Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 36 for “"magnetic force microscopy"”.
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Magnetic force microscopy studies of mesoscopic superconducting structures
… This dissertation describes a new mode of magnetic force microscopy (Φ0-MFM) for investigating vortex and fluxoid sates in mesoscopic superconducting (SC) structures. The technique relies on the magneto-mechanical coupling of a MFM cantilever to the motion of fluxons. The novelty of the …
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Study of current measurement in magnetic force microscopy
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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Magnetic structure in manganites as probed by magnetic force microscopy
This dissertation describes the use of magnetic force microscopy to directly measure the magnetic structure of a sample on a microscopic level. Our magnetic force microscope has been operated at temperatures ranging from 293 to 4.3 K and fields ranging from 0 to 3 T, providing a method for imaging …
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Imaging vortex dynamics in Josephson arrays using magnetic force microscopy
… the vortex motion. Using a technique based on magnetic force microscopy, we can directly measure the resonant motion of vortices present in a superconducting lattice. We use a scanning magnetic tip to trap a small number of vortices in a superconducting Josephson junction array near the tip. By …
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A data storage system based on patterned magnetic media and magnetic force microscopy
… systems. Periodic arrays of nanostructured magnetic pillars have been proposed as a patterned medium for high density data storage. In patterned media, each single domain magnetic pillar is used to store one bit of data. This media can theoretically provide an extremely high recording …
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Low-temperature magnetic force microscopy with a simple design: analyzing the magnetic domains of a simple hard disk drive
… introduces the theoretical background for the Magnetic Force Microscope (MFM) and the theoretical basis for magnetic domains. The second part will address issues we have come across on previous designs and how our newer design overcomes these issues. Along with the construction of our low …
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Theoretical studies of stray field images of magnetic systems
Research in magnetic recording is currently at a stage where an understanding of the magnetic microstructure of recording media is vitai for the continual improvement in recording performance and the achievement of higher recording densities. Experimental techniques such as Lorentz Imaging and …
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CRYOGENIC ATOMIC FORCE MICROSCOPE FOR CHARACTERIZATION OF NANOSTRUCTURES
… design and applications of a cryogenic atomic force microscope (AFM) for characterization of nanostructures. The cryogenic AFM with a conductive tip can measure DC current through nanostructures. We use quartz tuning fork (QTF) as the force sensor. Unique coarse z motor design provides reliable …
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Magnetic properties of lithographically patterned thin film magnetic elements for magnetic random access memory applications
… With the aim of assessing the behavior of future magnetic random access memory (MRAM) devices, the magnetic properties of the patterned elements, including magnetization switching mechanisms, switching field distribution, magnetic thermal stability, and magnetostatic interactions, have been …
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Nano-imaging to Determine the Interstitial Nature of Mn(II) Doping in 2D Halide Perovskites
… Torma By performing correlated nanoscale X-ray microscopy, temporally resolved photoluminescence measurements, and magnetic force microscopy on the inorganic 2D perovskite Cs2PbI2Cl2, we show that doping Mn2+ into the structure results in a lattice expansion. The observed lattice expansion …
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Fabrication, characterization, and micromagnetic analysis of lithographically defined particle arrays for applications in data storage
In this thesis, the magnetic behavior of nanostructured ferromagnetic particle arrays are studied by experiments and numerical micromagnetics for ultra-high-density data storage applications. 1 00nm or 200nm period arrays of nanostructured nickel, cobalt, and cobalt phosphorus are fabricated by the …
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Fabrication and characterization of nanostructured magnetic particles for applications in data storage
Arrays of nanostructured magnetic particles ('nanomagnets') have potential applications in ultra-high-density data storage devices and dynamic magnetic memories, and are model systems for the study of magnetic phenomena at deep sub-micron length scales. We use interference lithography to pattern …
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Imaging magnetic order in magneto-structural phases of Mn3O4
… geometry, strong spin-lattice coupling and magnetic interactions. Mn3O4 is known to have two distinct phases below the Neel temperature that differ in both structure and magnetic order, including a tetragonal phase with disordered spins, and at lower temperatures, an orthorhombic phase …
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Real-space magnetic imaging of the spinel MnV2O4
… understand the underlying physics, we performed magnetic force microscopy measurements on two MnV2O4 samples with differing degrees of mechanical strain. These local investigations revealed sub-um-scale patterns in the magnetic structure in both samples. In one case, the magnetization of these …
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Scanning probe investigations of magnetic thin films and nanostructures
Magnetic thin films and nanostructures, like nanoparticles and molecules, have unique transport properties considering their ability to eject spin polar-ised currents. In this work, the possibilities to make these properties accessi-ble by means of scanning probe microscopy have been investigated. …
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Pattern formation and magnetism in pulsed laser-induced self-organized nanostructures from single and bilayer metallic films
… these resulting structures are related to their magnetic, optical, plasmonic, and magneto-optical properties, such as in high density magnetic storage, energy harvesting, and sensing. In this dissertation experimental and theoretical mechanisms of nanoscale patterning by dewetting …
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Skyrmions and non-collinear magnetic domains in Fe₃GeTe₂
… der Waals (vdW) material known to host nanoscale magnetic whirlpools called skyrmions. The vdW nature of Fe3GeTe2 means we can exfoliate 2D layers that can be easily incorporated into a wide range of devices. Behaving as particles that can be manipulated, skyrmions are potentially useful for …
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Filmes de FePt para dispositivos da spintrônica
The present study deals with magnetic and transport properties in the L10 FePt compound. The compound has tetragonal structure and strong magnetocrystalline anisotropy. Films were prepared by sputtering. For measuring Tunnel Anisotropic Magnetoresistance (TAMR), FePt/AlOx/Au trilayers were …
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Magnetic properties of block-copolymer fabricated cobalt nanodots and nanowires at elevated temperatures
… scale are useful for electrical, optic, and magnetic applications such as memory storage. Using block copolymer fabrication methods, 60nm diameter cobalt nanodots and 37nm wide cobalt nanowires were created, both with heights of 20nm. To characterize the reliability of the nanodots, magnetic …
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Wide-field magnetic field imaging with nitrogen vacancy centers in nanodiamonds at high frame-rates
… polarization, readout and optically detected magnetic resonances (ODMR). The NV has been shown to be a sensitive magnetometer at room temperature. In particular, owing to their small size, NV centers in nanocrystals (nanodiamonds) offer magnetic field imaging with high spatial resolution. …
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