Document Type
Dissertation
Degree
Doctor of Philosophy (PhD)
Major/Program
Electrical Engineering
First Advisor's Name
Sakhrat Khizroev
First Advisor's Committee Title
Committee Chair
Second Advisor's Name
George Dulikravich
Second Advisor's Committee Title
committee member
Third Advisor's Name
Ping Liang
Third Advisor's Committee Title
committee member
Fourth Advisor's Name
Ismail Guvenc
Fourth Advisor's Committee Title
committee member
Fifth Advisor's Name
Stavros Georgakopoulos
Fifth Advisor's Committee Title
committee member
Date of Defense
7-8-2016
Abstract
This research used a focused ion beam in order to fabricate record small nano-magnetic structures, investigate the properties of magnetic materials in the rarely studied range of nanometer size, and exploit their extraordinary characteristics in medicine and nano-electronics. This study consists of two parts: (i) Fabrication and study of record small magnetic tunnel junctions (ii) Introduction of a novel method for detection of magnetoelectric nanoparticles (MENs) in the tissue.
A key challenge in further scaling of CMOS devices is being able to perform non-volatile logic with near zero power consumption. Sub-10-nm nanomagnetic spin transfer torque (STT) magnetic tunneling junctions (MTJs) have the potential for a universal memory that can address this key challenge. The main problem is to decrease the switching current density. This research studied these structures in sub-10-nm size range. In this range, spin related excitations consume considerably smaller amounts of energy as compared to the larger scale. This research concluded that as predicted a decrease in switching current superior to that of the linear scaling will happen in this size range.
Magneto-electric nanoparticles (MENs) can be used to directly couple intrinsic electric-field-driven processes with external magnetic fields for controlling neural activity deep in the brain. These particles have been proven to be capable of inducing deep brain stimulation non-invasively. Furthermore, these magneto-electric nano-particles can be used for targeted drug delivery and are contenders to replace conventional chemotherapy. The circulatory system can deliver a drug to almost every cell in the body; however, delivering the drug specifically into the tumor cell and then releasing it on demand remains a formidable task. Nanomedicine can accomplish this, but ensuring that the drug is released at an appropriate rate once at the target site is an important task. In order to have a complete understanding of the behavior of these MENs when injected into the body, a comprehensive bio-distribution study was performed. This study introduced a novel spectroscopy method for tracing the nanoparticles in the bloodstream. This study investigated the post injection distribution of the MENs in vital organs throughout a period of two months.
Identifier
FIDC000785
Recommended Citation
Hadjikhani, Ali, "Nanofabrication and Spectroscopy of Magnetic Nanostructures Using a Focused Ion Beam" (2016). FIU Electronic Theses and Dissertations. 2536.
https://digitalcommons.fiu.edu/etd/2536
Included in
Biological Factors Commons, Biology and Biomimetic Materials Commons, Biomedical Devices and Instrumentation Commons, Chemical and Pharmacologic Phenomena Commons, Circulatory and Respiratory Physiology Commons, Electrical and Electronics Commons, Electromagnetics and Photonics Commons, Electronic Devices and Semiconductor Manufacturing Commons, Medical Immunology Commons, Nanotechnology Fabrication Commons, Semiconductor and Optical Materials Commons
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