Sökning: "magnetic percolation"

Visar resultat 1 - 5 av 7 avhandlingar innehållade orden magnetic percolation.

  1. 1. Electronic Structure and Statistical Methods Applied to Nanomagnetism, Diluted Magnetic Semiconductors and Spintronics

    Författare :Lars Bergqvist; Olle Eriksson; Warren Pickett; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; spintronics; magnetism; Monte Carlo; critical temperature; exchange interactions; percolation; disorder; noncollinear; electronic structure; Materialvetenskap; Materials science; Teknisk materialvetenskap;

    Sammanfattning : This thesis is divided in three parts. In the first part, a study of materials aimed for spintronics applications is presented. More specifically, calculations of the critical temperature in diluted magnetic semiconductors (DMS) and half-metallic ferromagnets are presented using a combination of electronic structure and statistical methods. LÄS MER

  3. 2. Density Functional Theory Applied to Materials for Spintronics

    Författare :Diana Mihaela Iusan; Olle Eriksson; Biplab Sanyal; Hiroshi Katayama-Yoshida; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; spintronics; dilute magnetic semiconductors; density functional theory; exchange interactions; magnetic percolation; ordering temperature; disorder; electronic structure; Physics; Fysik; Materialvetenskap; Materials Science;

    Sammanfattning : The properties of dilute magnetic semiconductors have been studied by combined ab initio, Monte Carlo, and experimental techniques. This class of materials could be very important for future spintronic devices, that offer enriched functionality by making use of both the spin and the charge of the electrons. LÄS MER

  4. 3. Magnetically governed self-assembly of soft matter : A look into interfacial layering, crystallization and percolation

    Författare :Apurve Saini; Max Wolff; Vassilios Kapaklis; Pietro Tierno; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Self-assembly; Soft matter; Colloids; Magnetic nanoparticles; Ferrofluid; Solid-liquid interface; Neutron reflectometry; Electrical sensing; Microcontact; Materiefysik; Physics of Matter;

    Sammanfattning : Self-organisation is the key route for assembling colloidal particles into well-defined structures. Decisive for this are the interactions between the constituents, which are amongst others steric, electrostatic or magnetic. LÄS MER

  5. 4. Dynamics of complex magnetic systems

    Författare :Kristian Jonason; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; Materialvetenskap; Materials science; Teknisk materialvetenskap; Solid State Physics; fasta tillståndets fysik;

    Sammanfattning : Dynamic magnetic properties of disordered and frustrated magnetic systems have beenexperimentally investigated utilising SQUID (Superconducting Quantum Interference Device)magnetometry. The studied systems are spin glasses, reentrant ferromagnets, reentrantantiferromagnets and diluted Ising antiferromagnets. LÄS MER

  7. 5. Local structure in disordered materials studied by neutron scattering and RMC modelling

    Författare :Liselotte Karlsson; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Nuclear physics; Local structure; neutron scattering; RMC modelling; metallic glasses; high Tc; superconductors; fast ion conductors; Kärnfysik; Nuclear physics; Kärnfysik; Physics Of Matter; materiefysik;

    Sammanfattning : Different disordered materials are becoming more and more important in various technological applications. There is a need to improve our detailed understanding of the local structure of such materials and how the atomic structure is related to macroscopic physical properties. LÄS MER