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Showing 1 to 18 of 18 for “"magnetic domain walls"”.
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Magnetic domain walls driven by interfacial phenomena
A domain wall in a ferromagnetic material is a boundary between differently magnetized regions, and its motion provides a convenient scheme to control the magnetization state of the material. Domain walls can be confined and moved along nanostrips of magnetic thin films, which are proposed …
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Magnetic domain walls in ultrathin films : contribution of the Dzyaloshinsky-Moriya interaction
In this theoretical thesis the structure of magnetic domain walls is explained by an interplay of spin stiffness, anisotropy energy and Dzyaloshinsky-Moriya interaction. The wall structures are discussed within a micromagnetic model and the corresponding model parameters are obtained ab initio by …
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Structure and dynamics of magnetic domain walls in multi-sublattice magnetic oxides
… is a study that lies at the intersection of magnetics and electronics, which makes use of the electron spin in solid-state devices for data storage and manipulation. A promising future spintronic technology is racetrack memory, where magnetic domain walls (DWs) are encoded with bits of …
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Magnetic domain walls for on-chip transport and detection of superparamagnetic beads
Surface-functionalized superparamagnetic (SPM) microbeads are of great interest in biomedical research and diagnostic device engineering for tagging, manipulating, and detecting chemical and biological species in a fluid environment. At the same time, lab-onchip technologies have grown popular due …
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Nanomagnetismus von epitaktischen Fe(110)- und CrO 2 (100)-Strukturen im Hinblick auf potentielle spinelektronische Anwendungen
… developed. The combination of electronic and magnetic properties within so called spinelectronic or magnetoelectronic devices plays a key role in this area of research and technology. With the development of magnetic random access memories and magnetic-field sensors based on submicron magnetic …
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Magnetic logic circuits with high bit resolution for hardware acceleration
… circuits. We explore a logic device based on magnetic domain walls, which are electrically movable boundaries between oppositely magnetized domains of a wire, for applications to hardware acceleration. A domain wall logic device takes current on the input, which moves a magnetic domain wall to …
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Static and dynamic properties of magnetic Skyrmions in engineered multilayer films
Magnetic textures known as skyrmions promise new breakthroughs in memory, logic, and neuromorphic applications. Skyrmions have been found in a variety of material systems, yet there existed no experimental evidence of a material that could simultaneously host them at room temperature and also allow …
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Aspects of Dzyaloshinskii-Moriya Interaction in Two Dimensional Magnetic Structures
Research on topologically protected chiral magnetic structures such as magnetic domain walls (DWs) and skyrmions, have gained extensive interest because of their possible applications in magnetic data storage industries. The recently observed chiral DW structures in ultrathin ferromagnetic lms with …
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Manipulation of spin textures by unconventional spin torques
… of nonuniform magnetization textures such as domain walls and skyrmions provide both a means to control magnetism in devices, and to gain new fundamental insights into spin-charge and spin-orbital interactions in magnetic materials. In this thesis, we examine novel mechanisms for the evolution …
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Harnessing Magnetic Switching and Dynamics Using Electron and Magnon Spin Currents
… information require effective control of the magnetic orientation and dynamics in magnetic materials, which can be realized by the interactions between magnetic moments and spin currents. In this thesis, we explore two types ofspin currents, as carried by conduction electrons and magnons, …
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Geometrical control of domain walls and the study of domain wall properties of materials with perpendicular magnetic anisotropy
Magnetic based devices such as hard disk drives (HDDs) are widely used in the computer industry because of their high memory capacity, non-volatility and low cost compared to semiconductor-based solid state disk drives (SSDs). However, they also suffer from low energy efficiency and low speed, due …
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An Investigation of the Structural and Magnetic Transitions in Ni-Fe-Ga Ferromagnetic Shape Memory Alloys
The martensite and magnetic transformations in Ni-Fe-Ga ferromagnetic shape memory alloys are very sensitive to both alloy chemistry and thermal history. A series of Ni-Fe-Ga alloys near the prototype Heusler composition (X2YZ) were fabricated and homogenized at 1423 °K, and a Ni₅₃Fe₁₉Ga₂₈ alloy …
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Direct writing of three-dimensional nanostructures and their application in nanomagnetism
… In particular, the effect of 3D geometry on the magnetic domain walls and their dynamics have been studied. The purely geometry-driven domain wall motion in the fabricated 3D domain wall conduits has been experimentally demonstrated, offering a route towards fast, robust and energy efficient …
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Magnetic Detection of Microstructural Change in Power Plant Steels
… relating the microstructural state to measurable magnetic properties. Magnetic domain walls interact energetically with microstructural features such as grain boundaries, carbides and dislocations, and are ‘pinned’ in place at these sites until a sufficiently large field is applied to free them. …
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Characterisation of focused ion beam nanostructures by transmission electron microscopy
… the modifcation and control of the properties of magnetic thin films. Basic magnetic properties such as coercivity and local anisotropy direction can be altered in NiFe (Permalloy) films, whilst for Co/Pd multilayers, ion irradiation results in a transition from perpendicular to in-plane …
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Exploring the interplay between topological order, magnetism and superconductivity
… gate voltage) and spin imbalance (applied magnetic field). We find that the helical nature of the edge state gives rise to orders that are expected to be absent in non-chiral one-dimensional electronic systems. For repulsive interactions, the ordered state has an oscillatory spin texture …
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The Interplay of Magnetism and Topology in Topological Insulators
… of magnetism into TIs focused on doping TIs with magnetic adatoms, or engineering magnetic insulator/TI interfaces to induce magnetism into the TI edge states through a proximity effect. However, as was the case with bare TI devices, fabricating devices based on such platforms is not without …