Magnetic Characterization of Fe/PLA 3-D Printed Filaments and Fe-Doped Ga2O3 Thin Films
Date
2022-08
Authors
Henderson, Lauren
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Abstract
<p>The work of this thesis consisted of magnetic characterization on two different materials:
soft magnetic Fe/PLA filaments 3-D printed using magnetic field assisted additive
manufacturing (MFAAM) and Fe-doped Ga2O3 thin films grown via pulsed laser
deposition (PLD) of various iron concentrations. The Fe/PLA filaments were printed on
top of permanent magnets to supply different external magnetic field strengths to the
filaments during the printing process, a modification referred to as magnetic field assisted
additive manufacturing (MFAAM). These various filaments were then measured using a
MicroSense biaxial VSM to observe magnetic field dependence as well as field angle
dependence on the magnetic properties and determine any potential anisotropy. The
filaments were also characterized by digital microscopy and x-ray diffraction (XRD) to
further confirm the results from the VSM. These results confirmed enhanced magnetic
properties through increased susceptibility and induced anisotropy of the filaments
printed with MFAAM.</p>
<p>The magnetic properties of Fe-doped Ga2O3 thin films of various iron concentrations
(2%, 5%, 15%, 40%, and 75%) and crystal structures (monoclinic for concentrations less
than 10% and spinel cubic for samples greater than 10%) were examined. These films
were measured using both the MicroSense VSM and the QuantumDesign PPMS VSM to
observe their magnetic moments’ dependency on magnetic field strength, temperature,
and iron concentration. The samples’ hysteresis curves were inspected and magnetic properties such as saturation magnetization, coercivity, and remanence were estimated
and compared. The magnetization with respect to temperature was also investigated for
the 5% and 75% Fe-doped samples. The magnetization vs. temperature curves displayed
different magnetic behavior for the 5% and 75% samples, suggesting a potential change
in magnetic ordering as the iron concentration increased.</p>
Description
Keywords
Thin films, Additive manufacturing, Semiconductor, Magnetic characterization
Citation
Henderson, L. (2022). <i>Magnetic characterization of Fe/PLA 3-D printed filaments and Fe-doped Ga2O3 thin films</i> (Unpublished thesis). Texas State University, San Marcos, Texas.