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    • Graduate School - MU Theses and Dissertations (MU)
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    • 2013 Dissertations (MU)
    • 2013 MU dissertations - Freely available online
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    Spin-wave spintronics

    Liu, Tianyu
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    [PDF] public.pdf (2.172Kb)
    [PDF] short.pdf (44.04Kb)
    Date
    2013
    Format
    Thesis
    Metadata
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    Abstract
    Spin waves in insulating magnets are ideal carriers for spin currents with low energy dissipation. An electric field can modify the dispersion of spin waves, by directly affecting, via spin-orbit coupling, the electrons that mediate the interaction between magnetic ions. Our microscopic calculations based on the superexchange model indicate that this effect of the electric field is sufficiently large to be used to effectively control spin-wave spin currents. We apply these findings to the design of spin-wave phase shifter, and a spin-wave interferometric device, which acts as a logic inverter and can be used as a building block for room-temperature, low-dissipation logic circuits. This part of work has been published in Phys. Rev. Lett. and J. Appl. Phys.. Besides the magneto-electric effect, we also study the magneto-thermal effect that couples the spin-wave spin current to the thermal current. In analogy to Coulomb drag effect, we propose a spin-wave drag effect due to magnetic dipolar interaction in a ferromagnetic bilayer system. Compared with Coulomb drag effect in electron gas bilayer, we find that here the interlayer transport coefficients abnormally increase as the temperature decreases because of bosonic statistics of magnons. Besides, the coefficients show an angular dependence on the angle between saturation magnetization and spin-wave spin current.
    URI
    https://hdl.handle.net/10355/44661
    https://doi.org/10.32469/10355/44661
    Degree
    Ph. D.
    Thesis Department
    Physics and astronomy (MU)
    Rights
    OpenAccess.
    This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License.
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    • 2013 MU dissertations - Freely available online
    • Physics and Astronomy electronic theses and dissertations (MU)

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