Professor of Physics
Department of Physics and Astronomy
University of Nebraska-Lincoln
Lincoln, Nebraska 68588-0299 United States
Office: 310E Jorgensen Hall
e-mail: sadenwalla1@unl.edu
Phone: (402) 472-2709; fax: (402) 472-6148
Dr. Adenwalla's work involves structural characterization of materials, magnetic systems, polymers and the development of solid state neutron detectors.
In collaborations with Professor Ducharme's group, the structural changes of ferroelectric polymers across the ferroelectric transition are being investigated. The crystallinity of these Langmuir-Blodgett deposited polymers allows a study of their crystal structure and other properties usually attributed only to crystalline materials for, for example, the Debye Temperature, a concerted effort is being made to make a definitive measurement of the crystal structure and all possible phonon modes. We are also looking at interlayer coupling between ferroelectric layers of differing transition temperatures. Recent measurements at the Advanced Photon Source in order to look for coupling show initial evidence that such a coupling does indeed exist.
We have been investigating the effect of magnetic anisotropy on the coupling between ferromagnet and an antiferromagnet. Recently, we have investigated the interlayer coupling in out-of-plane magnetized layers separated by an insulating antiferromagnetic spacer and found evidence of oscillatory coupling. We plan to further investigate this phenomena using a variety of techniques, including x-ray magnetic scattering, transport, MOKE, and neutrons. We are also investigating the properties of sub-micron size features of both single layer and multilayer arrays and the effects of size, spacing and shape on the coupling and magnetic properties of these arrays.
In collaboration with Brian Robertson and Peter Dowben, B5C diodes are being developed for use as solid state neutron detectors. Working diodes have been fabricated and are being tested at a TRIGA medical reactor at the VA Medical Center in Omaha. If successful, these could have major implications for neutron detection, in terms of sensitivity, reliability, size and sturdiness.
2021
Surface acoustic waves increase magnetic domain wall velocity, Anil Adhikari and Shireen Adenwalla
2018
SAW assisted domain wall motion in Co/Pt multilayers, Westin Edrington, Uday Singh, Maya Abo Dominguez, James Rehwaldt Alexander, Rabindra Nepal, and Shireen Adenwalla
2017
Ferroelectricity and the phase transition in large area evaporated vinylidene fluoride oligomer thin films, Keith Foreman, Shashi Poddar, Stephen Ducharme, and Shireen Adenwalla
2016
The Metal/Organic Interface in Cobalt/Vinylidene Fluoride Heterostructures, Keith Foreman, E Echeverria, Mark A. Koten, R. M. Lindsay, N. Hong, Jeffrey E. Shield, and Shireen Adenwalla
Ferroelectric characterization and growth optimization of thermally evaporated vinylidene fluoride thin films, Keith Foreman, N. Hong, C. Labedz, C. Shearer, Stephen Ducharme, and Shireen Adenwalla
Finite-size scaling of flexoelectricity in Langmuir-Blodgett polymer thin films, Shashi Poddar, Keith Foreman, Shireen Adenwalla, and Stephen Ducharme
Local Writing of Exchange Biased Domains in a Heterostructure of Co/Pd Pinned by Magnetoelectric Chromia, Uday Singh, William Echtenkamp, M. Street, Christian Binek, and Shireen Adenwalla
Ferroelectric polymer nanopillar arrays on flexible substrates by reverse nanoimprint lithography, Jingfeng Song, Haidong Lu, Keith Foreman, Shumin Li, Li Tan, Shireen Adenwalla, Alexei Gruverman, and Stephen Ducharme
