Role of bound states of magnetic layers in the theory of multilayer interaction

1996 ◽  
Vol 53 (1) ◽  
pp. 275-282 ◽  
Author(s):  
J. S. Helman ◽  
W. Baltensperger
Keyword(s):  
Bound States ◽  
Magnetic Layers

Role of Thermal Effects on Magnetic Interactions in Stacked Magnetic Layers With Perpendicular Anisotropy

2014 ◽  
Vol 5 ◽  
pp. 1-4
Author(s):  
S. N. Piramanayagam ◽  
Hang Khume Tan ◽  
Binni Varghese
Keyword(s):  
Thermal Effects ◽  
Magnetic Interactions ◽  
Perpendicular Anisotropy ◽  
Magnetic Layers

scholarly journals Dynamics of F/D networks: the role of bound states

2008 ◽  
Vol 2008 (08) ◽  
pp. 038 ◽  
Author(s):  
Mairi Sakellariadou ◽  
Horace Stoica
Keyword(s):  
Bound States

The role of α-synuclein in neurodegeneration — An update

2012 ◽  
Vol 3 (2) ◽  
Author(s):  
Kurt Jellinger
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Bound States ◽  
Physiological Function ◽  
Neuronal Degeneration ◽  
Association Studies ◽  
Common Mechanism ◽  
Genome Wide Association Studies ◽  
Potential Biomarker

AbstractGenetic, neuropathological and biochemical evidence implicates α-synuclein, a 140 amino acid presynaptic neuronal protein, in the pathogenesis of Parkinson’s disease and other neurodegenerative disorders. The aggregated protein inclusions mainly containing aberrant α-synuclein are widely accepted as morphological hallmarks of α-synucleinopathies, but their composition and location vary between disorders along with neuronal networks affected. α-Synuclein exists physiologically in both soluble and membran-bound states, in unstructured and α-helical conformations, respectively, while posttranslational modifications due to proteostatic deficits are involved in β-pleated aggregation resulting in formation of typical inclusions. The physiological function of α-synuclein and its role linked to neurodegeneration, however, are incompletely understood. Soluble oligomeric, not fully fibrillar α-synuclein is thought to be neurotoxic, main targets might be the synapse, axons and glia. The effects of aberrant α-synuclein include alterations of calcium homeostasis, mitochondrial dysfunction, oxidative and nitric injuries, cytoskeletal effects, and neuroinflammation. Proteasomal dysfunction might be a common mechanism in the pathogenesis of neuronal degeneration in α-synucleinopathies. However, how α-synuclein induces neurodegeneration remains elusive as its physiological function. Genome wide association studies demonstrated the important role for genetic variants of the SNCA gene encoding α-synuclein in the etiology of Parkinson’s disease, possibly through effects on oxidation, mitochondria, autophagy, and lysosomal function. The neuropathology of synucleinopathies and the role of α-synuclein as a potential biomarker are briefly summarized. Although animal models provided new insights into the pathogenesis of Parkinson disease and multiple system atrophy, most of them do not adequately reproduce the cardinal features of these disorders. Emerging evidence, in addition to synergistic interactions of α-synuclein with various pathogenic proteins, suggests that prionlike induction and seeding of α-synuclein could lead to the spread of the pathology and disease progression. Intervention in the early aggregation pathway, aberrant cellular effects, or secretion of α-synuclein might be targets for neuroprotection and disease-modifying therapy.

scholarly journals Fundamental dissipation due to bound fermions in the zero-temperature limit

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
S. Autti ◽  
S. L. Ahlstrom ◽  
R. P. Haley ◽  
A. Jennings ◽  
G. R. Pickett ◽  
...  
Keyword(s):  
Critical Velocity ◽  
Ground State ◽  
Bound States ◽  
Bound State ◽  
Temperature Limit ◽  
Pair Breaking ◽  
Zero Temperature ◽  
Andreev Bound States ◽  
Macroscopic Object

Abstract The ground state of a fermionic condensate is well protected against perturbations in the presence of an isotropic gap. Regions of gap suppression, surfaces and vortex cores which host Andreev-bound states, seemingly lift that strict protection. Here we show that in superfluid 3He the role of bound states is more subtle: when a macroscopic object moves in the superfluid at velocities exceeding the Landau critical velocity, little to no bulk pair breaking takes place, while the damping observed originates from the bound states covering the moving object. We identify two separate timescales that govern the bound state dynamics, one of them much longer than theoretically anticipated, and show that the bound states do not interact with bulk excitations.

scholarly journals ESR Study on the Excited State Energy Spectrum of SrCu2(BO3)2–A Central Role of Multiple-Triplet Bound States–

2003 ◽  
Vol 72 (12) ◽  
pp. 3243-3253 ◽  
Author(s):  
Hiroyuki Nojiri ◽  
Hiroshi Kageyama ◽  
Yutaka Ueda ◽  
Mitsuhiro Motokawa
Keyword(s):  
Excited State ◽  
Energy Spectrum ◽  
Bound States ◽  
State Energy ◽  
Excited State Energy

scholarly journals Spin-polarized transport across aLa0.7Sr0.3MnO3/YBa2Cu3O7−xinterface: Role of Andreev bound states

