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Search Results: 1 - 10 of 449835 matches for " C. J. Kinane "
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Magnetic hysteresis of an artificial square ice studied by in-plane Bragg x-ray resonant magnetic scattering
J. P. Morgan,C. J. Kinane,T. R. Charlton,A. Stein
AIP Advances , 2012, DOI: 10.1063/1.4732147
Abstract: We report X-ray resonant magnetic scattering studies of a Permalloy artificial square ice nanomagnet array, focussing on the field-driven evolution of the sum Σ and difference Δ signals of left and right handed circularly polarized synchrotron X-rays at different lateral positions in reciprocal space Qx. We used X-rays tuned to the Fe L3 resonance energy, with the scattering plane aligned along a principal symmetry axis of the array. Details of the specular Δ hysteresis curve are discussed, following the system magnetization from an initial demagnetized state. The periodic structure gives rise to distinct peaks at in-plane reciprocal Bragg positions, as shown by fitting Σ(Qx) to a model based on a simple unit cell structure. Diffraction order-dependent hysteresis in Δ is observed, indicative of the reordering of magnetization on the system's two interpenetrating sublattices, which markedly deviates from an ideal Ising picture under strong applied fields.
Manipulation of the spin helix in FeGe thin films and FeGe/Fe multilayers
Nicholas A. Porter,Charles S. Spencer,Rowan C. Temple,Christian J. Kinane,Timothy R. Charlton,Sean Langridge,Christopher H. Marrows
Physics , 2015, DOI: 10.1103/PhysRevB.92.144402
Abstract: Magnetic materials without structural inversion symmetry can display the Dzyaloshinskii-Moriya interaction, which manifests itself as chiral magnetic ground states. These chiral states can interact in complex ways with applied fields and boundary conditions provided by finite sample sizes that are of the order of the lengthscale of the chiral states. Here we study epitaxial thin films of FeGe with a thickness close to the helix pitch of the helimagnetic ground state, which is about 70 nm, by conventional magnetometry and polarized neutron reflectometry. We show that the helix in an FeGe film reverses under the application of a field by deforming into a helicoidal form, with twists in the helicoid being forced out of the film surfaces on the way to saturation. An additional boundary condition was imposed by exchange coupling a ferromagnetic Fe layer to one of the interfaces of an FeGe layer. This forces the FeGe spins at the interface to point in the same direction as the Fe, preventing node expulsion and giving a handle by which the reversal of the helical magnet may be controlled.
Controlled suppression of superconductivity by the generation of polarized Cooper pairs in spin valve structures
M. G. Flokstra,T. C. Cunningham,J. Kim,N. Satchell,G. Burnell,S. J. Bending,P. J. Curran,S. J. Langridge,C. Kinane,J. F. K. Cooper,N. Pugach,M. Eschrig,S. L. Lee
Physics , 2014, DOI: 10.1103/PhysRevB.91.060501
Abstract: Transport measurements are presented on thin-film superconducting spin-valve systems, where the controlled non-collinear arrangement of two ferromagnetic Co layers can be used to influence the superconducting state of Nb. We observe a very clear oscillation of the superconducting transition temperature with the relative orientation of the two ferromagnetic layers. Our measurements allow us to distinguish between the competing influences of domain averaging, stray dipolar fields and the formation of superconducting spin triplets. Domain averaging is shown to lead to a weak enhancement of transition temperature for the anti-parallel configuration of exchange fields, while much larger changes are observed for other configurations, which can be attributed to drainage currents due to spin triplet formation.
Remotely induced magnetism in a normal metal using a superconducting spin-valve
M. G. Flokstra,N. Satchell,J. Kim,G. Burnell,P. J. Curran,S. J. Bending,J. F. K. Cooper,C. J. Kinane,S. Langridge,A. Isidori,N. Pugach,M. Eschrig,H. Luetkens,A. Suter,T. Prokscha,S. L. Lee
Physics , 2015,
Abstract: Superconducting spintronics has emerged in the last decade as a promising new field that seeks to open a new dimension for nanoelectronics by utilizing the internal spin structure of the superconducting Cooper pair as a new degree of freedom. Its basic building blocks are spin-triplet Cooper pairs with equally aligned spins, which are promoted by proximity of a conventional superconductor to a ferromagnetic material with inhomogeneous macroscopic magnetization. Using low-energy muon spin rotation experiments, we find an entirely unexpected novel effect: the appearance of a magnetization in a thin layer of a non-magnetic metal (gold), separated from a ferromagnetic double layer by a 50 nm thick superconducting layer of Nb. The effect can be controlled by either temperature or by using a magnetic field to control the state of the remote ferromagnetic elements and may act as a basic building block for a new generation of quantum interference devices based on the spin of a Cooper pair.
Observation of a temperature dependent asymmetry in the domain structure of a Pd doped FeRh epilayer
C. J. Kinane,M. Loving,M. A. de Vries,R. Fan,T. R. Charlton,J. S. Claydon,D. A. Arena,F. Maccherozzi,S. S. Dhesi,D. Heiman,C. H. Marrows,L. H. Lewis,Sean Langridge
Physics , 2014, DOI: 10.1088/1367-2630/16/11/113073
Abstract: Using X-ray photoelectron emission microscopy we have observed the coexistence of ferromagnetic and antiferromagnetic phases in a (3 at.%)Pd-doped FeRh epilayer. By quantitatively analyzing the resultant images we observe that as the epilayer transforms there is a change in magnetic domain symmetry from predominantly twofold at lower temperatures through to an equally weighted combination of both four and twofold symmetries at higher temperature. It is postulated that the lowered symmetry Ising-like nematic phase resides at the near-surface of the epilayer. This behavior is different to that of undoped FeRh suggesting that the variation in symmetry is driven by the competing structural and electronic interactions in the nanoscale FeRh film coupled with the effect of the chemical doping disorder.
