Shireen Adenwalla
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.

Follow


2021

PDF

Surface acoustic waves increase magnetic domain wall velocity, Anil Adhikari and Shireen Adenwalla

2018

PDF

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

PDF

Ferroelectricity and the phase transition in large area evaporated vinylidene fluoride oligomer thin films, Keith Foreman, Shashi Poddar, Stephen Ducharme, and Shireen Adenwalla

2016

PDF

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

PDF

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

PDF

Finite-size scaling of flexoelectricity in Langmuir-Blodgett polymer thin films, Shashi Poddar, Keith Foreman, Shireen Adenwalla, and Stephen Ducharme

PDF

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

PDF

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

PDF

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

PDF

Organic ferroelectric evaporator with substrate cooling and in situ transport capabilities, Keith Foreman, C. Labedz, M. Shearer, and Shireen Adenwalla

2012

PDF

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

PDF

The sweep rate dependence of the electrical control of magnetic coercivity, Abhijit Mardana, Stephen Ducharme, and Shireen Adenwalla

2011

PDF

Domain size and structure in exchange coupled [Co/Pt]/NiO/[Co/Pt] multilayers, Andrew G. Baruth and Shireen Adenwalla

PDF

Ferroelectric Control of Magnetic Anisotropy, Abhijit Mardana, Stephen Ducharme, and Shireen Adenwalla

2010

PDF

Magnetization dynamics triggered by surface acoustic waves, S. Davis, A. Baruth, and Shireen Adenwalla

PDF

Ni doping of semiconducting boron carbide, Nina Hong, Marjorie Langell, Jing Liu, Orhan Kizilkaya, and Shireen Adenwalla

PDF

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

PDF

Magnetoelectric effects in ferromagnetic cobalt/ferroelectric copolymer multilayer films, Abhijit Mardana, Mengjun Bai, A. Baruth, Stephen Ducharme, and Shireen Adenwalla

2008

PDF

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

PDF

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

PDF

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

PDF

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

PDF

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

PDF

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

PDF

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

PDF

Boron-Rich Semiconducting Boron Carbide Neutron Detector, Andrew D. Harken, Ellen E. Day, Brian W. Robertson, and Shireen Adenwalla

PDF

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

PDF

BORON-CARBIDE SOLID STATE NEUTRON DETECTOR AND METHOD OF USING THE SAME, Peter A. Dowben, Shireen Adenwalla, Brian W. Robertson, and Mengjun Bai

PDF

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

PDF

Ferromagnetic domain-wall behavior during reversal and thermally activated antiferromagnetic reversal in an exchange-biased NiO/NiFe bilayer, Z. Y. Liu and Shireen Adenwalla

PDF

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

PDF

Angular dependence of magnetization reversal process in exchange coupled ferromagnetic/antiferromagnetic bilayers, Z.Y. Liu and Shireen Adenwalla

PDF

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

PDF

Out-of-plane exchange coupling between epitaxial Ni(50 Å) and NiO(600 Å) bilayers, Z.Y. Liu and Shireen Adenwalla

PDF

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

PDF

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

PDF

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

PDF

Boron carbide/n-silicon carbide heterojunction diodes, Shireen Adenwalla, P. Welsch, A. Harken, Jennifer I. Brand, A. Sezer, and Brian W. Robertson

PDF

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

PDF

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

PDF

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

PDF

ESR investigations on Ca perovskite, M. Chipara, Sy-Hwang Liou, C.N. Borca, R. Shoemaker, Shireen Adenwalla, and Peter A. Dowben

PDF

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

PDF

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

PDF

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

PDF

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

PDF

Magnetic response of FeF2 films on (100) MgO (abstract), Shireen Adenwalla, G. P. Felcher, J. Nogués, and I. K. Schuller

PDF

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

PDF

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

PDF

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

PDF

Retrieval of phase information in neutron reflectometry, V.-O. de Haan, A. A. van Well, Shireen Adenwalla, and G. P. Felcher

PDF

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

PDF

Superparamagnetic relaxation of Fe deposited on MgO(001), Yongsup Park, Shireen Adenwalla, G. P. Felcher, and S. D. Bader

1994

PDF

Magnetic response of ultrathin Fe on MgO: A polarized neutron reflectometry study, Shireen Adenwalla, Yongsup Park, G. P. Felcher, and M. Teitelman

1992

PDF

Thermodynamics of the UPt3 superconducting phase diagram, Shireen Adenwalla, J. B. Ketterson, S. K. Yip, S. W. Lin, M. Levy, and Bimal K. Sarma

PDF

Ultrasonic measurements in superconducting UPt3, Shireen Adenwalla, S.-W. Lin, Z. Zhao, J. B. Ketterson, M. Levy, and Bimal K. Sarma

1991

PDF

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

PDF

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

PDF

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

PDF

Measurements of the Pair-Breaking Edge in Superfluid 3He-B, Shireen Adenwalla, Z. Xhao, J. B. Ketterson, and Bimal K. Sarma

PDF

Pair breaking edge in superfluid 3He, Shireen Adenwalla, Z. Zhao, J. B. Ketterson, and B. K. Sarma

PDF

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

PDF

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

PDF

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

PDF

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

PDF

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

PDF

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