and Magnetic Properties in Charge-Transfer Salt Molecular Magnets Composed of Decamethylmetallocene Electron Donors and Organic Electron Acceptors." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/34436.

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Di-n-propyl dicyanofumarate (DnPrDCF) and di-isopropyl dicyanofumarate (DiPrDCF) have been used as one-electron acceptors in the synthesis of charge-transfer salt magnets with decamethylmetallocenes, MCp*2 (M = Mn, Cr). Salts of each acceptor with each metallocene have been characterized and the structures of the chromium analogues have been solved. The two acceptors are structurally similar to dimethyl dicyanofumarate (DMeDCF) and diethyl dicyanofumarate (DEtDCF), which have been previously studied and found to form charge-transfer salt magnets with the aforementioned decamethylmetallocenes

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23

Francese, Tommaso. "Rationalization of the Mechanism of Bistability in Dithiazolyl-based Molecular Magnets." Doctoral thesis, Universitat de Barcelona, 2019. http://hdl.handle.net/10803/666588.

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In this work, we characterized and studied the properties associated to DTA-based bistable organic molecular magnetic systems, namely PDTA and TDPDTA, respectively. In both cases, the low and high temperature phases have been considered, in order to highlight the common and different physical-chemical properties, both from a structural perspective and also in terms of magnetic and thermodynamic properties. The high temperature phases are found to present a uniform stack propagation of the monomers in the columns, whereas the low temperature present, in the case of PDTA, pi-dimers alternated t

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24

Stride, John Arron. "The study of small molecular magnets using neutron and muon spectroscopies." Thesis, University of East Anglia, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309937.

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25

Daniell, Joanna. "Synthesis and characterisation of new spin crossover salts and molecular magnets." Thesis, University of Surrey, 2016. http://epubs.surrey.ac.uk/810422/.

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This research focuses on the synthesis and characterisation of novel molecular salts with the potential to undergo spin crossover (SCO) transitions. SCO describes the reversible transition between the LS and HS states, which can occur in some first row transition metal complexes with d4 – d7 valence electrons, induced by changes in external stimuli such as temperature. The rearrangement of electrons during the SCO transition results in changes to the properties exhibited by the bulk material, which can be characterised by a number of methods. Such techniques used in this work include X-ray dif

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26

Habib, Fatemah. "Investigating and Enhancing Spin Reversal Barriers in Dinuclear 4f Single-Molecule Magnets and the Ultimate Shift to Mononuclear 3d Complexes." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/32174.

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In order for molecular magnetic materials to become applicable, they must retain their magnetisation at reasonable temperatures, which can be achieved with high energy barriers for spin reversal and high blocking temperatures. In the field of Single-Molecule Magnets (SMMs), over the last decade, the main focus has shifted from large spin complexes to highly anisotropic systems which have displayed record energy barriers. There are two main methods of increasing magnetic anisotropy in a complex: i) Choosing a metal ion that boasts high magnetic anisotropy then coupling two such ions through mag

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27

Coomber, Andrew Treeve. "Magnetic and electrical properties of low dimensional molecular solids." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387616.

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28

Lorenz, Amanda Leigh. "Improvement of NdFeB permanent magnets via diffusion annealing." Master's thesis, Universidade de Aveiro, 2012. http://hdl.handle.net/10773/10142.

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Mestrado em Ciência e Engenharia de Materiais<br>Os magnetos sinterizados de Nd-Fe-B, têm o maior produto de energia de todos os magnetos e têm vindo a substituir progressivamente os magnetos ferróicos em aplicações onde é necessária uma maior densidade de energia. São áreas como carros híbridos, acionamento de turbinas eólicas, bobines de motores, e também na miniaturização de dispositivos eletrónicos. Um parâmetro importante é a sua coercividade, e respetiva dependência na temperatura, que determina o intervalo de temperatura de aplicação. A fim de melhorar as temperaturas de funcionamento,

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29

Gonidec, Mathieu. "Synthesis and properties of multifunctional single molecule magnets." Doctoral thesis, Universitat Autònoma de Barcelona, 2010. http://hdl.handle.net/10803/3322.

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En aquest treball s'ha dut a terme la síntesi i la caracterització química de varis complexos de doble capa de ftalocianines de terbi amb l'objectiu d'estudiar les seves propietats magnètiques en una varietat de configuracions. <br/>Es va obtenir una serie de compostos amb propietats físico-químiques distintes, com les d'autoassemblatje en superfície, d'activitat redox o de propietats mesomòrfiques.<br/>Las propietats magnètiques dels compostos sintetitzats varen ser caracteritzades via SQUID, dicroisme circular magnètic (MCD) y dicroisme circular magnètic de rajos-X (XMCD), en una varietat d'

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30

Möller, Johannes S. "Muon-spin relaxation and its application in the study of molecular quantum magnets." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:7f19318c-a78e-4499-803b-b93df5ee169a.

