Sökning: "magnetization switching"

Visar resultat 11 - 15 av 22 avhandlingar innehållade orden magnetization switching.

  1. 11. Dynamics and Intrinsic Variability of Spintronic Devices

    Författare :Corrado Carlo Maria Capriata; B. Gunnar Malm; Per-Erik Hellström; Dan Kuylenstierna; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Spintronics; micromagnetic simulations; SHNO; MTJ; microwave measurements; realistic simulations; low-temperature measurements; fabrication; grains; Spinntronik; mikromagnetiska simuleringar; SHNO; MTJ; mikrovågsmätningar; realistiska simuleringar; lågtemperaturmätningar; nanotillverkning; korn; Informations- och kommunikationsteknik; Information and Communication Technology;

    Sammanfattning : Spintronics is a scientific domain focusing on utilizing electron spin for information processing. This is the element that distinguishes it from electronics, which only utilizes the charge of electrons. LÄS MER

  3. 12. Magnetic deflagration and detonation in crystals of nanomagnets

    Författare :Oleksii Iukhymenko; Claude Dion; Javier Tejada; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Nanomagnets; magnetic deflagration; front instability; Zeeman energy; magnetic instability; magnetic detonation; weak detonation; Physics Of Matter; materiefysik;

    Sammanfattning : In this thesis we cover the dynamics of the macro magnetic transformations (spin avalanches) in crystals of molecular nanomagnets, also known as magnetic deflagration and detonation.Taking a single-molecule Hamiltonian, we calculate the dependence of Zeeman energy and the activation energy as a function of an external magnetic field at different angles relative to the easy axis of the crystal. LÄS MER

  4. 13. First-principles Studies of Local Structure Effects in Magnetic Materials

    Författare :Marcio Costa; Anders Bergman; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; magnetic anisotropy; DMFT; magnetism; DFT; Materialvetenskap; Materials Science;

    Sammanfattning : This thesis focus on the magnetic behavior, from single atoms to bulk materials. The materials considered in this thesis have been studied by computational methods based on ab initio theory, density functional theory (DFT), including treatment of the spin-orbit coupling, non-collinear magnetism, and methods capable of treating discorded systems. LÄS MER

  5. 14. Memory Effects on Iron Oxide Filled Carbon Nanotubes

    Författare :Carlos Cava; Clas Persson; Lucimara Roman; Krister Svensson; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Memory devices; Carbon Nanotubes; energy; nanotechnology; Iron Oxide;

    Sammanfattning : In this Licentiate Thesis, the properties and effects of iron and iron oxide filled carbon nanotube (Fe-CNT) memories are investigated using experimental characterization and quantum physical theoretical models. Memory devices based on the simple assembly of Fe-CNTs between two metallic contacts are presented as a possible application involving the resistive switching phenomena of this material. LÄS MER

  7. 15. Titled and graded anisotropy FePt and FePtCu thin films for the application of hard disk drive and spin torque oscillators

    Författare :Yeyu Fang; Johan Åkerman; Anna Delin; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik;

    Sammanfattning :  The FePt and FePtCu thin films with graded anisotropy and titled anisotropy are utilized to solve both the magnetic recording ‘‘trilemma’’ of the hard disk drives (HDDs) and the large field operation problem of spin torque oscillators (STOs). We have successfully realized the FePtCu thin films with graded anisotropy. LÄS MER