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.
Results
Showing 1 to 12 of 12 for “"hard magnetic"”.
-
Structural and magnetic characterization of Nd-based Nd-Fe and Nd-Fe-Co-Al metastable alloys
… the present work is to characterize a metastable hard magnetic phase referred to as "A1" in Nd-Fe alloys, which forms as a part of the fine eutectic depending on the composition and cooling rate. In order to define the range of composition for the formation of A1, Nd100-xFex (x = 20, 25, …
-
Modeling of magnetic field driven simultaneous assembly
The Magnetic Field Driven Simultaneous Assembly (MFDSA) is a method that offers a non-statistical and deterministic solution to the problem of assembly via batch processing; a hybrid of serial and parallel processing. The technique requires the use of electromagnets as well as soft and hard …
-
Epitaxial Nd-Fe-B films: Growth, texture, magnetism and the influence of mechanical elongation
… films using pulsed laser deposition for good hard magnetic properties. They are suitable for a basic understanding of the intrinsic magnetic properties. Compositional control was necessary to achieve phase formation with improved magnetic properties. Nd-Fe-B samples were prepared on single …
-
Synthesis, characterization and modification of carbon nanomaterials
… restricted to the nucleation process. Selective hard-magnetic functionalization of CNT tips has been achieved in a plasma-enhanced CVD process. Hard-magnetically terminated CNT, i.e. CNT with a FePt nanoparticle at each tip, are directly grown using FePt catalysts. Fe/Pt thin films with a …
-
Magneto-elastic behavior in hard- and soft-MRE's including demagnetizing effects
This thesis studies the magnetic and mechanical behavior of magnetorheological elastomers (MREs) based on four possible permutations defined along particle alignment (Aligned and Unaligned) and magnetization (Hard- or Soft-magnetic) pairs. These pairs designations yield classes A-H, U-H, A-S and …
-
Engineering bacterial magnetic nanoparticles
… alternative source of non-toxic biocompatible magnetic nanoparticles (MNPs). A magnetosome contains Fe2O4 magnetite with properties superior to MNPs synthesized by the traditional chemical route. However, synthesis of magnetosomes on large scale has not been achieved yet because magnetotactic …
-
Quantitative High-angle Annular Dark Field Scanning Transmission To Electron Microscopy For Materials Science
… reported by other workers. The L10 class of hard magnetic materials has attracted continuous attention as a candidate for high-density magnetic recording media, as this phase is known to have large magnetocrystalline anisotropy, with magnetocrystalline anisotropy constant, Ku, strongly …
-
Micromagnetic simulations of magnetic exchange spring systems
Magnetic exchange spring systems are multi-layers or composites of magnetically hard and soft materials that are exchange-coupled across their interfaces. In recent years, research into exchange spring systems has flourished, with potential for application in high-performance permanent magnets, GMR …
-
Analysis and Modeling of Magnetized Microswimmers: Effects of Geometry and Magnetic Properties
… has drawn much attention among researchers is magnetic microswimmers--artificial microrobots that propel in fluid environments by being actuated using rotating external magnetic fields. This dissertation highlights our contribution to this class of microrobots. We address issues regarding …
-
Growth, structure and magnetic properties of magnetron sputtered FePt thin films
The L10 FePt phase belongs to the most promising hard ferromagnetic materials for high density recording media. The main challenges for thin FePt films are: (i) to lower the process temperature for the transition from the soft magnetic A1 to the hard magnetic L10 phase, (ii) to realize c-axes …
-
The Design and Synthesis of Magnetic Nanocomposites
… discuss the synthesis and processing of multiple magnetic nanoparticle structures designed for the enhancement of various, application specific, properties. In the first experiments a tunable core/shell structure was developed with either enhanced optical properties or enhanced catalytic …
-
Microstructure and Texture of Yttrium-Nickel-Borocarbide and Samarium-Cobalt Thin Films
… width of 4K. In the second part of this work, hard magnetic Sm-Co/Cr films were epitaxially grown on MgO(100) and (110) substrates. They were characterized by X-ray pole figure measurements and transmission electron microscopy. For films deposited on MgO(100) at 700ºC, orientations are found …