2015
Fast strain wave induced magnetization changes in long cobalt bars: Domain motion versus coherent rotation, S Davis, J A. Borchers, B B. Maranville, and Shireen Adenwalla
2014
Organic ferroelectric evaporator with substrate cooling and in situ transport capabilities, Keith Foreman, C. Labedz, M. Shearer, and Shireen Adenwalla
2012
Ferroelectric Control of Magnetocrystalline Anisotropy at Cobalt/Poly(vinylidene fluoride) Interfaces, Pavel Lukashev, Tula R. Paudel, Juan M. López-Encarnación, Shireen Adenwalla, Evgeny Y. Tsymbal, and Julian P. Velev
The sweep rate dependence of the electrical control of magnetic coercivity, Abhijit Mardana, Stephen Ducharme, and Shireen Adenwalla
2011
Domain size and structure in exchange coupled [Co/Pt]/NiO/[Co/Pt] multilayers, Andrew G. Baruth and Shireen Adenwalla
Ferroelectric Control of Magnetic Anisotropy, Abhijit Mardana, Stephen Ducharme, and Shireen Adenwalla
2010
Magnetization dynamics triggered by surface acoustic waves, S. Davis, A. Baruth, and Shireen Adenwalla
Ni doping of semiconducting boron carbide, Nina Hong, Marjorie Langell, Jing Liu, Orhan Kizilkaya, and Shireen Adenwalla
Boron carbide based solid state neutron detectors: The effects of bias and time constant on detection efficiency, Nina Hong, John Mullins, Keith Foreman, and Shireen Adenwalla
Magnetoelectric effects in ferromagnetic cobalt/ferroelectric copolymer multilayer films, Abhijit Mardana, Mengjun Bai, A. Baruth, Stephen Ducharme, and Shireen Adenwalla
2008
Enhanced Blocking Temperature and Isothermal Control of Hysteresis Loop Shifts in Co/NiO/[Co/Pt] Heterostructures with Orthogonal Easy Axes, A. Baruth and Shireen Adenwalla
Effects of an external electric field on the ferroelectric-paraelectric phase transition in polyvinylidene fluoride-trifluoroethylene copolymer Langmuir-Blodgett films, Matt Poulsen, A. V. Sorokin, Shireen Adenwalla, Stephen Ducharme, and V. M. Fridkin
2007
The effect of interlayer interactions on the ferroelectric–paraelectric phase transition in multilayered thin films of vinylidene fluoride– trifluoroethylene copolymers, Jihee Kim, Hoydoo You, Stephen Ducharme, and Shireen Adenwalla
The effect of interlayer interactions on the ferroelectric–paraelectric phase transition in multilayered thin films of vinylidene fluoride–trifluoroethylene copolymers, Jihee Kim, Hoydoo You, Stephen Ducharme, and Shireen Adenwalla
2006
Origin of the interlayer exchange coupling in [Co/Pt]/NiO/ [Co/Pt] multilayers studied with XAS, XMCD, and micromagnetic modeling, Andrew Baruth, D.J. Keavney, John D. Burton, Karolina Janicka, Evgeny Y. Tsymbal, Lu Yuan, Sy_Hwang Liou, and Shireen Adenwalla
Domain overlap in antiferromagnetically coupled [Co/Pt]/NiO/ [Co/Pt] multilayers, Andrew Baruth, Lu Yuan, John D. Burton, Karolina Janicka, Evgeny Y. Tsymbal, Sy_Hwang Liou, and Shireen Adenwalla
Electronic structure and vibrational spectra of C2B10-based clusters and films, Kyungwha Park, M. R. Pederson, L. L. Boyer, Wai-Ning Mei, Renat F. Sabirianov, Xiao Cheng Zeng, Satya S. Bulusu, Seamus Curran, James Dewald, Ellen Day, Shireen Adenwalla, Manuel Diaz, Luis G. Rosa, Snjezana Balaz, and Peter A. Dowben
2005
Boron-Rich Semiconducting Boron Carbide Neutron Detector, Andrew D. Harken, Ellen E. Day, Brian W. Robertson, and Shireen Adenwalla
Investigation of Ferroelectricity in Newly Synthesized Nitrile Polymer Systems, Matt Poulsen, Stephen Ducharme, Alexander V. Sorokin, Sahadeva Reddy, James M. Takacs, Y. Wen, Jihee Kim, and Shireen Adenwalla
2004
