UAB DEPARTMENT OF PHYSICS

 

Lowell Wenger Lowell E. Wenger
Professor of Physics

Office: Campbell Hall 305

Office phone: (205) 934-8659

Office fax: (205) 934-8042

E-mail: wenger@uab.edu


B.S. 1971, M.S. 1973, Ph.D. 1975 - Purdue University


Curriculum Vitae

Address:

    305 Campbell Hall

    1300 University Blvd.

    The University of Alabama at Birmingham

    Birmingham, AL 35294-1170

Teaching Activity:
Hysteresis Research Activity:
My research effort focuses on two areas of condensed matter physics: magnetic properties of solids and superconductivity. The magnetic studies focus on the fabrication and characterization of magnetic nanoparticles, nanowires and other nanostructures as well as of bulk materials including their properties under high pressure (< 15 GPa). In these studies, we utilize a variety of measurement techniques including SQUID magnetometry, ac susceptibility, and resistivity as well as structural characterization by X-ray diffraction and scanning electron microscopy. We are also interested in the development of these magnetic nanostructured materials and techniques for potential biomedical applications. The superconductivity research focuses on understanding of the various physical phenomena, such as electrical, magnetic, and electrodynamic effects associated with both conventional metallic superconductors and high-temperature superconductors, and the synthesis of novel materials for increasing the superconducting transition temperature.

Recent Research Papers:

  • "Pressure-induced Superconductivity in Ba0.5Sr0.5Fe2As2", G.M. Tsoi, W. Malone, W.O. Uhoya, J.E. Mitchell, Y.K. Vohra, L.E. Wenger, A.S. Sefat, and S.T. Weir, J. Phys.: Condens. Matter 24, 495702-5 (2012).

  • "Neutron Diffraction and Electrical Transport Studies on the Incommensurate Magnetic Phase Transition in Holmium at High Pressures", S.A. Thomas, W.O. Uhoya, G.M. Tsoi, L.E. Wenger, Y.K. Vohra, G.N. Chestnut, S.T. Weir, C.A. Tulk, and A.F. Moriera Dos Santos, J. Phys.: Condens. Matter 24, 216003-6 (2012).

  • "Magnetic Properties of Single Crystal EuCo2As2", J. Ballinger, L.E. Wenger, Y.K. Vohra, and A.S. Sefat, J. Appl. Phys. 111, 07E106-3 (2012).

  • "Magnetic Transitions in Erbium at High Pressures", S.A. Thomas, G.M. Tsoi, L.E. Wenger, Y.K. Vohra, and S.T. Weir, J. Appl. Phys. 111, 07E104-3 (2012).

  • "Temperature and Concentration Quenching of Mid-IR Photoluminescence in Iron Doped ZnSe and ZnS Laser Crystals", N.S. Myoung, V.V. Fedorov, S.B. Mirov, and L.E. Wenger, J. Luminescence 132, 600-606 (2012).

  • "Magnetic and Structural Phase Transitions in Erbium at Low Temperatures and High Pressures", S.A. Thomas, G.M. Tsoi, L.E. Wenger, Y.K. Vohra, and S.T. Weir, Phys. Rev. B 84, 144415-5 (2011).

  • "Magnetic Properties of Chalcogenide Spinel CuCr2Se4 Nanocrystals", G.M. Tsoi, L.E. Wenger, Y.-H.A. Wang, and A. Gupta, J. Magn. Magn. Mater. 322, 142-147 (2010).

    Magnetometer

  • "Ternary Heterostructured Phosphide Nanoparticles: MnP@InP", K. Somaskandan, K. Gregg, G.M. Tsoi, L.E. Wenger, and S.L. Brock, J. Mater. Chem. 20, 375-380 (2010).

  • "XPS and Magnetic Studies of Vanadium Tellurite Glasses", A. Mekki, G.D. Khattak, and L.E. Wenger, J. Electron Spectroscopy & Related Phenomena 175, 21-26 (2009).

  • "X-ray Photoelectron Spectroscopy (XPS) and Magnetic Susceptibility Studies of Vanadium Phosphate Glasses", G.D. Khattak, A. Mekki, and L.E. Wenger,J. Non-Crystal. Solids 355, 2148-2155 (2009).

  • "Magnetic Properties of g-Fe2O3 Nanoparticles Precipitated in Alginate Hydrogels", L.E. Wenger, G.M. Tsoi, P.P. Vaishnava, U. Senaratne, E.C. Buc, R. Naik, and V.M. Naik, IEEE Trans. Magnetics 44, 2760-2763 (2008).

