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    Magnesium Oxide Tunneling Current and Ferromagnetic Film Characterization

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    Author
    Bull, Horace
    Keyword
    Magnetic Tunnel Junctions
    Vibrating Sample Magnetometer Study
    Current in Plane Tunneling Study
    Spin transport electronics
    Transmission Electron Microscopy
    Date Published
    2016-05-01
    
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    URI
    http://hdl.handle.net/20.500.12648/1128
    Abstract
    Magnetic Tunnel Junctions are a very promising technology with the potential to replace numerous forms of computer memory a well as a wide range of other applications. Three novel studies are done demonstrating various aspects of MTJ design and manufacturing showing their importance in understanding device performance. First, a Vibrating Sample Magnetometer (VSM) study comparing Co40Fe40B20 and Co20Fe60B20 films of varying thicknesses between 0.6 nm and 3.2 nm is reported. Greater iron content is shown to increase the overall magnetic moment of the samples. Second, a Current in Plane Tunneling (CIPT) study is done showing the dependence Magnetoresistance (MR) has on the thickness of the MTJ free layer and the crystallinity of the active region of devices. A full MTJ device stack is developed, with free layer thicknesses from 0.6-1.75 nm and 1.5-3.3 nm creating a wedge profile on each sample wafer. CIPT shows a significant increase to MR with anneal, verifying the presence of the [001] crystal structure in post anneal samples using TEM. Third, Ta/Co40Fe40B20/MgO/Co40Fe40B20/Ta thin film metal-insulator-metal capacitors were developed to measure the tunneling effect and how it changes as a result of MgO thickness and CoFeB crystallinity. Devices were designed with: varied MgO thickness from 0.5 nm to 2 nm thick, with pre and post anneal CoFeB. Current-Voltage data was collected and device resistance was found to have a linear dependence on MgO thickness in the post anneal CoFeB/MgO/CoFeB samples. The uniformity of the IV data indicates potential for use monitoring devices during MTJ manufacturing.
    Description
    A Master's Thesis Presented to SUNY Polytechnic Institute In Partial Fulfillment of the Requirement for the Master of Engineering Degree.
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    SUNY Polytechnic Institute Colleges of Nanoscale Science and Engineering Master's Theses

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