Title:
Spin Transport In Aluminum Grains and Single Debye Relaxation In BST nanoparticles

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dc.contributor.advisor Davidovic, Dragomir
dc.contributor.author Zhang, Liyuan en_US
dc.contributor.committeeMember Conrad, Edward H.
dc.contributor.committeeMember Phillip First
dc.contributor.committeeMember Alexei Marchenkov
dc.contributor.committeeMember Zhonglin Wang
dc.contributor.department Physics en_US
dc.date.accessioned 2007-08-16T17:42:06Z
dc.date.available 2007-08-16T17:42:06Z
dc.date.issued 2007-07-05 en_US
dc.description.abstract This thesis consists of two distinct components: (1) Spin-polarized electron transport through aluminum array nanoparticles, (2) A single electric relaxation process in Barium Strontium Titanate (BST) nanoparticles. In the first chapter, we summarize our main results and new finding, and we also present our motivation. For the first component (chapters 2-5), we studied electron spin transport in nanometer scale aluminum grains as embedded in a ferromagnet tunneling junction. We observed tunnelling-magnetoresistance (TMR) and spin valve effects. From the TMR strong asymmetry with bias voltage, we explored spin relaxation effects. Additionally we also obtained the spin-coherence time on the order of nanoseconds by using the Hanle effect. For the second component (chapters 6-9), we investigated the dielectric response of BST and Barium Titanate (BTA) (high dielectric constant ferroelectrics) nanoparticles. The results were found to be quite unusual when compared with the dielectric response of film or bulk. The dielectric response is Debye relaxation with only a single relaxation time, and the relaxation time exhibits the Arrhenius Law at temperatures below 200 Kelvin. en_US
dc.description.degree Ph.D. en_US
dc.identifier.uri http://hdl.handle.net/1853/16160
dc.publisher Georgia Institute of Technology en_US
dc.subject Nanoparticles en_US
dc.subject Relaxation en_US
dc.subject Low temperature en_US
dc.title Spin Transport In Aluminum Grains and Single Debye Relaxation In BST nanoparticles en_US
dc.type Text
dc.type.genre Dissertation
dspace.entity.type Publication
local.contributor.advisor Davidovic, Dragomir
local.contributor.corporatename College of Sciences
local.contributor.corporatename School of Physics
relation.isAdvisorOfPublication 5be191c2-885b-4b0d-9edd-c3fed2502344
relation.isOrgUnitOfPublication 85042be6-2d68-4e07-b384-e1f908fae48a
relation.isOrgUnitOfPublication 2ba39017-11f1-40f4-9bc5-66f17b8f1539
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