• Investigation of Surface Peening Technologies for Addressing Stress Corrosion Cracking in Used Fuel Dry-Cask Storage Stainless Steel Canisters 

  Lacy, John (2023-08-23)

  Nuclear power serves as a vital and sustainable global energy source. The safe, secure, and enduring storage of spent nuclear fuel is an important focus of the nuclear industry. In the United States, as in many nations ...

• Synthetic and dynamic control in strongly correlated transition metal oxides 

  Marks, Samuel David (2022-07-31)

  Binary and mixed oxides incorporating transition metal cations host a broad range of scientifically compelling and technologically significant optical, electronic, and magnetic properties. Transition metal oxides (TMOs) ...

• Photoinduced Structural Phenomena in Ferroelectric Oxide Electronic Materials Investigated by Synchrotron X-ray Diffraction 

  Ahn, Youngjun (2020-07-01)

  My thesis research investigates photoinduced phenomena in ferroelectric electronic oxide materials, with a focus on changes that occur on sub-nanosecond timescales and length scales ranging from single unit cells to the ...

• Epitaxial and Lateral Solid-Phase Crystallization of Complex Oxides 

  Chen, Yajin (2019)

  The crystallization of complex-oxide materials through a transformation from the amorphous to crystalline forms presents a range of new opportunities to synthesize new materials, and simultaneously poses important scientific ...

• Atomic Scale Medium Range Order and Relaxation Dynamics in Metallic Glass 

  Zhang, Pei (University of Wisconsin-Madison, 2017)

  We studied the atomic scale structure of bulk metallic glass (BMG) with the combination of fluctuation electron microscopy (FEM) and hybrid reverse Monte Carlo (HRMC) simulation. Medium range order (MRO), which occupies ...

• Structure Study of Magnetic Thin Films for Voltage Controlled Spintronics by Scanning Transmission Electron Microscopy Experiment and Density Functional Theory Calculations 

  Sun, Congli (University of Wisconsin-Madison, 2017-11-15)

  We have studied magnetic thin films for voltage controlled magnetic tunnel junctions (MTJs) by advanced scanning transmission electron microscopy (STEM) and density functional theory (DFT) simulations. MTJs are the ...

• Local Structure Analysis of Model Metal-Metal and Metal-Metalloid Metallic Glasses 

  Maldonis, Jason (University of Wisconsin-Madison, 2019-02-28)

  Materials scientists lack a general, abstract description of the atomic structure of metallic glasses (MGs). Structural descriptions developed for crystals and crystal defects are ineffective because the amorphous structure ...

• Advanced Electron Microscopy of Novel Ferromagnetic Materials and Ferromagnet / Oxide Interfaces in Magnetic Tunnel Junctions 

  Shi, Fengyuan (University of Wisconsin-Madison, 2013-10)

  We have studied novel ferromagnetic (FM) materials and FM electrode/tunnel barrier interfaces in magnetic tunnel junctions (MTJs) by advanced electron microscopy including scanning transmission electron microscopy (HRSTEM) ...

• Nanoscale Structural Characterization of Oxide and Semiconductor Heterostructures 

  Park, Joonkyu (2018-10-11)

  According to a recent report from International Technology Roadmap for Semiconductors (ITRS), semiconductor industry based on silicon Complementary metal–oxide–semiconductor (CMOS) technology is facing challenges in terms ...

• Nanoscale Strontium Titanate Sheets and Crystals 

  Tilka, Jack (2018-01-23)

  The physical properties of materials are dominated by their structure and composition. Insight into the structure of complex oxide materials has the potential to improve our understanding and eventually control of their ...

• Size Effects in Nanoscale Structural Phenomena 

  McElhinny, Kyle (2017-07-17)

  The creation of nanostructures offers the opportunity to modify and tune properties in ways inaccessible in bulk materials. A key component in this development is the introduction of size effects which reduce the physical ...

