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Michael A. Paesler
North Carolina State University
109Publications
22H-index
2,054Citations
Publications 110
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One of the oft-cited qualities sought after in a potential future engineering employee is an analytical mind that is "continually examining things." In one sense this examination is discouraged in an instructional laboratory employing opaque black box data collection devices. Smartphones can be used to gather such data but also - by their very nature- have the capability of removing the veil of opacity so as to allow students to examine their operation at a very fundamental level. By taking adva...
A variety of simple classical mechanics energy conservation experiments are used in teaching laboratories. Typical one-dimensional (1-D) setups may involve falling balls or oscillating springs. Many of these can be quite satisfying in that students can confirm—within a few percent—that mechanical energy is conserved. Students generally have little trouble identifying discrepancies such as the loss of a few percent of the gravitational potential energy due to air friction encountered by a falling...
Source
#1J. S. Washington (NCSU: North Carolina State University)H-Index: 2
#2Eric A. Joseph (IBM)H-Index: 21
Last.Chung Hon Lam (IBM)H-Index: 17
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The chemical and structural effects of processing on the crystallization of nitrogen doped Ge{sub 2}Sb{sub 2}Te{sub 5} is examined via x-ray photoelectron spectroscopy (XPS), x-ray absorption spectroscopy (XAS), time resolved laser reflectivity, and time resolved x-ray diffraction (XRD). Time resolved laser reflectivity and XRD show that exposure to various etch and ash chemistries significantly reduces the crystallization speed while the transition temperature from the rocksalt to the hexagonal...
10 CitationsSource
#1Gerald Lucovsky (NCSU: North Carolina State University)H-Index: 47
#2Joseph Washington (NCSU: North Carolina State University)H-Index: 2
Last.Michael A. Paesler (NCSU: North Carolina State University)H-Index: 22
view all 4 authors...
The white line and X-ray absorption near edge spectros-copy (XANES) spectral regions of the Ge K edge, ∼11100 to 11112 eV, and between 11112 and 11180 eV and beyond, contain electronic structure information that complements near-neighbor bonding information in the single-scattering EXAFS regime. The multiple-scattering XANES features are not generally addressed in EXAFS studies that are targeted to obtain bonding information. There are systematic changes in the X-ray photon energy of the spectra...
2 CitationsSource
#1G. Lucovsky (NCSU: North Carolina State University)H-Index: 33
#2D. A. Baker (NCSU: North Carolina State University)H-Index: 6
Last.Michael A. Paesler (NCSU: North Carolina State University)H-Index: 22
view all 4 authors...
Ge2Sb2Te5 (GST-225) has emerged as an active medium for applications in reversible, ReWritable (RW) optical memory discs. Many studies have focused on the properties of this alloy, relative to the other GST compositions on tie-lines in the Ge-Sb-Te ternary phase field; (i) Sb2Te to GeTe2: (ii) Sb2Te3: to GeTe; (iii) GeSb to Te: and (iv) the truncated tie-line from GST-124 to Sb. This article focuses instead on the binary atomic join-lines, Te-Ge, Ge-Sb and Sb-Te, that comprise the perimeter of t...
1 CitationsSource
Digital computers use different kinds of memory, each of which is either volatile or nonvolatile. On most computers only the hard drive memory is nonvolatile, i.e., it retains all information stored on it when the power is off. When a computer is turned on, an operating system stored on the hard drive is loaded into the computer's memory cache and system memory. Cache and system memory are volatile, i.e., data in them are lost when the computer is powered down. A more ideal computer would have n...
2 CitationsSource
#1Joseph WashingtonH-Index: 2
#2Eric A. JosephH-Index: 21
Last.Bruce RavelH-Index: 28
view all 13 authors...
2 CitationsSource
#1Michael A. Paesler (NCSU: North Carolina State University)H-Index: 22
#2D. A. Baker (NCSU: North Carolina State University)H-Index: 6
Last.Gerald Lucovsky (NCSU: North Carolina State University)H-Index: 47
view all 3 authors...
Abstract Studies of amorphous (a-) semiconductors have been driven by technological advances as well as fundamental theories. Observation of electrical switching, for example, fueled early interest in a-chalcogenides. More recently a-chalcogenide switching has been applied successfully to programmable memory devices as well as DVD technology where the quest for the discovery of better-suited materials continues. Thus, switching grants researchers today with an active arena of technological as we...
8 CitationsSource
#1S. C. Agarwal (IITs: Indian Institutes of Technology)H-Index: 1
#2Michael A. Paesler (NCSU: North Carolina State University)H-Index: 22
Last.A. Edwards (Kirtland Air Force Base)H-Index: 1
view all 6 authors...
Electronic switching in amorphous chalcogenide semiconductors has been observed and studied for nearly forty years. Technological exploitation of this phenomenon has most recently emerged in DVD’s where GST, a compound of germanium, antimony, and tellurium, is used to store information. We explain how GST behaves as a switch and how X-ray absorption fine structure can be used to unlock the specifics of the switching process. The tool that leads to this deeper understanding is the bond constraint...
9 CitationsSource
#1Gerald Lucovsky (NCSU: North Carolina State University)H-Index: 47
#2D. A. Baker (NCSU: North Carolina State University)H-Index: 6
Last.Michael ThorpeH-Index: 54
view all 5 authors...
This paper extends the scope of semi-empirical bond constraint theory, SE BCT, and uses it provide quantitative information relative the two transitions that bracket intermediate phases in binary and ternary alloys. Reversibility windows have generally been defined in terms of the average bonding coordination, r o (N av , ), and show considerable scatter between different systems when displayed in this way. This paper designates these transitions in terms of the average number of bonding constra...
5 Citations
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