  • "Effect of Cr-doping on the Magnetic and Electrical Properties of La0.4Ca0.6MnO3", L.E. Wenger, G.M. Tsoi, R. Suryanarayanan, and T. Sudyuodsak, J. Appl. Phys. 103, 07F723 (2008).

    Nanowires

  • "Investigation of Magnetic Interactions in Large Arrays of Magnetic Nanowires", P.S. Fodor, G.M. Tsoi, and L.E. Wenger, J. Appl. Phys. 103, 07B713 (2008).

  • "Phase Segregation of MnP in Chalcopyrite Dilute Magnetic Semiconductors: A Cautionary Tale", J.A. Aitken, G.M. Tsoi, L.E. Wenger, and S.L. Brock,Chem. Mater. 19, 5272-5278 (2007).

  • "Magnetic Properties of g-Fe2O3 Nanoparticles Incorporated in a Polystyrene Resin Matrix", P.P. Vaishnava, U. Senaratne, E.C. Buc, R. Naik, V.M. Naik, G.M. Tsoi, and L.E. Wenger, Phys. Rev. B 75, 0214413-10 (2007).

  • "Synthesis and Characterization of Sr-doped Lanthanum Manganite Nanoparticles", N.D. Lipham, G.M. Tsoi, and L.E. Wenger, IEEE Trans. Magnetics 43, 3088-3090 (2007).

  • "Magnetic Properties of Cobalt-Ferrite Nanoparticles Embedded in Polystyrene Resin", P.P. Vaishnava, U. Senaratne, E. Buc, R. Naik, V.M. Naik, G. Tsoi, L.E. Wenger, and P. Boolchand, J. Appl. Phys. 99, 08G702-3 (2006).

    Susceptometer

  • "Structural and Magnetic Investigations of Fe2O3-TeO2 Glasses", A. Mekki, G.D. Khattak, and L.E. Wenger, J. Non-Crystal. Solids 352, 3326-3331 (2006).

  • "Structural Properties of Strontium-Vanadate and Strontium-Borovanadate Glasses", G.D. Khattak, N. Tabet, and L.E. Wenger, Phys. Rev. B 72, 104203-6 (2005).

  • "Structural and Magnetic Properties of MoO3-TeO2 Glasses", A. Mekki, G.D. Khattak, and L.E. Wenger,  J. Non-Crystal. Solids 351, 2493-2500 (2005).

  • "Solid-State Structures and Magnetic Properties of Halide-Bridged, Face-to-face bis-Nickel(II-Macrocyclic Ligand Complexes. Ligand Mediated Interchanges of Electronic Configurations", K.T. Szacilowski, P. Xie, Y.S. Malkhasian, M.J. Heeg, M.Y. Udugala-Ganehenege, L.E. Wenger, and J.F. Endicott,  Inorganic Chemistry 44, 6019-6033 (2005).

  • "Memory Effects in a Superparamagnetic g-Fe2O3 System", G.M. Tsoi, L.E. Wenger, U. Seraratne, R.J. Tackett, E.C. Buc, R. Naik, P.P. Vaishnava, and V. Naik,  Phys. Rev. B 72, 014445-8 (2005).

    Nanoparticles

  • "Memory Effects and Magnetic Interactions in g-Fe2O3 Nanoparticle System", G.M. Tsoi, U. Seraratne, R.J. Tackett, E.C. Buc, R. Naik, P.P. Vaishnava, V.M. Naik, and L.E. Wenger,  J. Appl. Phys. 97, 10J507-3 (2005).

  • "Magnetic Properties of Nanosized Iron Oxide Particles Precipitated in Alginate Hydrogels", R. Naik, U. Senaratne, N. Powell, E.C. Buc, G.M. Tsoi, V.M. Naik, P.P. Vaishnava, and L.E. Wenger,  Chem. Mater. 17, 1190-1198 (2005).

  • "Isovalent Doping Strategy for Manganese Introduction into III-V Diluted Magnetic Semiconductor Nanoparticles: InP:Mn", K. Somaskandan, G.M. Tsoi, L.E. Wenger, and S.L. Brock,  J. Appl. Phys. 97, 10J313-3 (2005).

  • "Local Structure and Redox State of Copper in Tellurite Glasses", G.D. Khattak, A. Mekki, and L.E. Wenger, J. Non-Crystal. Solids 337, 174-181 (2004).

