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 “"magnetoelastic"”.
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Magnetoelastic coupling in thin films
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1994.
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Growth and magnetoelastic behavior of b-axis-oriented dysprosium
… behavior is interpreted in terms of fundamental magnetoelastic interactions and shape anisotropy.
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Magnetoelastic couplings in epitaxial Cu/Ni/Cu/Si(001)
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1999.
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Neutron scattering investigations of spinel ferrimagnets: symmetry and magnetoelastic domain wall patterning
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-12-01
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Magnetic and magnetoelastic phenomena in rare earth dysprosium/lutetium superlattices and thin films
… nearly 100%. In addition, microscopic domains of magnetoelastic distortion appear at T$\sb{\rm c}$, reducing the local symmetry of the structure from hexagonal to orthorhombic. Similar phenomena are found to occur in Lu/Dy/Lu trilayer films, which suggests that epitaxially induced stresses and …
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Development and Validation of a Bidirectionally Coupled Magnetoelastic FEM Model for Current Driven Magnetostrictive Devices
A bidirectionally coupled magnetoelastic model (BCMEM) has been extended to include electric currents in its magnetic finite element formulation. This enables the model to capture the magnetoelastic behavior of magnetostrictive materials subjected to elastic stresses and magnetic fields applied not …
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Design of materials with small magnetic hysteresis: the unexpected role of magnetostriction.
… that the inclusion of magnetostriction (i.e. magnetoelastic energy) alters the nucleation barrier, compelling the magnetization to follow alternative reversal paths that comply with strain compatibility conditions and this results in reduced coercivity. These alternative magnetization paths …
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The Development of a Novel Figure of Merit to Analyze Strain-Mediated Magnetoelectric Antennas
Strain-mediated magnetoelastic composite materials are being considered for communication in lossy environments. Their consideration is attributable to predictions stating order of magnitude improvements over current antenna technology. The magnetic antenna design considered herein consists of …
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Modifying the magnetic properties of Laves phase intermetallic multilayers and films by nano-patterning and ion implantation
… At a fluence of ~ 1017 Ar+ ions cm-2, the magnetoelastic anisotropy (dominant at room temperature in the epitaxially grown films) is reduced to such an extent that the intrinsic magnetocrystalline anisotropy begins to dominate. Thus Ar+ ion implantation serves to alter the easy and hard …
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Detection of antiferromagnetic domain reversal in epitaxial insulating oxides
… To achieve this, we experimentally elucidate the magnetoelastic relaxation mechanism that governs magnetic field-driven antiferromagnetic domain reversal. This approach, with our analytical model for the field-induced response, reveals the role of the film magnetostriction and anisotropy. With …
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TIME-DOMAIN INVESTIGATION OF ACOUSTICALLY AND THERMALLY DRIVEN MAGNONS
… magnetization dynamics of the Ni thin films via magnetoelastic coupling. In a second experiment, the TG approach has been exploited to drive coherent magnons at a selected wavevector non-relying on the magnetoelastic coupling but rather on the spatially modulated temperature profile generated by …
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Vibration Energy Harvesting for the Development of autonomous monitoring Systems. Application to railway Bridges
… and validation of piezoelectric (PEH) and magnetoelastic (MEH) energy harvesters, with particular emphasis on their application to railway bridges. Analytical lumped-parameter models are derived from a variational formulation for bimorph and unimorph cantilever configurations, enabling the …
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Structural and magnetic properties of erbium thin films and Er/Y superlattices
… to the Y lattice, leads to a reduction of the magnetoelastic energy that drives the ferromagnetic transition. The dependence of the magnetoelastic energy on the epitaxial strain is described by a model which accounts for the elastic coupling of the erbium lattice to the yttrium. In addition, …
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EXPLORATION OF NEW MULTIFUNCTIONAL MAGNETIC MATERIALS BASED ON A VARIETY OF HEUSLER ALLOYS AND RARE-EARTH COMPOUNDS
Magnetic, magnetocaloric, magnetotransport and magnetoelastic properties of Ni-Mn-X (X = In, and Ga) Heusler alloys and La-Fe-Si based rare earth compounds have been synthesized and investigated by x-ray diffraction, magnetization, strain, and electrical resistivity measurements. The phase …
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Interaction of stress and magnetic properties in patterned copper-nickel-copper thin films
… This transition is explained by the dominant magnetoelastic energy for the Cu/Ni/Cu nanoline system.
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Magneto-Elastic Interactions in a Cracked Ferromagnetic Body
… solution. As a result of this investigation, the magnetoelastic stress intensity factor is obtained and its dependency upon the crack velocity, material constants and nonlinear law of magnetization are highlighted. It has been shown that stress result around the crack essentially depend on …
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Residual stress measurement in railroad car wheels
… of the measurement technology to the use of magnetoelastic stress measurement is proposed. To evaluate the inaccuracy in stress data possible from a large sample with curved surface, corrections for a deliberate tilt of the plane of the x-ray diffractometer from the normal to the sample …
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