Temperature controlled motion of an antiferromagnet-ferromagnet interface within a dopant-graded FeRh epilayer
C. Le Gra?t,T. R. Charlton,M. McLaren,M. Loving,S. A. Morley,C. J. Kinane,R. M. D. Brydson,L. H. Lewis,S. Langridge,C. H. Marrows
Physics , 2014,
Abstract: Chemically ordered B2 FeRh exhibits a remarkable antiferromagnetic-ferromagnetic phase transition that is first order. It thus shows phase coexistence, usually by proceeding though nucleation at random defect sites followed by propagation of phase boundary domain walls. The transition occurs at a temperature that can be varied by doping other metals onto the Rh site. We have taken advantage of this to yield control over the transition process by preparing an epilayer with oppositely directed doping gradients of Pd and Ir throughout its height, yielding a gradual transition that occurs between 350~K and 500~K. As the sample is heated, a horizontal antiferromagnetic-ferromagnetic phase boundary domain wall moves gradually up through the layer, its position controlled by the temperature. This mobile magnetic domain wall affects the magnetisation and resistivity of the layer in a way that can be controlled, and hence exploited, for novel device applications.
Thickness-dependent magnetic properties of oxygen-deficient EuO
M. Barbagallo,T. Stollenwerk,J. Kroha,N. -J. Steinke,N. D. M. Hine,J. F. K. Cooper,C. H. W. Barnes,A. Ionescu,P. M. D. S. Monteiro,J. -Y. Kim,K. R. A. Ziebeck,C. J. Kinane,R. M. Dalgliesh,T. R. Charlton,S. Langridge
Physics , 2011, DOI: 10.1103/PhysRevB.84.075219
Abstract: We have studied how the magnetic properties of oxygen-deficient EuO sputtered thin films vary as a function of thickness. The magnetic moment, measured by polarized neutron reflectometry, and the Curie temperature are found to decrease with reducing thickness. Our results indicate that the reduced number of nearest neighbors, band bending and the partial depopulation of the electronic states that carry the spins associated with the 4f orbitals of Eu are all contributing factors in the surface-induced change of the magnetic properties of EuO$_{1-x}$.
Sphingosine Kinase-1 Is Required for Toll Mediated β-Defensin 2 Induction in Human Oral Keratinocytes
Manjunatha R. Benakanakere,Jiawei Zhao,Johnah C. Galicia,Michael Martin,Denis F. Kinane
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0011512
Abstract: Host defense against invading pathogens is triggered by various receptors including toll-like receptors (TLRs). Activation of TLRs is a pivotal step in the initiation of innate, inflammatory, and antimicrobial defense mechanisms. Human β-defensin 2 (HBD-2) is a cationic antimicrobial peptide secreted upon Gram-negative bacterial perturbation in many cells. Stimulation of various TLRs has been shown to induce HBD-2 in oral keratinocytes, yet the underlying cellular mechanisms of this induction are poorly understood.
Letter of Welcome
Denis F Kinane
Tobacco Induced Diseases , 2004, DOI: 10.1186/1617-9625-2-4-167
Abstract: Dear Conference Delegates,It is with great pleasure that I offer a warm Louisville welcome to all delegates of the 2004 Annual Scientific Meeting of the International Society for the Prevention of Tobacco Induced Diseases.Smoking kills 5 million people each year, an annual death toll that is expected soon to reach 10 million. Therefore, it is difficult to overestimate the importance of this global health concern. It is my sincere hope that the combined body of expertise assembling for this conference will contribute to reducing the tobacco-induced disease burden by disseminating the latest research findings, forming research collaborations, and assembling multidisciplinary alliances.As you are aware Kentucky represents the heart of tobacco country and we have many lessons still to learn in the area of tobacco control. Thus, it is anticipated that the Louisville conference may help to promote tobacco control in our own region and, thus, have a long-lasting beneficial effect on our population.During your visit, I do hope that you will find the time to relax and enjoy the wide range of activities that Louisville, and the surrounding countryside, has to offer.Thank you for attending this important scientific conference, and again, welcome to Louisville.Denis F. Kinane, BDS, PhD, FDS RCPS, FDS RCSDelta Dental Endowed ProfessorAssociate Dean for Research and EnterpriseContinuing Health Sciences EducationTo the "Third Annual Conference of the International Society of Tobacco Induced Diseases" (ISPTID) HOW TOBACCO KILLSAccreditation StatementThe University of Louisville School of Medicine is accredited by the Accreditation Council for Continuing Medical Education to provide continuing medical education for physicians.Category 1 CreditPhysicians wishing to receive Category 1 credit must complete and turn in the evaluation and registration for credit forms at the conclusion of the program. Please make sure your name, address, the last 4 digits of your Social Security number a
The true cost of tobacco usage in the USA
Kinane Denis,Williams John
Tobacco Induced Diseases , 2005, DOI: 10.1186/1617-9625-3-44
Abstract:
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