Micromagnetic Simulations of Domain-wall Dynamics in LSAT substrate LSMO nanowires

One of the largest challenges in creating spin-driven electronic devices is manipulating the spin texture of a sample using a current, rather than a magnetic field. La0.7Sr0.3MnO3 (LSMO) nanowires are of particular interest for creating such devices, because they allow for the creation of currents carrying a net spin due to the spin-polarised nature of LSMO. If two regions of opposite magnetisation, separated by a domain wall, are created in such a nanowire, it should be possible to move said domain wall using a spin-polarised current. In this thesis, a candidate geometry for a LSMO nanowire that allows for the creation of a domain wall and subsequent manipulation by current of that domain wall is determined using micromagnetic simulations. Different geometries and strain axes were investigated using field sweeps. Both a transverse and a vortex domain wall were identified from these field sweeps and were then tested by applying current. It was determined that a continuous current...Show moreOne of the largest challenges in creating spin-driven electronic devices is manipulating the spin texture of a sample using a current, rather than a magnetic field. La0.7Sr0.3MnO3 (LSMO) nanowires are of particular interest for creating such devices, because they allow for the creation of currents carrying a net spin due to the spin-polarised nature of LSMO. If two regions of opposite magnetisation, separated by a domain wall, are created in such a nanowire, it should be possible to move said domain wall using a spin-polarised current. In this thesis, a candidate geometry for a LSMO nanowire that allows for the creation of a domain wall and subsequent manipulation by current of that domain wall is determined using micromagnetic simulations. Different geometries and strain axes were investigated using field sweeps. Both a transverse and a vortex domain wall were identified from these field sweeps and were then tested by applying current. It was determined that a continuous current density applied along the easy axis of the nanowire with a 20 nm thickness to a vortex domain wall, with a 7 mT external field along the same axis resulted in the domain wall being pushed past the notch. If reproduced experimentally, this would bring us one step closer to creating magnetic spin-based logic and storage devices.Show less

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Micromagnetic Simulations of Domain-wall Dynamics in LSAT substrate LSMO nanowires