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 58 for “"ferromagnets"”.
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Continuous-spin Ising ferromagnets.
Thesis. 1976. Ph.D.--Massachusetts Institute of Technology. Dept. of Mathematics.
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Magnetostriction in ferromagnets and antiferromagnets.
Thesis. 1977. Ph.D.--Massachusetts Institute of Technology. Dept. of Physics.
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Ultrafast laser driven spin generation in metallic ferromagnets
… studies of spin generation in metallic ferromagnets (FM) driven by ultrafast laser light using a pump-probe technique. The pump light gives a driving force for spin generation by depositing energy or spin angular momentum on FM. The probe light measures spin responses by magneto-optical …
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Current-induced torques in ferromagnets at room temperature
This thesis uses ferromagnetic resonance to explore the current-induced torques (CITs) in two different systems, namely YIG/heavy metal bilayers and bulk NiMnSb, at room temperature. We apply a microwave current to the sample while sweeping the external magnetic field, and measure the longitudinal …
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Phase structure and symmetry breaking in SU(N) ferromagnets
Μελετάμε τη φασική δομή σιδηρομαγνητών των οποίων οι δομικοί λίθοι φέρουν μια μη αναγώγιμη αναπαράσταση της ομάδας SU(N), και αλληλεπιδρούν ανά δύο μεταξύ τους μέσω αλληλεπιδράσεων μακράς εμβέλειας αναλλοίωτων κάτω από SU(N) μετασχηματισμούς. Αναπτύσσουμε τον φορμαλισμό για τη μελέτη της …
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Electrical control of spin dynamics in spin-orbit coupled ferromagnets
This thesis describes the control of magnetisation dynamics using electricity. Direct electrical control of magnetisation is desirable for the development of efficient scalable magnetic memories. In materials with broken inversion symmetry and spin-orbit coupling, electrical current can exert a …
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Taking Steps Towards Superfluid-like Spin Transport in Metallic Ferromagnets
Conventional electronics rely on the transport of electrons through a circuit to carry information. This comes with ever-present Joule heating as a result of the resistive scattering of electrons. Recent works in the field of spintronics have focused on using magnetic excitations (e.g., spin waves) …
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Angle-resolved photoemission spectroscopy studies of epitaxially-grown van der Waals ferromagnets
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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Thermal, Electrical, and Spin Transport: Encompassing Low-Damping Ferromagnets and Antiferromagnetic/Ferromagnetic Heterostructures
<p>Continuing technological advancements bring forth escalating challenges in global energy consumption and subsequent power dissipation, posing significant economic and environmental concerns. In response to these difficulties, the fields of thermoelectrics, spintronics, and spincaloritronics …
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Superconducting phase transitions in hybrid superconducting systems with ferromagnets and spin-orbit coupling
This PhD thesis investigates theoretically the proximity-coupling of superconductivity with ferromagnetism and/or spin-orbit coupling (SOC) in hybrid superconductor systems. The results are summarised in three results chapters which assess the proximity effect in hybrid superconductor systems …
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Phase Transitions in Disordered Systems: I. Exciton/electron-Hole Liquid/plasma System in Germanium and Ii. Amorphous Ferromagnets and Spin Glasses
In Part I of this thesis, we present experimental evidence demonstrating that a metal-insulator (M-I) phase transition can occur separately from the liquid-gas (L-G) transition in the exciton/electron-hole (e-h) gas/e-h liquid system in stressed Ge. Using a strain well to confine the photoexcited …
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Phase transitions in disordered systems: I. exciton/electron-hole liquid/plasma system in germanium and II. amorphous ferromagnets and spin glasses
In Part I of this thesis, we present experimental evidence demonstrating that a metal-insulator (M-I) phase transition can occur separately from the liquid-gas (L-G) transition in the exciton/electron-hole (e-h) gas/e-h liquid system in stressed Ge. Using a strain wel1 to confine the photoexcited …
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Spin-triplet proximity effects in magnetically controlled heterostructures with s-wave superconductors
… film superconductor is proximity-coupled to two ferromagnets. Evidence of triplet generation is provided through *T*<sub>C</sub> measurements as a function of the magnetisation angle between the two ferromagnets. A maximum suppression in *T*<sub>C</sub> was obtained when the two ferromagnets were …
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Solitons in Magnetic Systems
… classical magnetization dynamics of solid-state ferromagnets. Chapter 2 introduces the physical systems under consideration and the relevant theoretical tools. Chapter 3 reports results on oscillations of magnetic solitons under a uniform external force field in immiscible BEC mixtures/easy-axis …
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Magnetic domain walls driven by interfacial phenomena
… motion has been observed in atomically-thin ferromagnets sandwiched between a nonmagnetic heavy metal and an insulator. Through experimental studies on various sputtered magnetic multilayers, we elucidate the mechanism of such anomalous domain-wall dynamics. We show that conventional …
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Theoretical Investigations of the Structural, Dynamical, Electronic, Magnetic, and Thermoelectric Properties of CoRhYSi (Y = Cr, Mn) Quaternary Heusler Alloys
… of CoRhCrSi and CoRhMnSi, which are simple ferromagnets that are approximately half metallic in nature, electronic structure calculations demonstrate that these compounds have a gap in the minority states band and are obviously half-metallic ferromagnets. The magnetic moments of the CoRhCrSi …
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Phonon-mediated Casimir effect
… of the single-layer system. For easy plain ferromagnets, at saturation value of the external field perpendicular to the easy axis, the Green’s function demonstrates the branch cut behavior. It is contrasted to the systems of an itinerant quasiparticle in the antiferromagnetic background …
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Skyrmions and Biskyrmions in Magnetic Films
… matter systems, specifically in thin-film ferromagnets.</p>
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Ferromagnetic dynamics in coupled systems
… is investigated in order to understand both the ferromagnets themselves, and the systems they are coupled to. This work investigates recent claims that spin-triplet superconducting Cooper pairs can be generated at superconducting Nb-fullerene interfaces in thin-film heterostructures by looking …
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Landauer's theory of charge and spin transport in magnetic multilayers
… spin current in a realistic system consisting of ferromagnets with a finite exchange splitting and appropriate boundary conditions. We apply our formulated approach in Chapter 3 to a set of collinear spin problems whereby the two magnetic layers in our general multilayer junction (consisting of …
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