  • "Mesostructured Fe Oxide Synthesized by Ligand Assisted Templating with a Chelating Triol Surfactant", A. Lezau, M. Trudeau, G.M. Tsoi, L.E. Wenger, and D. Antonelli,  J. Phys. Chem. B 108, 5211-5216 (2004).

  • "Suppression of Charge-Ordering and Appearance of Magnetoresistance in a Spin-Cluster Glass Manganite La0.3Ca0.7Mn0.8Cr0.2O3", T. Sudyoadsuk, R. Suryanarayanan, P. Winotai, and L.E. Wenger, J. Magn. Magn. Mater. 278, 96-106 (2004).

  • "Magnetic Properties of Iron-Oxide and (Iron, Cobalt)-Oxide Nanoparticles Synthesized in Polystyrene Resin Matrix", R. Naik, E. Kroll, D. Rodak, G.M. Tsoi, E. McCullen, L.E. Wenger, R. Suryanarayanan, V.M. Naik, P.P. Vaishnava, Q. Tao, and P. Boolchand, J. Magn. Magn. Mater. 272-276, e1239-e1241 (2004).

  • "Optical and Electrical Properties of Low to Highly-Degenerate InN Films", D.B. Haddad, H. Dai, R. Naik, C. Morgan, V.M. Naik, J.S. Thakur, G.W. Auner, L.E. Wenger, H. Lu, and W.J. Schaff, Mat. Res. Symp. Proc. 798, Y12.7.1-6 (2004).

  • "Synthesis of MnP Nanocrystals by Treatment of Metal Carbonyl Complexes with Phosphines: A New, Versatile Route to Nanoscale Transition Metal Phosphides", S.C. Perera, G.M. Tsoi, L.E. Wenger, and S.L. Brock, J. Am. Chem. Soc. 125, 13960-13961 (2003).

  • "Application of De-silylation Strategies to the Preparation of Transition Metal Pnictide Nanocrystals: The Case of FeP", S.C. Perera, P.S. Fodor, G.M. Tsoi, L.E. Wenger, and S.L. Brock, Chem. Mater. 15, 4034-4038 (2003).

  • "Structure and Magnetic Properties of Lead Vanadate Glasses", A. Mekki, G.D. Khattak, P.S. Fodor, and L.E. Wenger, J. Non-Crystal. Solids 330, 156-167 (2003).

  • "Modeling of Hysteresis and Magnetization Curves for Hexagonally Ordered Electrodeposited Nanowires", P.S. Fodor, G.M. Tsoi, and L.E. Wenger, J. Appl. Phys. 93, 7438-7440 (2003).

  • "Zero Magnetization States in Electrodeposited Co0.45Fe0.55 Nanowire Arrays", P.S. Fodor, G.M. Tsoi, and L.E. Wenger, J. Appl. Phys. 93, 7035-7037 (2003).

  • "Structure and Magnetic Properties of Vanadium Silicate Glasses", A. Mekki, G.D. Khattak, D. Holland, M. Chinkhota, and L.E. Wenger, J. Non-Crystal. Solids 318, 193-201 (2003).

  • "X-ray Photoelectron Spectroscopy (XPS) Studies of Copper-Sodium Tellurite Glasses", M.A. Salim, G.D. Khattak, N. Tabet, and L.E. Wenger, J. Electron Spectroscopy & Related Phenomena 128, 75-83 (2003).

  • "Determination of Magnetic Exchange Stiffness and Surface Anisotropy Constants in Epitaxial Ni1-xCux(001) Films", P. Talagala, P. Fodor, D. Haddad, R. Naik, L.E. Wenger, P.P. Vaishnava, and V.M. Naik, Phys. Rev. B 66, 144426-6 (2002).

  • "Thermal Hysteresis In the Charge-Density-Wave Transition of Lu5Rh4Si10", C.S. Lue, F.H. Hsu, H.H. Li, H.D. Yang, Y.-K. Kuo, P.S. Fodor, and L.E. Wenger, Phys. Rev. B 66, 033101-4 (2002).

  • "Investigation of the Magnetic Properties in Strontium-Borate Vanadate Glasses", M. Chinkhota, P.S. Fodor, G.D. Khattak, and L.E. Wenger, J. Appl. Phys. 91, 8269-8271 (2002).

  • "Fabrication and Characterization of Co(1-x)Fex Alloy Nanowires", P.S. Fodor, G. Tsoi, and L.E. Wenger, J. Appl. Phys. 91, 8186-8188 (2002).

