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Full-Text Articles in Physical Sciences and Mathematics
Mfm Studies Of Interlayer Exchange Coupling In Co/Ru/Co Films: Effect Of Ru Layer Thickness, Lanping Yue, Zhen Li, Roger D. Kirby, David J. Sellmyer
Mfm Studies Of Interlayer Exchange Coupling In Co/Ru/Co Films: Effect Of Ru Layer Thickness, Lanping Yue, Zhen Li, Roger D. Kirby, David J. Sellmyer
David Sellmyer Publications
Antiferromagnetically coupled magnetic thin films are promising candidates for the design of new magnetic storage and logic devices. The ability to control the interlayer thickness, therefore the magnetic reversal response, of exchange-coupled magnetic layers is of paramount importance in nanotechnology, especially in magnetic sensing element design and applications. In this work, magnetic force microscopy (MFM) with improved sensitivity and high spatial resolution probes was used to obtain a more detailed view of magnetization reversal behavior and domain evolution in the indirect exchange-coupled trilayer system: Co/Ru/Co. The effect of the variable Ru interlayer thickness on the exchange coupling and thus the …
Spectroscopic Investigations On Polypropylene-Carbon Nanofiber Composites: I. Raman And Electron Spin Resonance Spectroscopy, Mircea Chipara, John R. Villarreal, Magdalena Dorina Chipara, Karen Lozano, Alin Cristian Chipara, David J. Sellmyer
Spectroscopic Investigations On Polypropylene-Carbon Nanofiber Composites: I. Raman And Electron Spin Resonance Spectroscopy, Mircea Chipara, John R. Villarreal, Magdalena Dorina Chipara, Karen Lozano, Alin Cristian Chipara, David J. Sellmyer
David Sellmyer Publications
Isotactic polypropylene-vapor grown carbon nanofiber composites containing various fractions of carbon nanofibers, ranging from 0 to 20 wt %, have been prepared. Raman spectroscopy was used to analyze the effect of the dispersion of carbon nanofibers within polypropylene and the interactions between carbon nanofibers and macromolecular chains. The as-recorded Raman spectra have been successfully fitted by a linear convolution of Lorentzian lines. Changes of the Raman lines parameters (position, intensity, width, and area) of polypropylene and carbon nanofibers were analyzed in detail. The Raman spectra of the polymeric matrix—at low concentrations of nanofibers—show important modifications that indicate strong interactions between …
Anisotropic Sm-(Co,Fe) Nanoparticles By Surfactant-Assisted Ball Milling, Nilly Akdogan, George C. Hadjipanayis, David J. Sellmyer
Anisotropic Sm-(Co,Fe) Nanoparticles By Surfactant-Assisted Ball Milling, Nilly Akdogan, George C. Hadjipanayis, David J. Sellmyer
David Sellmyer Publications
Magnetically hard Sm2(Co0.8Fe0.2)17 and SmCo5 nanoparticles have been produced by using surfactant-assisted low- and high-energy ball milling techniques. Surfactants prevent the rewelding of the crashed particles during the milling process. Heptane was used as the milling medium and oleic acid as the surfactant. High-energy ball milling experiments took place in a milling vial with carbon steel balls by using an SPEX 8000M high-energy ball milling machine. The coercivity was found to increase with milling time with values of 2.3 kOe for Sm2(Co0.8Fe0.2)17 and 18.6 kOe …
Igc Fabrication And Tem Characterization Of Mn Nanoparticles, Xingzhong Li, Zhiguang Sun, David J. Sellmyer
Igc Fabrication And Tem Characterization Of Mn Nanoparticles, Xingzhong Li, Zhiguang Sun, David J. Sellmyer
David Sellmyer Publications
The reason for the enormous interest in nanomaterials is because they display unique and superior properties that are generally unavailable in conventional macroscopic materials. Gleiter and coworkers [1] first generated a novel solid structure with gas-like disorder, in addition to long-range order (crystalline and quasicrystalline solids) and short-range order (amorphous/glassy solids). Inert-gas condensation (IGC) is a well established nanoparticle production technique [2-4]. Figure 1 shows an IGC system equipped with magnetron sputter source and mass selector that was used in the present work. The ability to control the process parameters to fabricate metal nanoparticles with tailored size, shape, and properties …
Microstructures And Magnetic Properties Of Rapidly Solidified Ni54Fe27−2xGa19+2x Ferromagnetic Heusler Alloys, S. Aich, S. Das, I. A. Al-Omari, P. Alagarsamy, S. G. Chowdhury, M. Chakraborty, Jeffrey E. Shield, David J. Sellmyer
Microstructures And Magnetic Properties Of Rapidly Solidified Ni54Fe27−2xGa19+2x Ferromagnetic Heusler Alloys, S. Aich, S. Das, I. A. Al-Omari, P. Alagarsamy, S. G. Chowdhury, M. Chakraborty, Jeffrey E. Shield, David J. Sellmyer
David Sellmyer Publications
Rapidly solidified Ni54Fe27−2xGa19+2x (x=0, 1, 2, 3, and 4) ferromagnetic shape memory alloys were made by melt-spinning with variation of Fe and Ga contents to report on the martensitic phase transformation, microstructures, and magnetic properties. Rapid solidification produced pure L21 phase by preventing the formation of γ-phase. To study the effect of heat treatment on the phase transitions, microstructures, and the magnetic properties, the melt-spun ribbons were partly heat treated at different temperatures of 800, 900, 1000, 1100, and 1200 K with holding times of 5, 10, and 15 min followed by either water …