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Showing 1 to 20 of 20 for “"Dzyaloshinskii-Moriya interaction"”.
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Aspects of Dzyaloshinskii-Moriya Interaction in Two Dimensional Magnetic Structures
… has been attributed to the presence of a strong Dzyaloshinskii-Moriya interaction (DMI). In this thesis, the DMI mediated by the conduction electrons in two dimensional magnetic systems such as magnetic thin lms or at the interfaces between two magnetic materials has been studied. I calculate the …
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Dzyaloshinskii-Moriya Interaction and Local Exchange Variation in Rare-Earth Transition-Metal Ferrimagnets
… governed by an antisymmetric magnetic exchange interaction known as the Dzyaloshinskii-Moriya Interaction (DMI). Unlike the symmetric Heisenberg interaction that favors collinear spin alignment and gives rise to ferromagnetism and antiferromagnetism, the DMI favors canting of spins perpendicular …
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Magnetic thin films For spintronic memory
… which have high spin-orbit coupling and Dzyaloshinskii-Moriya interaction. An optimization of the different physical interactions involved in magnetic thin films can result in stripe and labyrinth domain patterns which can then be transformed into skyrmion lattices. In this thesis, we …
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Manipulation of spin textures by unconventional spin torques
… insights into spin-charge and spin-orbital interactions in magnetic materials. In this thesis, we examine novel mechanisms for the evolution and control of nonuniform magnetization textures. We first show that magnonic spin currents due to spin wave propagation can couple to and drive …
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One-dimensional bosonization approach to higher dimensions
… is the ability to treat electron-electron interaction exactly in the low-energy limit. The approach predicts the failure of Fermi liquid and an absence of long-range order in one-dimensions. The low-energy description of one-dimensional interacting systems is called the Tomonaga-Luttinger …
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Exploring Quantum Phenomena in 2D Materials: From Valley Topology and Exciton Selection Rules to Tuning Magnetic Correlations
… exchange, single-ion anisotropy and the Dzyaloshinskii–Moriya interaction using the four-state energy mapping formalism. Although the elements have relatively small atomic numbers, the Dzyaloshinskii–Moriya interaction is comparable in magnitude to the anisotropic exchange. Additionally, …
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Interface-driven spin-orbit torques in magnetic heterostructures
… effects such as interfacial anisotropy and the Dzyaloshinskii-Moriya Interaction (DMI), which stabilizes chiral spin textures. This thesis is motivated to systematically vary the layer structure of magnetic heterostructures to understand and quantify spin-orbit torques. I showed that switching …
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Skyrmions and non-collinear magnetic domains in Fe₃GeTe₂
… of WTe2 on top of the Fe3GeTe2 can increase the Dzyaloshinskii{Moriya Interaction energy, which is the cause of non-collinear magnetic domains. Results from the magnetic characterization inform us on the conditions under which skyrmions and a variety of magnetic domains form in the Fe3GeTe2. In …
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The ground state of the spin-1/2 kagomé lattice antiferromagnet : neutron scattering studies of the zinc-paratacamite mineral family
… an ordered kagomé lattice antiferromagnet with a Dzyaloshinskii-Moriya interaction. Herbertsmithite is the first structurally perfect spin- 1 2 kagomé lattice antiferromagnet. Susceptibility, specific heat, and neutron scattering measurements show no sign of any spin freezing or transition to a …
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Magnetic domain walls driven by interfacial phenomena
… axis with a fixed chirality. We reveal that the Dzyaloshinskii-Moriya interaction, arising from spin-orbit coupling and asymmetric interfaces, stabilizes homochiral domain walls in ultrathin ferromagnets. Our findings not only provide a route to bolster current-driven domain-wall dynamics, but …
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Optimization of magnetic thin films for generating stable chiral magnetic structures
… which have high spin-orbit coupling and Dzyaloshinskii-Moriya interaction (DMI). Parameters such as layer thicknesses and composition can be tuned for optimal skyrmion stability, speed, and size. We use micromagnetic simulations to confirm experimental studies where skyrmions have been …
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Iron Garnet Thin Films for Integrated Photonics and Spintronics
… m/s, but require an in-plane field. We show that Dzyaloshinskii–Moriya interaction (DMI) can be introduced in heterostructures of BiYIG and TmIG and report the first proof-of-concept of field-free current induced DW motion in Pt/BiYIG/TmIG stacks, as well as formation of room temperature skyrmions.
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Pulsed Laser Deposited Iron Garnet Thin Films for Spintronics
… substrates that combine the non-zero interfacial Dzyaloshinskii–Moriya interaction (DMI) of TmIG with moderate damping between that of BiYIG and TmIG, making them useful for the development of high speed spin orbit torque driven magnetic devices. Lastly, we describe superlattices made from rare …
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Microstructural Analysis of Garnet-Heavy Metal Heterostructures
… information. REIGs exhibit a variety of magnetic interactions, both bulk and interfacial, which are valuable for spintronics. Interfacial phenomena such as spin transfer torque, spin orbit torque, and interfacial Dzyaloshinskii-Moriya interaction have all been clearly observed in REIG-heavy metal …
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Multipoles, Magnetic charges and chiral properties in antiferromagnetic materials inferred from resonant X-Ray diffraction
… relates its crystal field, the super-exchange interactions and electron¿phonon coupling. Previous works from different groups have not been able to explain the resonant x-ray diffraction data collected at the neptunium M4-edge. But new information, related to a change in the symmetry of the …
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Magnetic Skyrmions in Multilayers with Interfacial Dzyaloshinskii-Moriya Interactions
… skyrmions in multilayers with interfacial Dzyaloshinskii-Moriya interaction (DMI) were investigated in three aspects: stabilization, current-driven motion and antiferromagnetically coupled skyrmion pairs. The formation and stabilization of magnetic skyrmions without external magnetic fields …
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First Principles Studies of Magnetic Oxides, Spin-Driven Ferroelectricity, and the Effect of Polarization in the Chemistry of Functional Heterointerfaces
… spin-current model with Heisenberg-exchange and Dzyaloshinskii-Moriya interaction energetics we explain the microscopic origin of the polarization, including its direction, coupling to the spin helicity, charge density redistribution, and magnetic exchange interactions. Our experimental …
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Structure and dynamics of magnetic domain walls in multi-sublattice magnetic oxides
… its Néel character, generally stabilized by the Dzyaloshinskii–Moriya interaction (DMI). Fast DW motion of the order of km/s was shown in multi-sublattice metallic systems, overcoming the fundamental limits in ferromagnetic systems through angular momentum compensation of the sublattices. …
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Magnetic and Spintronic Properties of Rare-Earth Iron Garnets
… velocities over 2km/s and the presence of the Dzyaloshinskii-Moriya interaction, which stabilizes chiral Néel domain walls. In order to optimize REIG for these applications, it is useful to develop methods for tuning their magnetic and spintronic properties. In this work, we accomplish this …
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Electric field effect on magnetic interface phenomena
L'abstract è presente nell'allegato / the abstract is in the attachment