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Browsing Research and Publications - Department of Metallurgical and Materials Engineering by Title

Now showing items 1-20 of 38

Compositional Dependent Thin Film Stress States

Thompson, G. B.; Fu, B. (2010-08-23)

This paper addresses in situ stress evolution of two-component FexPt1−x, where x spanned 0 to 1, alloy thin films. The stresses of the high-temperature, quenched-in, solid solution phase was determined by in situ wafer ...
Compositional Evolution During the Synthesis of FePt Nanoparticles

Thompson, G. B.; Srivastava, Chandan; Nikles, David E. (2008-09-25)

A series of FePt nanoparticles was synthesized by the thermal decomposition of iron pentacarbonyl and reduction in platinum acetylacetonate in phenyl ether solvent. A range of precursor molar ratios of 2, 1.5, and 1 ...
Design and discovery of a novel half-Heusler transparent hole conductor made of all-metallic heavy elements

Yan, Feng; Zhang, Xiuwen; Yu, Yonggang G.; Yu, Liping; Nagaraja, Arpun; Mason, Thomas O.; Zunger, Alex (2015-06-24)

Transparent conductors combine two generally contradictory physical properties, but there are numerous applications where both functionalities are crucial. Previous searches focused on doping wide-gap metal oxides. ...
Effect of bottom electrodes on nanoscale switching characteristics and piezoelectric response in polycrystalline BiFeO3 thin films

Yan, F.; Zhu, T. J.; Lai, M. O.; Lu, L. (2011-10-17)

We have investigated the nanoscale switching characteristics and piezoelectric response based on polycrystalline BiFeO3 (BFO) thin films with different orientations deposited on different oxide bottom electrodes. The BFO ...
The FePt L10 Phase Transformation in Thin Films using Multiple Laser Pulsing

Inaba, Yuki; Thompson, Gregory B.; Harrell, J. W.; Klemmer, Tim; Kubota, Yukiko (2010-03-04)

A series of ≈12 nm thick FePt thin films deposited onto glass substrates have been annealed with multiple 1064 nm wavelength laser pulses. The fluence was varied using pulse widths of 10.0, 5.0, and 2.5 ms. The peak ...
Ferromagnetic (Mn, N)-codoped ZnO nanopillars array: Experimental and computational insights

Wang, D. D.; Xing, G. Z.; Yan, F.; Yan, Y. S.; Li, S. (2014-01-16)

To reveal the mechanism responsible for ferromagnetism in transition metal and hole codoped oxide semiconductors, we carry out a comparative study on Mn-doped and (Mn, N)-codoped ZnO nanopillars. Compared with Mn-doped ...
Formation Mechanism and Composition Distribution of FePt Nanoparticles

Srivastava, Chandan; Balasubramanian, Jayendra; Turner, C. Heath; Wiest, John M.; Bagaria, Hitesh G.; Thompson, Gregory B. (2007-11-27)

Self-assembled FePt nanoparticle arrays are candidate structures for ultrahigh density magnetic storage media. One of the factors limiting their application to this technology is particle-to-particle compositional variation. ...
Formation of FePt Nanoparticles by Organometallic Synthesis

Bagaria, H. G.; Johnson, D. T.; Srivastava, C.; Thompson, G. B.; Shamsuzzoha, M.; Nikles, D. E. (2007-05-23)

Our interest in determining the mechanism of FePt nanoparticle formation has led to this study of the evolution of particle size and composition during synthesis. FePt nanoparticles were prepared by the simultaneous reduction ...
Grain Boundary Specific Segregation in Nanocrystalline Fe(Cr)

Zhou, Xuyang; Yu, Xiao-xiang; Kaub, Tyler; Martens, Richard L.; Thompson, Gregory B. (2016-10-06)

A cross-correlative precession electron diffraction – atom probe tomography investigation of Cr segregation in a Fe(Cr) nanocrystalline alloy was undertaken. Solute segregation was found to be dependent on grain boundary ...
In Situ Transmission Electron Microscopy of Ion Irradiated Fe-Pt Alloy Thin Films

Thompson, G. B.; Morgan, N. W.; Birtcher, R. C. (2006-12-21)

We report the microstructural evolution during irradiation of FePt and FePt 25at.% thin films sputter deposited onto electron transparent silicon monoxide substrates. The films were studied in situ for 500keV Kr+ irradiation ...
Influence of Fe Underlayers on Stress Evolution of Ti in Ti/Fe Multilayers

