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Spin dependent transport and spin tr...

Ozatay, Ozhan.

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Spin dependent transport and spin transfer in nanoconstrictions and current confined nanomagnets.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Spin dependent transport and spin transfer in nanoconstrictions and current confined nanomagnets./
作者:	Ozatay, Ozhan.
面頁冊數:	278 p.
附註:	Adviser: Robert A. Buhrman.
Contained By:	Dissertation Abstracts International68-03B.
標題:	Physics, Condensed Matter. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3255484

Spin dependent transport and spin transfer in nanoconstrictions and current confined nanomagnets.
Ozatay, Ozhan.

Spin dependent transport and spin transfer in nanoconstrictions and current confined nanomagnets. - 278 p.

Adviser: Robert A. Buhrman.

Thesis (Ph.D.)--Cornell University, 2007.

In this thesis, I have employed point contact spectroscopy to determine the nature of electron transport across constrained domain walls in a ferromagnetic nanocontact and to uncover the relationship between ballisticity of electron transport and domain wall magnetoresistance. In the range of hole sizes studied (from 10 to 3 nm) the resulting magnetoresistance was found to be less than 0.5% and one that increases with decreasing contact size.Subjects--Topical Terms:

1018743
Physics, Condensed Matter.

Spin dependent transport and spin transfer in nanoconstrictions and current confined nanomagnets.
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100 1 $a Ozatay, Ozhan. $3 1296739
245 1 0 $a Spin dependent transport and spin transfer in nanoconstrictions and current confined nanomagnets.
300 $a 278 p.
500 $a Adviser: Robert A. Buhrman.
500 $a Source: Dissertation Abstracts International, Volume: 68-03, Section: B, page: 1689.
502 $a Thesis (Ph.D.)--Cornell University, 2007.
520 $a In this thesis, I have employed point contact spectroscopy to determine the nature of electron transport across constrained domain walls in a ferromagnetic nanocontact and to uncover the relationship between ballisticity of electron transport and domain wall magnetoresistance. In the range of hole sizes studied (from 10 to 3 nm) the resulting magnetoresistance was found to be less than 0.5% and one that increases with decreasing contact size.
520 $a I have used point contacts as local probes, to study the spin dependent transport across Ferromagnet/Normal Metal/Ferromagnet(FM/NM/FM) trilayers as well as the consequences of localized spin polarized current injection into a nano magnet on spin angular momentum transfer and high frequency magnetization dynamics. I have demonstrated that absolute values for spin transfer switching critical currents are reduced in this new geometry as compared to uniform current injection. I have also performed micromagnetic simulations to determine the evolution of magnetization under the application of magnetic fields and currents to gain more insights into experimental results.
520 $a I have used Scanning Transmission Electron Microscopy (STEM), X-Ray Photoemission Spectroscopy (XPS) and Electron Energy Loss Spectroscopy (EELS) techniques to characterize the interfacial mixing and oxygen diffusion in the metallic multilayers of interest. I have shown that the Ta/CuOx bilayer structure provides a smooth substrate by improving interfacial roughness due to grain boundary diffusion of oxygen and reaction with Ta that fills in the grain boundary gaps in Cu. Analysis of the Py/AlOx interface proved a strong oxidation passivation on the Py surface by Al coating accompanied by Fe segregation into the alumina. I have utilized the characterization results to design a new nanomagnet whose sidewalls are protected from adventitious sidewall oxide layers and yields improved device performance.
520 $a The oxide layers that naturally develop at the sidewalls of Py nanomagnets cause an enhancement in magnetic damping especially for temperatures below the blocking temperature of the AFM layer (≤40K). Studies with pillars protected by Al coating and ones with more NiO coating (&sim;2.5 nm) shed light onto the role of surface oxides in determining temperature dependent behaviour of both spin torque and field driven switching characteristics.
590 $a School code: 0058.
650 4 $a Physics, Condensed Matter. $3 1018743
650 4 $a Physics, Electricity and Magnetism. $3 1019535
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710 2 0 $a Cornell University. $3 530586
773 0 $t Dissertation Abstracts International $g 68-03B.
790 $a 0058
790 1 0 $a Buhrman, Robert A., $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3255484