2001 ◽  
Vol 63 (21) ◽  
Author(s):  
Z. Y. Chen ◽  
Amlan Biswas ◽  
Igor Žutić ◽  
T. Wu ◽  
S. B. Ogale ◽  
...  
Keyword(s):  
Bound States ◽  
Andreev Bound States ◽  
Spin Polarized ◽  
Polarized Transport ◽  
Spin Polarized Transport

On the binding of electrons to CS2: Possible role of quadrupole-bound states

1996 ◽  
Vol 253 (1-2) ◽  
pp. 8-12 ◽  
Author(s):  
R.N. Compton ◽  
F.B. Dunning ◽  
P. Nordlander
Keyword(s):  
Bound States

Andreev conductance through a triangular-shaped quantum dot structure hosting Majorana bound states

2020 ◽  
Vol 34 (36) ◽  
pp. 2050424
Author(s):  
Muhammad Aslam ◽  
Xiao Feng Cheng ◽  
Long Liu ◽  
Yu-Xian Li
Keyword(s):  
Quantum Dots ◽  
Bound States ◽  
Majorana Fermion ◽  
Majorana Bound States ◽  
Conductance Spectrum ◽  
Highly Sensitive ◽  
Closed Systems ◽  
Interdot Coupling ◽  
Resonant Processes

The Andreev conductance in [Formula: see text]-shaped quantum dots (QDs) system coupled with Majorana bound states (MBSs) is studied and resulting conductance spectrum displays resonant and non-resonant processes. These fluctuated resonances render features like insulating band, bonding (antibonding) in the low-bias region due to non-trivial role of interdot coupling [Formula: see text] and dots-MBSs coupling [Formula: see text]. On comparing QD levels [Formula: see text], and the coupling between the MBSs, coherent oscillating dynamics of an electron between the nanowire and the QDs can be portrayed. The insulating band is robust against [Formula: see text], but highly sensitive to [Formula: see text], which causes to increase (decrease) the conductance. We can claim that under finite bias voltage, transport can facilitate the researchers to expose the essential features of the Majorana fermion in such closed systems composed of MBSs.

scholarly journals On the widths and binding energies of K− nuclear states and the role of K− multi-nucleon interactions

2018 ◽  
Vol 181 ◽  
pp. 01009
Author(s):  
Jaroslava Hrtankova ◽  
Jiří Mareš
Keyword(s):  
Bound States ◽  
Binding Energies ◽  
Many Body ◽  
Nucleon Interaction ◽  
Substantial Impact ◽  
Coupled Channels ◽  
Self Consistent ◽  
Interaction Term ◽  
Many Body Systems

We report on our recent self-consistent calculations of K− nuclear quasi-bound states using K− optical potentials derived from chirally motivated meson-baryon coupled channels models [1, 2]. The K− single-nucleon potentials were supplemented by a phenomenological K− multi-nucleon interaction term introduced to achieve good fits to K− atom data. We demonstrate a substantial impact of the K− multi-nucleon absorption on the widths of K− nuclear states. If such states ever exist in nuclear many-body systems, their widths are excessively large to allow observation.

Microstructure and Recording Noise of Thin Film Longitudinal Media

1991 ◽  
Vol 232 ◽  
Author(s):  
Tadashi Yogi ◽  
Thao A. Nguyena ◽  
Steven E. Lambert ◽  
Grace L. Gorman ◽  
Gil Castillo
Keyword(s):  
Thin Film ◽  
Film Growth ◽  
Magnetic Layer ◽  
Deposition Condition ◽  
Growth Morphology ◽  
Microstructural Characteristics ◽  
Magnetic Layers ◽  
The Media ◽  
Sputtering Pressure

ABSTRACTThe magnetic and recording characteristics of Co-based thin film media are strongly influenced by microstructure. The media microstructural characteristics, in turn, depend on sputtering conditions of underlayers and magnetic layers. The role of Cr underlayer thickness and sputtering pressure have been reported previously. The present work examines the growth morphology and recording properties of a CoPtCr alloy on Cr underlayers where the deposition conditions such as sputtering pressure and rf bias were independently varied for the Cr underlayer and the magnetic layer. We find that the growth morphology of the magnetic layer is governed primarily by the deposition condition of the Cr underlayer. In particular, increased sputtering pressure for the Cr underlayer produces columnar morphology which induces isolation of the grains in the magnetic layer. This results in a significant reduction in the recording noise due to reduced intergrain exchange coupling. On the other hand, the application of ff bias during the deposition of the magnetic layer promotes more continuous magnetic grains, thereby increasing the recording noise. The observed trends in microstructure and recording noise can be understood qualitatively in terms of Thornton's microstructure diagram and the competition between micromorphological roughness and adatom mobility during the film growth.

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