Thompson, Gregory B.; Wan, Li (2016-09-07)

A series of 40–2 nm bilayer spacing Ti/Fe multilayers were sputter-deposited. As the length scale of individual Ti layers equaled to 2 nm, Ti phase transforms from a hexagonal close packed (hcp)- to-body centered cubic ...
Influence of Grain Boundary Character and Annealing Time on Segregation in Commercially Pure Nickel

Welsh, Shery L.; Kapoor, Monica; Underwood, Olivia D.; Martens, Richard L.; Thompson, Gregory B.; Evans, Jeffrey L. (2016)

Commercially pure nickel (Ni) was thermomechanically processed to promote an increase in Σ3 special grain boundaries. Engineering the character and chemistry of Σ3 grain boundaries in polycrystalline materials can help in ...
Influence of Surface Roughness on Secondary Electron Emission from Graphite

Burton, Thomas S.; Back, Tyson C.; Fairchild, Steven B.; Thompson, Gregory B. (2017-06-15)

In this study, the authors address how surface roughness alters secondary electron emission. By using specific grades of metallographic polishing pads, controlled levels of roughness and surface features were imparted. As ...
Influence of the Nb Growth Surface on the Allotropic Ti Phase Transformation in Nb/Ti/Nb Nanolaminates

Thompson, Gregory B.; Wan, Li; Yu, Xiao-Xiang (2016-09-14)

As the thickness of a thin film is decreased, the interfacial structure becomes paramount and crystals can undergo phase transformations. Molecular dynamic simulations have been performed to capture how such transformation ...
Interrelationship of in Situ Growth Stress Evolution and Phase Transformations in Ti/W Multilayered Thin Films

Thompson, Gregory B.; Wan, Li; Yu, Xiao-Xiang; Zhou, Xuyang (2016-06-24)

This paper addresses the in situ growth stress evolution and phase transformation of bcc to hcp Ti in Ti/W multilayered thin films. A series of equal layer thicknesses from 20 nm to 1 nm were deposited. As the bilayer ...
L10 Ordering of FePt Thin Films using Sub-10 ms Laser Pulses

Thompson, G. B.; Inaba, Y.; Kang, S.; Izatt, J. R.; Harrell, J. W.; Kubota, Y.; Klemmer, T. J. (2009-03-12)

The structural and magnetic properties of 10 nm FePt thin films annealed using a 1064 nm wavelength laser with 10, 7.5, 5.0, and 2.5 ms pulses have been examined. The A1 to L10 phase transformation was confirmed by x-ray ...
Lattice Expansion in Nanocrystalline Niobium Thin Films

Banerjee, R.; Sperling, E. A.; Thompson, G. B.; Fraser, H. L.; Bose, S.; Ayyub, P. (2003-04-09)

High-purity nanocrystalline niobium (Nb) thin films have been deposited using high-pressure magnetron sputter deposition. Increasing the pressure of the sputtering gas during deposition has systematically led to reduced ...
Local charge writing in epitaxial SmNiO3 thin films

Yan, Feng; Schoofs, Frank; Shi, Jian; Ha, Sieu D.; Jaramillo, R.; Ramanathan, Shriram (2014-02-28)

We have investigated the evolution of work function in epitaxial correlated perovskite SmNiO3 (SNO) thin film spanning the metal-insulator transition (MIT) by Kelvin probe force microscopy (KPFM). Combining contact-mode ...
Local probing of magnetoelectric coupling and magnetoelastic control of switching in BiFeO3-CoFe2O4 thin-film nanocomposite

Yan, Feng; Chen, Guannan; Lu, Li; Finkel, Peter; Spanier, Jonathan E. (2013-07-25)

We report on the combination of piezoresponse force microscopy (PFM), magnetic force microscopy, and local ferroelectric switching with magnetic field for the study of a thin-film magnetoelectric (ME) nanocomposite. The ...
Low temperature dependent ferroelectric resistive switching in epitaxial BiFeO3 films

Yan, F.; Xing, G. Z.; Li, L. (2014-04-02)

The ferroelectric switchable diode induced resistive switching behavior at low temperature has been investigated in the epitaxial BiFeO3 (BFO) thin films. The switchable diode can be tuned using a higher voltage at low ...

Now showing items 1-20 of 38

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Browsing Research and Publications - Department of Metallurgical and Materials Engineering by Title

Browsing Research and Publications - Department of Metallurgical and Materials Engineering by Title

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