Essays about: "magnetic vortex"

Showing result 1 - 5 of 9 essays containing the words magnetic vortex.

  1. 1. Transient Dynamics and Core Tunneling in Vertical Spin-Vortex Pairs

    University essay from KTH/Nanostrukturfysik

    Author : Milton Persson; [2019]
    Keywords : Spin-vortex; ultra fast vortex dynamics; milli-Kelvin temperatures; macroscopic quantum tunneling; Spinnvirvel; ultrasnabb virveldynamik; milli-Kelvin temperaturer; makroskopisk kvanttunnling;

    Abstract : Spin-vortices in vertically spaced pairs of thin elliptical Permalloy nanoparticles are investigated. The two vortex cores with parallel out-of-plane magnetization exhibit a strong monopole-like attraction through the spacer much thinner than the core length, thus forming a bound core-core pair. READ MORE

  2. 2. Micromagnetic simulations of magnetization dynamics in iron-palladium nanostructure arrays

    University essay from Uppsala universitet/Materialfysik

    Author : Agne Ciuciulkaite; [2016]
    Keywords : micromagnetic simulations; magnetization dynamics; iron-palladium circular islands; ferromagnetic resonance;

    Abstract : Previous investigations of FePd circular island arrays have shown the hysteresis-free switching from vortex to collinear magnetic state at high temperatures [1]. This raises interest in the exploration of the temperature and inter-island interaction effect on the magnetization dynamics in this kind of structures. READ MORE

  3. 3. Micromagnetic simulations for the investigation of magnetic vortex array dynamics

    University essay from Uppsala universitet/Materialfysik

    Author : Agne Ciuciulkaite; [2016]
    Keywords : micromagnetic simulations; ferromagnetic resonance; magnetic vortex; permalloy circular islands;

    Abstract : In this work the dynamics of permalloy circular magnetic islands of 225 nm radius and 10 nm thickness arranged into square lattices was investigated employing micromagnetic simulations.The simulations of the vortex magnetization loops and the ferromagnetic resonance (FMR) spectra were carried out using a free micromagnetics simulation software Mumax3. READ MORE

  4. 4. Dynamics of magnetic nanostructures

    University essay from Uppsala universitet/Materialfysik

    Author : Julia Liljestrand; [2016]
    Keywords : Spin ice; Micromagnetism; Simulations;

    Abstract : Magnetic nanostructures provide the opportunity to investigate a number ofmagnetic phenomena, and are of interest for their possible future applicationsin technology. In this project, the ferromagnetic response (FMR) of magnetic nanostructures to an electromagnetic excitation has been investigated using the micromagnetic simulations program Mumax3. READ MORE

  5. 5. Detection of electron vortex beams : Using a scanning transmission electron microscope

    University essay from Uppsala universitet/Materialteori

    Author : André Löfgren; [2015]
    Keywords : microscopy; electron; vortex; beam; microscope; detection; detecting; doughnuts; microscopy; STEM; scanning; transsmision; mikroskopi; elektronvirvelstråle; elektronvirvelstrålar; elektron; stråle; virvel; munk; munkar; elektrontransmissionsmikroskop; elektronmikroskop; transmissionsmikroskop; detektera; detektering;

    Abstract : Electron vortex beams (EVBs) are electron beams with a doughnut-like intensity profile, carrying orbital angular momentum due to their helical phase shift distribution. When employed in an electron microscope, they are expected to be efficient for the detection of magnetic signals. READ MORE