BORON-CARBIDE SOLID STATE NEUTRON DETECTOR AND METHOD OF USING THE SAME, Peter A. Dowben, Shireen Adenwalla, Brian W. Robertson, and Mengjun Bai
Oscillatory interlayer exchange coupling in [Pt/Co]n/NiO/[Co/Pt]n multilayers with perpendicular anisotropy: Dependence on NiO and Pt layer thicknesses, Z. Y. Liu, Lanping Yue, D. J. Keavney, and Shireen Adenwalla
2003
Ferromagnetic domain-wall behavior during reversal and thermally activated antiferromagnetic reversal in an exchange-biased NiO/NiFe bilayer, Z. Y. Liu and Shireen Adenwalla
Oscillatory Interlayer Exchange Coupling and Its Temperature Dependence in [Pt/Co]3/NiO/[Co/Pt]3 Multilayers with Perpendicular Anisotropy, Z. Y. Liu and Shireen Adenwalla
Angular dependence of magnetization reversal process in exchange coupled ferromagnetic/antiferromagnetic bilayers, Z.Y. Liu and Shireen Adenwalla
Closely linear temperature dependence of exchange bias and coercivity in out-of-plane exchange-biased [Pt/Co] 3/NiO (11 Å) multilayer, Z.Y. Liu and Shireen Adenwalla
Out-of-plane exchange coupling between epitaxial Ni(50 Å) and NiO(600 Å) bilayers, Z.Y. Liu and Shireen Adenwalla
Variation of domain formation in a 15 nm NiFe layer exchange coupled with NiO layers of different thicknesses, Z.Y. Liu and Shireen Adenwalla
2002
Neutron Powder Diffraction Studies of the La0.65Pb0.35MnO3 Perovskite, Camelia Borca, Shireen Adenwalla, Sy-Hwang Liou, Q.L. Xu, J. L. Robertson, and Peter A. Dowben
A class of boron-rich solid-state neutron detectors, B. W. Robertson, Shireen Adenwalla, A. Harken, P. Welsch, Jennifer I. Brand, Peter A. Dowben, and J.P. Claassen
2001
Boron carbide/n-silicon carbide heterojunction diodes, Shireen Adenwalla, P. Welsch, A. Harken, Jennifer I. Brand, A. Sezer, and Brian W. Robertson
Changes in Electron-Phonon Coupling Across a Bulk Phase Transition in Copolymer Films of Vinylidene Fluoride (70%) with Trifluoroethylene (30%), C.N. Borca, Shireen Adenwalla, Jaewu Choi, Lee Robertson, H. You, V.M. Fridkin, S.P. Palto, N. Petukhova, and Peter A. Dowben
2000
The surface terminal layer and composition of the colossal magnetoresistance perovskite: La0.65Pb0.35MnO3, C.N. Borca, Delia Ristoiu, Q.L. Xu, Sy_Hwang Liou, Shireen Adenwalla, and Peter A. Dowben
Magnetic spectroscopy and characterization of La0.65Pb0.35MnO3, M. I. Chipara, Shireen Adenwalla, Peter A. Dowben, Qin Lan Xu, Sy_Hwang Liou, and R. Shoemaker
ESR investigations on Ca perovskite, M. Chipara, Sy-Hwang Liou, C.N. Borca, R. Shoemaker, Shireen Adenwalla, and Peter A. Dowben
Phase transition in the surface structure in copolymer films of vinylidene fluoride (70%) with trifluoroethylene (30%), Jaewu Choi, C.N. Borca, Peter A. Dowben, A. Bune, Matt Poulsen, Shane Pebley, Shireen Adenwalla, Stephen Ducharme, Lee Robertson, V.M. Fridkin, N.N. Petukhova, and S.G. Yudin
1999
Lattice-Stiffening Transition in Copolymer Films of Vinylidene Fluoride (70%) with Trifluoroethylene (30%), C.N. Borca, Shireen Adenwalla, Jaewu Choi, P.T. Sprungerr, Stephen Ducharme, Lee Robertson, S.P. Palto, Jianglai Liu, Matt Poulsen, V.M. Fridkin, H. You, and Peter A. Dowben
Influence of dynamical scattering in crystalline poly„vinylidene, C.N. Borca, Jaewu Choi, Shireen Adenwalla, Stephen Ducharme, Peter A. Dowben, Lee Robertson, V.M. Fridkin, S.P. Palto, and N. Petukhova
Evidence of dynamic Jahn-Teller distortions in two-dimensional crystalline molecular films, Jaewu Choi, Peter A. Dowben, C.N. Borca, Shireen Adenwalla, A.V. Bune, Stephen Ducharme, V.M. Fridkin, S.P. Palto, and N. Petukhova
1997
