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Investigation of Spin-Transfer Torque on Iron Garnets

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dc.contributor.authorJermain, Colin Lowery
dc.contributor.chairRalph, Daniel C
dc.contributor.committeeMemberBuhrman, Robert A
dc.contributor.committeeMemberMueller, Erich
dc.date.accessioned2017-04-04T20:28:38Z
dc.date.available2019-02-01T07:02:45Z
dc.date.issued2017-01-30
dc.description.abstractSpin-transfer torque provides an important mechanism for controlling thin films of magnetic material with thicknesses on the nanometer scale, and can significantly effect the orientation of a magnet to cause reversal and switching. I examine the iron garnets, yttrium iron garnet (Y3Fe5O12, YIG) and lutetium iron garnet (Lu3Fe5O12, LuIG), to investigate the interaction of spin-torque on electrically-insulating magnets. This insulating property prevents electrical current from shunting through the iron garnet magnet, which improves the amount of current available to generate spin-torque with the spin-Hall effect in an adjacent heavy metal. I demonstrate that nanometer-scale devices can be fabricated out of ultra-thin YIG and LuIG, and explore their switching behavior. I construct a ferromagnetic resonance measurement system to characterize the YIG and LuIG material and understand their properties. Using this system, I explore the magnetic damping in ultra-thin LuIG, and YIG at low-temperatures to explain the relaxation phenomena that occur in these systems. Overall, this research provides a significant step forward in understanding the properties of thin-films of iron garnet, and the feasibility of using spin-transfer torque on electrically-insulating materials.
dc.identifier.doihttps://doi.org/10.7298/X4XS5SDC
dc.identifier.otherJermain_cornellgrad_0058F_10150
dc.identifier.otherhttp://dissertations.umi.com/cornellgrad:10150
dc.identifier.otherbibid: 9906147
dc.identifier.urihttps://hdl.handle.net/1813/47900
dc.language.isoen_US
dc.subjectNanoscience
dc.subjectCondensed matter physics
dc.subjectiron garnet
dc.subjectspin-Hall effect
dc.subjectspin-transfer torque
dc.titleInvestigation of Spin-Transfer Torque on Iron Garnets
dc.typedissertation or thesis
dcterms.licensehttps://hdl.handle.net/1813/59810
thesis.degree.disciplinePhysics
thesis.degree.grantorCornell University
thesis.degree.levelDoctor of Philosophy
thesis.degree.namePh. D., Physics

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