  • "Comparative Study of Stripe Magnetic Domains in Epitaxial Ni(111) and Co(0001) Films", R. Naik, S. Hameed, P. Talagala, R. Naik, V.M. Naik, and L.E. Wenger, J. Appl. Phys. 91, 7550-7552 (2002).

  • "A Study of Disordered Stripe Magnetic Domains Observed in Epitaxial Ni Films", S. Hameed, P. Talagala, R. Naik, L.E. Wenger, and V.M. Naik, J. Magn. Magn. Mater. 242-245, 1264-1266 (2002).

  • "X-ray Photoelectron Spectroscopy (XPS) and Magnetization Studies of Iron-Vanadium Phosphate Glasses", M.A. Salim, G.D. Khattak, Petru S. Fodor, and L.E. Wenger, J. Non-Crystal. Solids 289, 185-195 (2001).

  • "Analysis of Disordered Stripe Magnetic Domains in Strained Epitaxial Ni (001) Films", S. Hameed, P. Talagala, R. Naik, L.E. Wenger, V.M. Naik, and R. Proksch, Phys. Rev. B 64, 184406-6 (2001).

  • "Electron/Atom Transfer in Halo-Bridged Homobimetallic Complexes: Structure and Donor-Acceptor Properties of Face-to-Face Dicopper Complexes with Tetra-azamacrocyclic Ligands", Manawadevi Y. Udugala-Ganahenege, Mary Jane Heeg, Lew M. Hryhorczuk, L.E. Wenger, and John F. Endicott, Inorganic Chemistry 40, 1614-1625 (2001).

  • "Paramagnetic Meissner Effect In Nb Disks", Petru S. Fodor and L.E. Wenger, Physica C 341-348, 2043-2044 (2000).

  • "Investigation of the Paramagnetic Meissner Effect on Nb Disks", L.E. Wenger, L. Pust, and M.R. Koblischka,  Physica B 284-288, 797-798 (2000).

  • "Soft Magnetic Properties of Fe-(1% wt) Al Alloy Processed by Powder Metallurgy", Susil K. Putatunda, T. Nielsen , P. Talagala, R. Naik, and L.E. Wenger, Materials and Manufacturing Processes 15, 405-418 (2000).

  • "X-ray Photoelectron Spectroscopy (XPS) and Magnetization Studies of Copper-Vanadium Phosphate Glasses", G.D. Khattak, M.A. Salim, L.E. Wenger, and A.H. Gilani, J. Non-Crystal. Solids 262, 66-79 (2000).

    Recent Theses:

    • Upul Senaratne, "Synthesis and Characterization of Magnetic Oxide Nanoparticles in Polymer Matrices" (Ph.D.,2004) co-advisor

    • Daniel J. Rodak, "In-Situ Preparation and Characterization of Magnetic Nanoparticles" (M.S.,2004) co-advisor

    • Petru S. Fodor, "Study of Magnetic Nanostructures in Hexagonally Ordered Porous Alumina" (Ph.D.,2003)

    • Rick E. Soltis, "Investigations into the Theory and Applications of Oxygen Sensors Based on the Zirconia Electrochemical Cell" (Ph.D.,1999)

    • David J. Thompson, "Studies of the Paramagnetic Meissner Effect in Nb Disks" (Ph.D.,1996)

    • Jonathan Obien, "Synthesis and Characterization of YBaCuO Materials Exhibiting a Magnetic Anomaly at 336 K" (Ph.D.,1996)

    • David J. Kubinski, "Dependence of Giant Magnetoresistance on the Size and Composition of Ferromagnetic 3d-Metal Precipitates in an Ag Matrix" (Ph.D.,1995)

    • M.S.M. Minhaj, "Fabrication and Magnetic Characterization of Layered Superconductors" (Ph.D.,1994)

    • Kent J. Chang, "Electrodynamic Response of High Tc Oxide Thin Films to Microwave Radiation" (Ph.D.,1994).

    • John P. Hilburger, "Suppression of Diamagnetic Susceptibility in Various Shaped Superconductors" (M.A.,1992).

    • Laurence L. Henry, "Calorimetric and Magnetic Study of the Ho(Co1-xRhx)2 System in the 2 K to 95 K Temperature Range" (Ph.D.,1991).

    • Mir Wali, "Electrical and Magnetic Characterization of YBa2-xSrxCu3Ox and YBa2Cu3O7:Y2BaCuO5 Composites" (M.S.,1990).

    • Winston Win, "Investigation of the Microstructure in Copper-Oxide Superconductors by the ac Susceptibility Method" (Ph.D.,1990).

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