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This thesis is concerned with the muon-spin relaxation (musr) technique and its application in the study of a number of molecular magnetic systems that may be driven through a quantum phase transition at low temperatures through the application of a magnetic field or hydrostatic pressure. Musr is a highly sensitive probe of magnetism, but its utility can be severely limited by the lack of knowledge of the muon implantation site and the extent to which the muon perturbs its host. In a system of ionic fluorides, where partial information about the muon site is experimentally available, I demonst

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31

Tejada, J., S. Velez, and R. Zarzuela. "Quantum Nanomagnetism." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35358.

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In this paper we discuss some of our most important results in quantum nanomagnets in the last twenty years. We start with the tunnelling of the magnetic moment in single domain particles, then we will move to molecular magnets to explain both resonant spin tunnelling and quantum magnetic deflagration and we will finish discussing the quantum phenomena recently observed in vortices of two dimensional disks and in type I superconductors. Probably the most important question to answer in the cases presented in this paper refers to the possibility to detect both coherent phonons and photons

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32

Wang, Yiting. "Syntheses, Crystal Structures and Characterizations of Mono- and Polynuclear Ni- and Co-based Molecular Magnets." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS225.

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L’objectif consistant à élaborer des «aimants par conception» peut être atteint en adaptant les structures moléculaires des complexes de coordination. Les molécules conçues devraient présenter les caractéristiques requises pour des applications spécifiques, qui résultent de leur riche diversité structurale. Des complexes mononucléaires à base de Ni avec une grande anisotropie magnétique et des molécules polynucléaires à base de Ni et de Co sont préparés et étudiés dans cette thèse. Les synthèses, les études magnétiques et les propriétés électrochimiques des complexes contenant un ligand pontan

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33

Flores, Gonzalez Jessica. "Isotopic Enrichments of lanthanide based single molecule magnets." Thesis, Rennes 1, 2019. http://www.theses.fr/2019REN1S064.

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Les matériaux moléculaires, et plus précisément ceux à base d’ions lanthanides, ont été largement étudiés pour leur utilisation dans différentes applications, dont le stockage de l’information ou l’ordinateur quantique. Cet intérêt s’explique du fait que des systèmes contenant des ions lanthanides donnent lieu à une large anisotropie et une bistabilité magnétiques d‘origine purement moléculaire. Durant les vingt-cinq dernières années, beaucoup d’articles ont été publiés dans lesquels les composés à base de ces ions montraient une relaxation lente de leur aimantation et une hystérèse magnétique

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34

Ghannadzadeh, Saman. "Investigating magnetism and superconductivity using high magnetic fields." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:4b78618e-89a3-424e-a673-59d363a2605d.

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This thesis investigates a number of transition-metal coordination polymers and iron-pnictide superconductors through the use of high magnetic fields, low temperatures, and on occasion, high pressures. The thesis will begin by describing my development of the proximity detector dynamic susceptometer, a novel technique that can be used for magnetometery and transport measurements in high magnetic fields. This technique is highly compact and has no moving parts, making it suitable for use in pressure cells, hence opening the way for a variety of new experiments. Through high-field magnetometery

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35

Abbas, Ghulam [Verfasser], and A. [Akademischer Betreuer] Powell. "Synthesis and Characterisation of 4f and 3d-4f Molecular based Magnets / Ghulam Abbas. Betreuer: A. Powell." Karlsruhe : KIT-Bibliothek, 2009. http://d-nb.info/1014099048/34.

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36

Rodriguez, Garrigues Alvar. "Development of an Efficient Molecular Single-Electron Transport Spectroscopy." Master's thesis, University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5694.

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In this thesis I present a complete and detailed guide for the development process and fabrication of efficient single-electron transistors (SETs) and a better single-molecule magnets (SMMs) deposition yield. Starting from a commercial Si/SiO2 wafer I show the steps for the deposition of different layers to fabricate a SET as well as the improvements achieved in those for a completely functional SET device. The development process is based on a combination of optical lithography and e-beam lithography with metal deposition in ultra-high vacuum. The improvements involve a better conductance in

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Scherthan, Lena [Verfasser]. "Exploring hyperfine interactions and molecular vibrations of Dy and Fe containing single-molecule magnets using synchrotron-based nuclear resonant scattering / Lena Scherthan." Düren : Shaker, 2020. http://d-nb.info/1215461739/34.