Magnetic response of FeF2 films on (100) MgO (abstract), Shireen Adenwalla, G. P. Felcher, J. Nogués, and I. K. Schuller
Neutron standing wave resonator to measure the flux line lattice in thin film superconducting samples (abstract), Shireen Adenwalla, E. E. Fullerton, and G. P. Felcher
1996
Polarized-neutron-reflectivity confirmation of 90° magnetic structure in Fe/Cr(001) superlattices, Shireen Adenwalla, G. P. Felcher, Eric E. Fullerton, and S. D. Bader
Suppression of biquadratic coupling at the Cr Néel temperature in Fe/Cr(001) superlattices (invited) (abstract), Eric E. Fullerton, Shireen Adenwalla, G. Felcher, C. H. Sowers, S. D. Bader, J. L. Robertson, and A. Berger
1995
Retrieval of phase information in neutron reflectometry, V.-O. de Haan, A. A. van Well, Shireen Adenwalla, and G. P. Felcher
Characterization of piezoceramic crosses with large range scanning capability and applications for low temperature scanning tunneling microscopy, J. A. Helfrich, Shireen Adenwalla, J. B. Ketterson, and G. A. Zhitomirsky
Superparamagnetic relaxation of Fe deposited on MgO(001), Yongsup Park, Shireen Adenwalla, G. P. Felcher, and S. D. Bader
1994
Magnetic response of ultrathin Fe on MgO: A polarized neutron reflectometry study, Shireen Adenwalla, Yongsup Park, G. P. Felcher, and M. Teitelman
1992
Thermodynamics of the UPt3 superconducting phase diagram, Shireen Adenwalla, J. B. Ketterson, S. K. Yip, S. W. Lin, M. Levy, and Bimal K. Sarma
Ultrasonic measurements in superconducting UPt3, Shireen Adenwalla, S.-W. Lin, Z. Zhao, J. B. Ketterson, M. Levy, and Bimal K. Sarma
1991
Critical fields and Landau-Ginzburg parameters of the heavy-fermion superconductor UPt3, Zuyu Zhao, F. Behroozi, Shireen Adenwalla, Y. Guan, and J. B. Ketterson
1990
Phase Diagram of UPt3 from Ultrasonic Velocity Measurements, Shireen Adenwalla, S. W. Lin, Q. Z. Ran, Z. Zhao, J. B. Ketterson, J. A. Sauls, L. Taillefer, D. G. Hinks, M. Levy, and Bimal K. Sarma
Resolution of a Doublet Splitting of the Squashing Mode in Superfluid 3He-B, Zuyu Zhao, Shireen Adenwalla, P. N. Brusov, J. B. Ketterson, and Bimal K. Sarma
1989
Measurements of the Pair-Breaking Edge in Superfluid 3He-B, Shireen Adenwalla, Z. Xhao, J. B. Ketterson, and Bimal K. Sarma
Pair breaking edge in superfluid 3He, Shireen Adenwalla, Z. Zhao, J. B. Ketterson, and B. K. Sarma
Ultrasonic attenuation measurements on the heavy fermion superconductor UPt3, B. K. Sarma, M. Levy, A. Schenstrom, Y-J. Qian, M.-F. Xu, Shireen Adenwalla, J. B. Ketterson, Z. Zhao, and D. Hinks
Anisotropy of the Magnetic-Field-Induced Phase Transition in Superconducting UPt3, A. Schenstrom, M-F. Xu, Y. Hong, D. Bein, M. Levy, Bimal K. Sarma, Shireen Adenwalla, Z. Zhao, T. Tokuyasu, D. W. Hess, J. B. Ketterson, J. A. Sauls, and D. G. Hinks
Ultrasonic attenuation measurements in sinter-forged YBa2Cu3O7-b, M-F. Xu, D. Bein, R. F. Wiegert, Bimal K. Sarma, M. Levy, Z. Zhao, Shireen Adenwalla, A. Moreau, Q. Robinson, D. L. Johnson, S.-J. Hwu, K. R. Poeppelmeier, and J. B. Ketterson
Observation of a doublet splitting of the squashing mode in superfluid 3He-B, Z. Zhao, Shireen Adenwalla, P. N. Brusov, J. B. Ketterson, and B. K. Sarma
Ultrasonic velocity anomalies in superconducting sinter-forged YBa2Cu3O7-b, Z. Zhao, Shireen Adenwalla, A. Moreau, J. B. Ketterson, Q. Robinson, D. L. Johnson, S.-J. Hwu, K. R. Poeppelmeier, M-F. Xu, Y. Hong, R. F. Wiegert, M. Levy, and Bimal K. Sarma
1988
Ultrasonic attenuation and velocity investigation of sinter-forged superconducting YBa2Cu3O7, M. Levy, B. K. Sarma, M.-F. Xu, Shireen Adenwalla, Z. Zhao, Q. Robinson, and J. B. Ketterson