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Spin orientations and spin-orbit torque in magnetic nanostructures

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dc.contributor Ph.D. Program in Physics.
dc.contributor.advisor Özatay, Özhan,
dc.contributor.author Karakaş, Vedat.
dc.date.accessioned 2023-03-16T10:46:22Z
dc.date.available 2023-03-16T10:46:22Z
dc.date.issued 2019.
dc.identifier.other PHYS 2019 K37 PhD
dc.identifier.uri http://digitalarchive.boun.edu.tr/handle/123456789/13786
dc.description.abstract In this thesis three different spintronic devices and their static behaviours are studied under external magnetic field or applied current. We started to work on the static properties of magnetic antivortices, formed in a special geometry called astroid, and achieved stable antivortex nucleation, annihilation and manipulation. We also observed the response of antivortex to the external magnetic field. Another study was the observation of magnetic radial vortices in the presence of interfacial Dzyaloshinskii-Moriya interaction (i-DMI) in Pt/CoFeB/Ti nanopillar multilayers. By tuning the magnetic anisotropy via interface engineering and postpro duction treatments, we achieved to stabilize a variety of magnetic configurations such as Ńeel skyrmions, horseshoes and radial vortices at room temperature and under zero bias field. Lastly, we have focused on the observation of self-torque of (100) oriented IrMn3 antiferromagnet. We observed the exchange field shift with respect to applied current. Additionally, we studied the effect of spin orbit torque by measuring DC current de pendence of Hall bar resistance. The efficiency of different types of heavy metals, which have different spin Hall angles, was studied to compare their resistance variation of the device.
dc.format.extent 30 cm.
dc.publisher Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2019.
dc.subject.lcsh Nanostructures.
dc.title Spin orientations and spin-orbit torque in magnetic nanostructures
dc.format.pages xxix, 155 leaves ;


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