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Cahier, Benjamin. "Étude théorique de l'anisotropie magnétique dans des complexes de métaux de transition : application à des complexes mono- et binucléaires de Ni(II) et Co(II)." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS070/document.

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Les molécules-aimants sont des complexes moléculaires contenant des ions des métaux de transition ou des lanthanides capables de présenter le phénomène de blocage de l’aimantation en dessous d’une température de blocage Tb. Ce blocage est dû à la présence d’une barrière d’énergie de réorientation de leur aimantation à cause de la présence d’une anisotropie magnétique uniaxiale qui conduit à la présence de deux états stables de l’aimantation.Ces deux états stables sont adressables avec un champ magnétique extérieur. Il est donc,théoriquement, envisageable d’utiliser ces molécules comme unités d

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Giménez, Agulló Nelson. "Synthesis of tetra-azaporphyrins, phthalocyanines and lanthanide double-decker sandwich complexes." Doctoral thesis, Universitat Rovira i Virgili, 2016. http://hdl.handle.net/10803/396305.

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Aquesta tesi compren la síntesi i l'estudi de diferents complexes amb estructrura de sandvitx de dos plantes formats per lantanids emprant tetrapirrolic macrocicles com a lligands. Els complexes resultants estan formats per la inclusió d'un ió lantanid entre dos anells de macrocicle. Els complexos amb aquestes estructures són coneguts per comportar-se com imàns moleculars formats per un sol centre metàl.lic. També es va aprofundir en l'estudi de l'equilibri de dimerizació d'una ftalocianina de zinc quiral en dissolució així com en la determinació de la seva constant de dimerització. La coordin

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Unge, Mikael. "Molecular Electronics : A Theoretical Study of Electronic Structure of Bulk and Interfaces." Doctoral thesis, Linköpings universitet, Beräkningsfysik, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-6938.

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This thesis deals with theoretical studies of the electronic structure of molecules used in the context of molecular electronics. Both studies with model Hamiltonians and first principle calculations have been performed. The materials studied include molecular crystals of pentacene and DNA, which are used as active material in field-effect transistors and as tentative molecular wires, respectively. The molecular magnet compound TCNE and surface modification by means of chemisorption of TDAE on gold are also studied. Molecular crystals of pentacene are reported to have the highest field-effect

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Ouyang, Jiangkun. "Helicenes for chiral molecular switches, magnetic materials, and chiral fullerene derivatives." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S160.

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Dans ce travail de thèse, nous avons d'abord développé deux études basées sur des unités dites ''stilbène rigide'' qui sont connues pour s'interconvertir de manière réversible entre deux formes trans et cis grâce à la lumière. La première étude correspond à des photocommutateurs chiraux à base d'hélicènes, l'autre à des complexes photocommutables alcynyles d'or(I). Ensuite, nous avons examiné la synthèse et la caractérisation de complexes de Dy(III) à base d'hélicène-bipyridine comme nouveaux types d'aimants moléculaires (SMM) chiraux et comparé la différence des propriétés magnétiques entre l

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42

Böhme, Michael [Verfasser], Winfried [Gutachter] Plass, Marek [Gutachter] Sierka, and Felix [Gutachter] Tuczek. "3d transition metal and lanthanide containing molecular magnets : a theoretical approach / Michael Böhme ; Gutachter: Winfried Plass, Marek Sierka, Felix Tuczek." Jena : Friedrich-Schiller-Universität Jena, 2019. http://d-nb.info/1207156663/34.

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Hornig, David [Verfasser], Winfried [Akademischer Betreuer] Plass, Stefanie [Akademischer Betreuer] Gräfe, and Felix [Akademischer Betreuer] Tuczek. "Experimental and theoretical investigations on transition metal and lanthanide containing molecular magnets / David Hornig. Gutachter: Winfried Plass ; Stefanie Gräfe ; Felix Tuczek." Jena : Thüringer Universitäts- und Landesbibliothek Jena, 2015. http://d-nb.info/1067098658/34.

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44

Guégan, Frédéric. "Joint experimental and theoretical approaches in coordination chemistry : from the trans effects to Single Molecule Magnets." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1267/document.

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Dans ce travail, nous nous sommes principalement intéressé à la description et à la rationalisation de certaines propriétés des complexes de coordination, par des approches mixtes expérience/théorie. La première de ces études, purement théorique, revisite les propriétés de coordination des ligands par des méthodes de type DFT conceptuelle. Dans un premier temps, les ligands seuls sont étudiés, puis les résultats de cette première approche sont utilisés pour caractériser et rationaliser les effets trans dans les complexes octaédriques. La deuxième étude ci-présentée concerne la synthèse et la c

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Datta, Subhadeep. "Propriétés de transport électronique de nanotubes de carbone remplis de particules magnétiques." Thesis, Grenoble, 2011. http://www.theses.fr/2011GRENY008.

