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Interfacial Spin Wave Phenomena in thin Film Oxide Heterostructures.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Interfacial Spin Wave Phenomena in thin Film Oxide Heterostructures./
作者:	Riddiford, Lauren Jane.
面頁冊數:	1 online resource (160 pages)
附註:	Source: Dissertations Abstracts International, Volume: 84-05, Section: B.
Contained By:	Dissertations Abstracts International84-05B.
標題:	Physics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29756355click for full text (PQDT)
ISBN:	9798357509796

Interfacial Spin Wave Phenomena in thin Film Oxide Heterostructures.
Riddiford, Lauren Jane.

Interfacial Spin Wave Phenomena in thin Film Oxide Heterostructures. - 1 online resource (160 pages)

Source: Dissertations Abstracts International, Volume: 84-05, Section: B.

Thesis (Ph.D.)--Stanford University, 2022.

Includes bibliographical references

Spintronics, based on the use of the spin degree of freedom of electrons, has attracted much attention as an avenue for creating energy-ecient memory storage and electronic devices. The discovery of spin-based phenomena in magnetic heterostructures, like giant magnetoresistance and spin-transfer torques, have been used to make magnetic devices like MRAM and magnetic field sensors. For novel magnetic devices, greater energy eciency with minimal heat generation is desirable. A pure spin current, where spin angular momentum is transferred without any charge current, could be utilized to realize energy-ecient devices due to the lack of heat dissipation associated with moving charge. Low-damping magnetic insulator thin films which can propagate spin currents with minimal dissipation are essential for this purpose. At the same time, magnetic insulators are also useful to stabilize novel ground states in neighboring materials.We have identified a class of spinel ferrite magnetic insulators which have ideal properties for these applications. In particular, low-damping MgAl0.5Fe1.5O4 (MAFO) thin films show ecient spin current generation and transmission in bilayers with Pt and W. I will show that we can detect ecient spin-to-charge conversion and measure a highly transparent interface to spin. I also find that, surprisingly, spin relaxation in Pt can be described by the Dyakonov-Perel mechanism with an extrinsic spin Hall e↵ect. Further, I will show results on the microwave charge-to-spin properties of a newly synthesized spinel ferrite with perpendicular magnetic anisotropy, Li0.5Al1Fe1.5O4 (LAFO), in bilayers with Pt. I discover the resonant properties of LAFO di↵er significantly from nonresonant magnetic excitation through spin-orbit torques, with crystallographic asymmetries in charge-to-spin conversion.Interfacing magnetic insulators with strongly spin-orbit coupled topological insulators is of interest for both spintronics applications and inducing novel properties through interfacial coupling. I will discuss applying MAFO to the study of magnetic proximity e↵ects (MPEs) in topological insulators by synthesizing MAFO/Bi2Se3 bilayers. Magnetic insulator-topological insulator heterostructures have been widely studied in search of a MPE in the topological insulator leading to chiral edge states. I find the current framework for successfully identifying a MPE is incomplete; magnetic profiling or Hall e↵ect data must be combined with structural data to identify a proximity e↵ect.Finally, the utility of using a 2d electron gas (2DEG) for spintronics will be evaluated in the context of charge-to-spin conversion. The 2DEG formed at the LaTiO3/SrTiO3 (LTO/STO) interface is uniquely well-suited for this purpose, because the LaTiO3 above the 2DEG is also conductive as a result of strain. By interfacing the LTO/STO heterostructure with a magnetic metal, CoFeB, I find that LTO/STO has a large damping-like torque eciency which decreases as temperature decreases. Further, I find a significant and asymmetric thermoelectric contribution from LTO/STO which can be detected via the planar Nernst e↵ect in CoFeB. This bilayer structure provides information about both the Rashba spin-orbit coupling of the 2DEG as well as the thermoelectric properties.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798357509796Subjects--Topical Terms:

516296
Physics.
Index Terms--Genre/Form:

542853
Electronic books.

Interfacial Spin Wave Phenomena in thin Film Oxide Heterostructures.
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500 $a Source: Dissertations Abstracts International, Volume: 84-05, Section: B.
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502 $a Thesis (Ph.D.)--Stanford University, 2022.
504 $a Includes bibliographical references
520 $a Spintronics, based on the use of the spin degree of freedom of electrons, has attracted much attention as an avenue for creating energy-ecient memory storage and electronic devices. The discovery of spin-based phenomena in magnetic heterostructures, like giant magnetoresistance and spin-transfer torques, have been used to make magnetic devices like MRAM and magnetic field sensors. For novel magnetic devices, greater energy eciency with minimal heat generation is desirable. A pure spin current, where spin angular momentum is transferred without any charge current, could be utilized to realize energy-ecient devices due to the lack of heat dissipation associated with moving charge. Low-damping magnetic insulator thin films which can propagate spin currents with minimal dissipation are essential for this purpose. At the same time, magnetic insulators are also useful to stabilize novel ground states in neighboring materials.We have identified a class of spinel ferrite magnetic insulators which have ideal properties for these applications. In particular, low-damping MgAl0.5Fe1.5O4 (MAFO) thin films show ecient spin current generation and transmission in bilayers with Pt and W. I will show that we can detect ecient spin-to-charge conversion and measure a highly transparent interface to spin. I also find that, surprisingly, spin relaxation in Pt can be described by the Dyakonov-Perel mechanism with an extrinsic spin Hall e↵ect. Further, I will show results on the microwave charge-to-spin properties of a newly synthesized spinel ferrite with perpendicular magnetic anisotropy, Li0.5Al1Fe1.5O4 (LAFO), in bilayers with Pt. I discover the resonant properties of LAFO di↵er significantly from nonresonant magnetic excitation through spin-orbit torques, with crystallographic asymmetries in charge-to-spin conversion.Interfacing magnetic insulators with strongly spin-orbit coupled topological insulators is of interest for both spintronics applications and inducing novel properties through interfacial coupling. I will discuss applying MAFO to the study of magnetic proximity e↵ects (MPEs) in topological insulators by synthesizing MAFO/Bi2Se3 bilayers. Magnetic insulator-topological insulator heterostructures have been widely studied in search of a MPE in the topological insulator leading to chiral edge states. I find the current framework for successfully identifying a MPE is incomplete; magnetic profiling or Hall e↵ect data must be combined with structural data to identify a proximity e↵ect.Finally, the utility of using a 2d electron gas (2DEG) for spintronics will be evaluated in the context of charge-to-spin conversion. The 2DEG formed at the LaTiO3/SrTiO3 (LTO/STO) interface is uniquely well-suited for this purpose, because the LaTiO3 above the 2DEG is also conductive as a result of strain. By interfacing the LTO/STO heterostructure with a magnetic metal, CoFeB, I find that LTO/STO has a large damping-like torque eciency which decreases as temperature decreases. Further, I find a significant and asymmetric thermoelectric contribution from LTO/STO which can be detected via the planar Nernst e↵ect in CoFeB. This bilayer structure provides information about both the Rashba spin-orbit coupling of the 2DEG as well as the thermoelectric properties.
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650 4 $a Thin films. $3 626403
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650 4 $a Optimization. $3 891104
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650 4 $a Mathematics. $3 515831
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773 0 $t Dissertations Abstracts International $g 84-05B.
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