4 documents found, page 1 of 1
A compact dication source for Ba2+ tagging and heavy metal ion sensor development
Navarro, K.E.; Baeza-Rubio, J.; Boyd, M.; Foss, F.W.; Giri, S.; Jones, B.J.P.; Miller, R.L.; Nygren, D.R.; Samaniego, F.J.; Stogsdill, K.We present a tunable metal ion beam that delivers controllable ion currents in the picoamp range for testing of dry-phase ion sensors. Ion beams are formed by sequential atomic evaporation and single or multiple electron impact ionization, followed by acceleration into a sensing region. Controllability of the ionic charge state is achieved through tuning of electrode potentials that influence the retention time...
Strain induced enhanced ferromagnetic behavior in inhomogeneous low doped La0.9...
Das, S.; Amaral, J. S.; De, K.; Willinger, M.; Gonçalves, J. N.; Roy, A.; Dhak, P.; Giri, S.; Majumder, S.; Silva, Carlos J. R.; Gomes, M. J. M.We report an unusual high-temperature ferromagnetic transition in bulk single-phase nanocrystalline La0.95Sr0.05MnO3þd, achieved through localized strain and inhomogeneous Sr-doping. Magnetization measurements show a well defined transition at 290 K and a broad one at 150 K. HRTEM imaging reveals the strain on the highly crystalline nanometer sized grains and Sr-doping gradients, while oxygen homogeneity at the...
Strain induced enhanced ferromagnetic behavior in inhomogeneous low doped La0.9...
Das, S.; Amaral, J. S.; De, K.; Willinger, M.; Goncalves, J. N.; Roy, A.; Dhak, P.; Giri, S.; Majumder, S.; Silva, C. J. R.; Gomes, M. J. M.We report an unusual high-temperature ferromagnetic transition in bulk single-phase nanocrystalline La0.95Sr0.05MnO3+delta, achieved through localized strain and inhomogeneous Sr-doping. Magnetization measurements show a well defined transition at 290K and a broad one at similar to 150 K. HRTEM imaging reveals the strain on the highly crystalline nanometer sized grains and Sr-doping gradients, while oxygen homo...
Enhanced ferromagnetism and glassy state in phase separated La0.95Sr0.05MnO3 + δ
De, K.; Das, S.; Roy, A.; Dhak, P.; Willinger, M.; Amaral, J. S.; Amaral, V. S.; Giri, S.; Majumder, S.; Silva, Carlos J. R.; Gomes, M. J. M.Unusual high temperature ferromagentism is reported for La0.95Sr0.05MnO3+δ with Curie temperatures (TC1 and TC2) TC1 at 290 K and TC2 ∼ 150 K. Weak antiferromagnetism (AFM) is thought to give low moment, low temperature irreversibility, and non-saturation up to 10 T at 5 K. A short-range ferromagnetism is predicted from well-defined hysteresis at 5 K and field-cooled (FC) magnetization curves. Strong irreversib...