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Showing 1 to 20 of 89 for “"magnetic anisotropy"”.
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Manipulation of magnetic anisotropy in nanostructures
Of late, the magnetic properties of micro/nano-structures have attracted intense research interest both fundamentally and technologically particularly to address the question that how the manipulation in the different layers of nanostructures, geometry of a patterned structure can affect the …
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Antiferromagnetic nanodiscs with perpendicular magnetic anisotropy for biological applications
Abstract Magnetic particles have been widely implemented across research areas in liquid and biological environments, such as cancer therapy, drug delivery and cell sorting. Perpendicularly magnetised (PM) synthetic antiferromagnetic (SAF) particles exhibit a range of desirable properties that make …
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Electron Transport via Single Molecule Magnets with Magnetic Anisotropy
… been achieved, offering a new method to examine magnetic properties of individual SMMs. In this thesis, two types of SMMs, specifically Eu2(C8H8)3 and Ni9Te6(PEt3)8, are theoretically investigated by simulating their electron transport properties within three-terminal transistor set-ups. An …
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Nitrosoarenes: magnetic anisotropy, donor-acceptor bonding and host-guest chemistry
… our studies focuses on the very large (2-3 ppm) magnetic anisotropy of the nitroso group, which is evaluated for a series of ortho-substituted nitrosoarenes. The nitroso (-N=O) functions of these molecules are sterically forced into a primary (majority) orientation in the molecule by the ortho …
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Perpendicular magnetic anisotropy in ion beam sputtered Co/Ni multilayers
Co/Ni multilayers display perpendicular magnetic anisotropy and have applications in magnetic devices that could lead to a large increase in the density of magnetic storage. Co/Ni 10-(2 Å Co/ 8Å Ni) and 10-(2 Å Co/ 4 Å Ni) multilayers were deposited with ion beam sputtering on either ion beam …
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Self-assembly of ferromagnetic micro/nano-particles with perpendicular magnetic anisotropy
Magnetic particles offer an interesting platform for self-assembly, as their dipolar interactions and response to magnetic fields can be used to drive and manipulate assembly. Many magnetic particles used so far in these applications are quite simple in their properties, such as iron oxide …
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Ab initio study of magnetic anisotropy of M-type hexaferrite thin films
… show particular promise as very high density magnetic and magneto-optical datastorage media. There are still serious gaps in the understanding ofthe fundamental origins of, and mechanisms governing, the magneticproperties of these materials. The detailed relationships between theseproperties …
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Growth-Induced Cation Order and Magnetic Anisotropy Engineering in Iron Garnet Thin Films
… devices, which encode data in a material’s magnetic state, offer a promising solution. Magnetic memory technologies are widespread today, powering devices such as memory disks, tapes, and magnetic random access memory (MRAM). While garnet materials have long been studied for these …
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Misfit accomodation in thin films of Ni/Cu as measured by magnetic anisotropy
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1995.
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Iron-gallium alloys : temperature and field effects on [lambda]100 and magnetic anisotropy measurements
… temperature. In addition, room temperature magnetic anisotropy measurements were conducted on samples between 8% Ga and 25% Ga. No major hysteresis was found in any of the samples and the field dependence was found to be modest (-2%). Anomalous temperature dependence was found in 22-24% …
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Fabrication and characterization of perpendicular magnetic anisotropy thin-film CoCrPt grown on a Ti underlayer
… storage technology because of its perpendicular magnetic anisotropy (PMA) characteristics. An underlayer can be used to ensure the out-of-plane magnetization required for PMA functionalities. Ti, with a lattice constant of a = 2.95 Å can be used to encourage uniaxial c-axis growth in CoCrPt …
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Magnetic anisotropy in epitaxial Ni/Cu (001) thin films and Cu/Ni/Cu (001) sandwiches
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1995.
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Metastability of Magnetic Nanoparticles in Magnetization Relaxation with Different Dynamics and Distributions of Magnetic Anisotropy
We study the metastability of magnetic nanoparticles with size distributions. We simulate an array of magnetic nanoparticles with a spin S = 1 ferromagnetic Blume-Capel model on a square lattice. Studying decays of the metastable state in the Blume-Capel model at low temperatures requires an …
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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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Study of Systematic Error in Biaxial Torque, and Magnetic Characterization of Strontium Ferrite
Magnetic anisotropy (MA) describes how the magnetic properties of materials, such as ferri- and ferromagnetic thin films and composites, change with the field angle. To determine a sample’s magnetic anisotropy constant, torque curves are used, obtained either directly with a torque magnetometer …
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Spin and Charge Transport in Metallic Ferrimagnets and Disordered Magnetic Oxides
… thin film synthetic ferrimagnets and disordered magnetic oxides for applications in spintronic devices. Due to the antiferromagnetic exchange interaction, ferrimagnetic materials offer the ultrafast dynamics of the antiferromagnetic exchange, with a net magnetization that can be influenced …
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Chemical Correlation of Magnetic Permeability and Microwave Absorption in Spinel Ferrite Nanoparticles
… (MFe₂O₄, where M = Mn²⁺, Co²⁺, Zn²⁺, etc.) are magnetic nanomaterials with tunable properties that are valuable for wireless communication, memory storage, and electronics. Their complex permeabilities that are governed by composition, particle size, and spin-orbit interactions play a critical …
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Thin film magnetics for integrated magnetic nano-structures
… seen a surge in demand for highly miniaturised magnetic components which has been enabled by use of power circuitry high switching frequencies which require energy storage on a smaller scale. The optimal scale of this integration will be achieved with the complete integration of the power supply …
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DEVELOPMENT OF MAGNETO-OPTIC SENSORS WITH GALLIUM IN BISMUTH DOPED RARE-EARTH IRON-GARNET THICK FILMS
… We used lutetium to control the film's in-plane magnetic properties and found that gallium doping levels above the compensation point caused a loss of anisotropy control, a canted out-of-plane magnetization in the film, and an extremely weak but linear coercivity above 10 micro-Tesla fields. …
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