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Les nanotubes de carbone (CNT) à basse température se comportent comme des points quantiques pour lesquelles les niveaux électroniques deviennent quantifiés. Le transport électronique à travers une jonction-CNT est caractérisé par le phénomène de blocage de Coulomb, dont les spécificités dépendent du couplage entre le nanotube et les électrodes métalliques. Le blocage de Coulomb est extrêmement sensible au moindre changement électrostatique, faisant des jonctions-CNT de précis électromètres. Par exemple, si l'on couple un système magnétique à un nanotube, le transport électronique sera influen

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Pontillon, Yves. "Étude de la densité de spin de composés magnétiques moléculaires par diffraction de neutrons polarisés." Université Joseph Fourier (Grenoble ; 1971-2015), 1997. http://www.theses.fr/1997GRE10220.

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Au cours de ce travail, nous avons applique la technique de la diffraction de neutrons polarises a l'etude de la densite de spin dans des composes magnetiques moleculaires. Nous avons tout d'abord etudie deux nitronyl nitroxydes presentant une structure en chaine via des liaisons hydrogenes : la densite de spin est majoritairement localisee dans une orbitale antiliante * construite sur les fonctions 2#p des atomes d'azote et d'oxygene des groupes nitroxydes. Par ailleurs, nous avons mis en avant le role primordial des liaisons hydrogenes dans le couplage ferromagnetique intermoleculaire, role

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Fernandez, Garcia Guglielmo. "Lanthanide-based SMMs : from molecular properties to surface grafting exploiting multi-level ab initio techniques." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S171/document.

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Cette thèse de doctorat a été réalisée en cotutelle entre les Universités de Rennes 1 en France et de Florence en Italie. L’objectif de ce travail est tout d’abord de rationaliser les propriétés inter- et intramoléculaires de molécules-aimants (Single Molecule Magnet – SMM) à base d’ions lanthanides (“partie moléculaire”) et puis leur évolution une fois absorbé sur surface (''partie sur surface''). Ces deux aspects ont été examinés dans un cadre théorique et computationnel, en utilisant différentes techniques multi-niveaux, de periodic Density Functional Theory (pDFT) en utilisant une approche

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Haque, Md Firoze. "CONTROLLED DEPOSITION OF MAGNETIC MOLECULES AND NANOPARTICLES ON ATOMICALLY FLAT GOLD SURFACES." Master's thesis, University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2109.

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In this thesis I am presenting a detailed study to optimize the deposition of magnetic molecules and gold nanoparticles in atomically flat surfaces by self-assembling them from solution. Epitaxially grown and atomically flat gold surface on mica is used as substrate for this study. These surfaces have roughness of the order one tenth of a nanometer and are perfect to image molecules and nanoparticles in the 1-10 nanometers range. The purpose of these studies is to find the suitable parameters and conditions necessary to deposit a monolayer of nano-substance on chips containing gold nanowires w

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Fegy, Karine. "Ingénierie de matériaux moléculaires magnétiques : complexes de radicaux libres nitronyl nitroxydes bis-bidentes ; synthèse, structure et magnétisme." Université Joseph Fourier (Grenoble ; 1971-2015), 1997. http://www.theses.fr/1997GRE10197.

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La chimie de coordination des radicaux libres nitronyl nitroxydes est propice aux composes moleculaires magnetiques (aimants moleculaires ou transitions de spin). Cependant le caractere base de lewis faible du groupe nitroxyde >n-o limite dans de nombreux cas leur utilisation aux ions metalliques porteurs de ligands attracteurs. Pour eviter ce probleme, nous avons choisi de substituer les radicaux par des groupes donneurs. Ce travail concerne la synthese, la caracterisation structurale et l'etude des proprietes magnetiques de complexes d'ions metalliques avec les radicaux nitronyl nitroxydes p

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Golze, Christian. "Tunable High-Field/ High-Frequency ESR and High-Field Magnetization on Single-Molecule Clusters." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2008. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1199739868406-44757.

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In this work, low dimensional iron group clusters have been studied by application of high magnetic fields. The magnetization has been probed with an MPMS as function of temperature and field. The combination with pulse field measurements up to 52\,T allowed determination of the magnetic exchange coupling parameters, and to probing the effective spin of the ground state. The main focus was on tunable high-field/high-frequency (tHF) ESR in static fields &lt; 17 T and pulse field ESR up to 36 T. This magnetic resonance method has been used for the characterization of the local magnetic prope

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