• Nanosecond Structural Dynamics of Ferroelectric Oxide Thin Films 

  Chen, Pice (2013)

  The functionalities of ferroelectric materials are closely related to the switchable spontaneous polarization and the polarization-structure coupling. A persistent effort has been made since the discovery of ferroelectricity ...

• Electric Field Response of Strained BiFeO3 and BaTiO3/CaTiO3 Superlattices 

  Cosgriff, Margaret P. (2015)

  Complex oxide materials can be driven into transient structural configurations using applied electric fields. Structural changes significantly impact the functional properties of these materials, including their piezoelectricity. ...

• Quantitative Scanning Transmission Electron Microscopy of Electronic and Nanostructured Materials 

  Yankovich, Andrew (2015-05-07)

  This thesis reports studies of electronic and nanostructured materials by advanced electron microscopy (EM) techniques, including scanning transmission electron microscopy (STEM), position averaged convergent beam electron ...

• Expitaxial growth and magnetic propreties of Fe3O4 flims on TiN buffered Si(001), Si(110), and Si(111) substrates 

  Xiang, H.; Shi, F.; Rzchowski, M. S.; Voyles, P. M.; Chang, Y. A. (2010)

  Epitaxial Fe3O4 thin films were grown on TiN buffered Si (001) , Si( 110) , and Si( 111) substrates by dc reactive sputtering deposition. Both Fe3O4 films and TiN buffer are fully epitaxial when grown at substrate ...

• Structure and physical properties of paracrystalline atomistic models of amorphous silicon 

  Voyles, P. M.; Zotov, N.; Nakhmanson, S. M.; Drabold, D. A.; Gibson, J. M.; Treacy, M. M. J.; Keblinski, P. (2001)

  We have examined the structure and physical properties of paracrystalline molecular dynamics models of amorphous silicon. Simulations from these models show qualitative agreement with the results of recent mesoscale ...

• Aluminum nanoscale order in amorphous Al92Sm8 measured by fluctuation electron microscopy 

  Stratton, W. G.; Hamann, J.; Perepezko, J. H.; Voyles, P. M.; Mao, X.; Khare, S. V. (2005)

  Fluctuation electron microscopy sFEMd measurements and simulations have identified nanoscale aluminum-like medium-range order in rapidly quenched amorphous Al92Sm8 which devitrifies by primary Al crystallization. Al92Sm8 ...

• Structural, optical, and magnetic characterization of monodisperse Fe-doped ZnO nanocrystals 

  Parra-Palomino, A.; Perales-Perez, O.; Singhal, R.; Tomar, M.; Hwang, Jinwoo; Voyles, P. M. (2008)

  The results on the synthesis and characterization of highly monodisperse Fe-doped ZnO nanocrystals are presented. Stable suspensions of these materials were produced in an ethanol solution at room temperature. To promote ...

• Impurity distribution and microstructure of Ga-doped ZnO films grown by molecular beam epitaxy 

  Kvit, A. V.; Yankovich, A. B.; Avrutin, V.; Liu, H.; Izyumskaya, N.; Ozgur, U.; Morkoc, H.; Voyles, P. M. (2012)

  We report microstructural characterization of heavily Ga-doped ZnO (GZO) thin films on GaN and sapphire by aberration-corrected scanning transmission electron microscopy. Growth under oxygen-rich and metal-rich growth ...

• Evaluation of connectivity, flux pinning, and upper critical field contributions to the critical current density of bulk pure and SiC-alloyed MgB2 

  Matsumoto, A.; Kumakura, H.; Kitaguchi, H.; Senkowicz, B. J.; Jewell, M. C.; Hellstrom, E. E.; Zhu, Y.; Voyles, P. M.; Larbalestier, D. C. (2006)

  Measurement of critical current density Jc, normal state resistivity rho_n, and upper critical field Hc2 on pure and 10% SiC-doped MgB2 bulks show systematic enhancement of Hc2 by SiC addition and by lowering reaction ...

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