Sökning: "Heterostructures"

Visar resultat 1 - 5 av 76 avhandlingar innehållade ordet Heterostructures.

  1. 1. Magnetic Heterostructures The Effect of Compositional Modulation on Magnetic Properties

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Inna Soroka; Uppsala universitet.; [2005]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; Magnetism; Sputter deposition; Superlattice; Multilayers; Materialvetenskap; TECHNOLOGY Materials science; TEKNIKVETENSKAP Teknisk materialvetenskap;

    Sammanfattning : The effect of compositional modulation on structural and magnetic properties of magnetic heterostructures was explored. The systems under focus were ferromagnetic superlattices Fe81Ni19/Co, metal-insulator multilayers Al2O3/Ni81Fe19, nanoparticles and artificial multilayered pillars. LÄS MER

  2. 2. Metamorphic Heterostructures and Lasers on GaAs

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Ivar Tångring; [2008]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; metamorphic heterostructures; InGaAs quantum well; graded buffer layer; Semiconductor laser; GaAs; molecular beam epitaxy; telecom laser;

    Sammanfattning : The objective of this thesis is to demonstrate the metamorphic growth of heterostructure lasers on GaAs substrates. Many heterostructure devices have their performance limited by the need to grow on lattice-matched substrates. LÄS MER

  3. 3. Properties of Fe/ZnSe Heterostructures A Step Towards Semiconductor Spintronics

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Fredrik Gustavsson; Uppsala universitet.; [2002]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; semiconductor spintronics Fe ZnSe heterostructures spin injection interface magnetism magnetic tunnel junctions; Fysik; NATURAL SCIENCES Physics; NATURVETENSKAP Fysik; Fysik; Physics;

    Sammanfattning : In the present thesis, the properties at ferromagnet/semiconductor interfaces, relevant for semiconductor spintronics applications, are addressed. Semiconductor spintronics refers to the possibility of storing information using the electron spin, additional to the electron charge, for enhanced flexibility in nanoscale semiconductor devices. LÄS MER

  4. 4. Optimization of Metamorphic Materials on GaAs Grown by MBE

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Yuxin Song; [2010]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; molecular beam epitaxy; GaAs; InGaAs; threading dislocation; alloy graded buffer; heterostructures; metamorphic;

    Sammanfattning : Advanced epitaxial technologies such as molecular beam epitaxy (MBE) and metal-organic vapor phase epitaxy (MOVPE) have enabled the idea of semiconductor heterostructures, which built up the foundation of the fast developing information and communication technology nowadays. Lattice mismatch has been a problem limiting designs of semiconductor heterostructures. LÄS MER

  5. 5. Semiconductor Hetero- and Nanostructures

    Detta är en avhandling från Solid State Physics

    Författare :Jonas Ohlsson; Lunds universitet.; Lund University.; [2001]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Heterostructures; Nanowhiskers; Semiconductory physics; Chemical Beam Epitaxy; Nanostructures; Halvledarfysik; Fysicumarkivet A:2001:Ohlsson;

    Sammanfattning : In this thesis, chemical beam epitaxy was used to fabricate nm-sized crystalline structures. Most of the systems were based on heterostructures, i.e., combinations of different kinds of crystalline materials. LÄS MER