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Browsing Research and Publications - Department of Physics & Astronomy by Title

Now showing items 772-791 of 853

Tailoring Exchange Bias through Chemical Order in Epitaxial FePt₃ Films

Mankey, Gary (2013-07-01)

Intentional introduction of chemical disorder into mono-stoichiometric epitaxial FePt₃ films allows to create a ferro-/antiferromagnetic two-phase system, which shows a pronounced and controllable exchange bias effect. In ...
A Technique for Separating the Gravitational Torques of Bars and Spirals in Disk Galaxies

Buta, Ronald J.; Block, D. L.; Knapen, J. H. (American Astronomical Society, 2003-09)

We describe a Fourier-based method of separating bars from spirals in near-infrared images. The method takes advantage of the fact that a bar is typically a feature with a relatively fixed position angle and uses the simple ...
Temperature-dependent Magnetic Resonance Force Microscopy Studies of a Thin Permalloy Film

Nazaretski, E.; Thompson, J. D.; Movshovich, R.; Zalalutdinov, M.; Baldwin, J. W.; Houston, B.; Mewes, T.; Pelekhov, D. V.; Wigen, P.; Hammel, P. C.

We used magnetic resonance force microscopy (MRFM) to study a 50 nm thick continuous Permalloy film. We mechanically measured the ferromagnetic resonance signal in the temperature range between 10 and 70 K in the presence ...
Tensor to Scalar Ratio in Non-Minimal ϕ⁴ Inflation

Okada, Nobuchika (2010-08-04)

We reconsider nonminimal λϕ⁴ chaotic inflation which includes the gravitational coupling term ξRϕ², where ϕ denotes a gauge singlet inflaton field and R is the Ricci scalar. For ξ ≫ 1, we require, following recent discussions, ...
Testing Epitaxial Co1.5FeGe(001) Electrodes in MgO-based Magnetic Tunnel Junctions

Neggache, A.; Hauet, T.; Bertran, F.; Fèvre, P. Le; Petit-Watelot, S.; Devolder, T.; Ohresser, P.; Boulet, P.; Mewes, C.; Maat, S.; Childress, J. R.; Andrieu, S. (2014)

The ability of the full Heusler alloy Co1.5Fe1.5Ge(001) (CFG) to be a Half-Metallic Magnetic (HMM) material is investigated. Epitaxial CFG(001) layers were grown by molecular beam epitaxy. The results obtained using ...
Testing the 2-TeV Resonance with Trileptons

Okada, Nobuchika (2016-03-09)

The CMS collaboration has reported a 2.8σ excess in the search of the SU(2)_R gauge bosons decaying through right-handed neutrinos into the two electron plus two jets (eejj) final states. This can be explained if the SU(2)_R ...
Tev Gamma-Ray Observations of the Galactic Center Ridge by Veritas

Santander, Marcos (2016-04-22)

The Galactic Center ridge has been observed extensively in the past by both GeV and TeV gamma-ray instruments revealing a wealth of structure, including a diffuse component and the point sources G0.9+0.1 (a composite ...
TeV Scale Seesaw from Supersymmetric Higgs-Lepton Inflation and BICEP2

Okada, Nobuchika (Elsevier B.V., 2014-07-30)

We discuss the physics resulting from the supersymmetric Higgs-lepton inflation model and the recent CMB B-mode observation by the BICEP2 experiment. The tensor-to-scalar ratio r = 0.20^+0.07_-0.05 of the primordial ...
Texture Orientation of Glancing Angle Deposited Copper Nanowire Arrays

Mankey, Gary (2004-07-20)

Self-assembled copper nanowires were deposited on native oxide Si(100) substrates using glancing angle deposition with and without substrate rotation. Wire morphology, texture and crystallographic orientation are strongly ...
Theoretical Modeling of the Thermal State of Accreting White Dwarfs Undergoing Classical Nova Cycles

Townsley, Dean M.; Bildsten, Lars (2004-01-01)
Thermal Inflation with Flaton Chemical Potential

Okada, Nobuchika (2017-04-24)

Thermal inflation driven by a scalar field called a “flaton” is a possible scenario to solve the cosmological moduli problem. We study a model of thermal inflation with a flaton chemical potential. In the presence of the ...
Thermal Leptogenesis in Brane World Cosmology

Okada, Nobuchika (2006-03-10)

The thermal leptogenesis in brane world cosmology is studied. In brane world cosmology, the expansion law is modified from the four-dimensional standard cosmological one at high temperature regime in the early universe. ...
Thermal Stability of Synthetic Antiferromagnet and Hard Magnet Coupled Spin Valves

Tadisinia, Zeenath R.; Gupta, Subhadra; LeClair, Patrick; Mewes, Tim (2008)

The magnetic properties of current-in-plane (CIP) giant magnetoresistive (GMR) spin valves employing synthetic antiferromagnet (SAF) pinning have been investigated. The conventional spin valve structure, with a ferromagnetic ...
The Thermal State of the Accreting White Dwarf in AM Canum Venticorum Binaries

Bildsten, Lars; Townsley, Dean M.; Deloye, Christopher J.; Nelemans, Gus (2006-03-20)
The Thermal Structure and Evolution of Accreting White Dwarfs

Townsley, Dean M.; Bildsten, Lars (2007)

As mass is accreted on a White Dwarf (WD) in a mass-transferring binary, the inner layers are compressed and energy is released. The escape of this energy from the surface provides a floor to the WD surface temperature that ...
The Thick Disk in the Galaxy NGC 4244 from S^4G Imaging

Buta, Ronald J. (2011-02-07)

If thick disks are ubiquitous and a natural product of disk galaxy formation and/or evolution processes, all undisturbed galaxies that have evolved during a significant fraction of a Hubble time should have a thick disk. ...
Three-Dimensional Simulations of the Deflagration Phase of the Gravitationally Confined Detonation Model of Type Ia Supernovae

Jordan, G. C.; Fisher, R. T.; Calder, A. C.; Graziani, C.; Asida, S.; Lamb, Don Q.; Truran, J. W. (2008-07-10)

We report the results of a series of three-dimensional (3D) simulations of the deflagration phase of the gravitationally confined detonation mechanism for Type Ia supernovae. In this mechanism, ignition occurs at one or ...
Time-dependent Searches for Point Sources of Neutrinos with the 40-string and 22-string Configurations of IceCube

Santander, Marcos (2011-12-07)

This paper presents four searches for flaring sources of neutrinos using the IceCube neutrino telescope. For the first time, a search is performed over the entire parameter space of energy, direction, and time with sensitivity ...
Time-integrated Searches for Point-like Sources of Neutrinos with the 40-string IceCube Detector

Santander, Marcos (2011-04-08)

We present the results of time-integrated searches for astrophysical neutrino sources in both the northern and southern skies. Data were collected using the partially completed IceCube detector in the 40-string configuration ...
Top Quark Spin Correlations in the Randall-Sundrum Model at the CERN Large Hadron Collider

Okada, Nobuchika (American Physical Society, 2007-05-18)

In the Randall-Sundrum model, we study top-antitop pair production and top spin correlations at the Large Hadron Collider. In addition to the standard model processes, there is a new contribution to the top-antitop pair ...

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Browsing Research and Publications - Department of Physics & Astronomy by Title

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