Three-dimensional exchange bias in{Co/Pd}N/FeMn

2003 ◽  
Vol 68 (1) ◽  
Author(s):  
C. H. Marrows
Keyword(s):  
Exchange Bias ◽  
Three Dimensional

Monte Carlo Simulations of the Exchange Bias Effect in Heusler Ni50Mn37.5Sb12.5 Alloys Using Real Unit Cell

2011 ◽  
Vol 1310 ◽  
Author(s):  
Vasiliy D. Buchelnikov ◽  
Ivan A. Taranenko ◽  
Vladimir V. Sokolovskiy ◽  
Sergey V. Taskaev ◽  
Mikhail A. Zagrebin ◽  
...  
Keyword(s):  
Exchange Bias ◽  
Periodic Boundary ◽  
Three Dimensional ◽  
Periodic Boundary Conditions ◽  
Bias Field ◽  
Magnetic Interactions ◽  
Bias Effect ◽  
Exchange Bias Effect ◽  
Cubic Lattice ◽  
Coordination Spheres

ABSTRACTIn present work we propose a theoretical model for investigation of the exchange bias effect in Ni50Mn37.5Sb12.5 alloy. In the model, we use a three-dimensional cubic lattice with periodic boundary conditions. Also we take into account the magnetic interactions between atoms in 1st, 2nd and 3rd coordination spheres and the ferromagnetic and antiferromagnetic anisotropy terms. It is shown that the obtained theoretical temperature dependence of the exchange bias field for Ni50Mn37.5Sb12.5 alloy is close to the experimental data.

A simulation approach for the finite-temperature magnetic properties, stochastic dynamics and heating properties of magnetic nanoparticles composed of FM core/AFM shell

2019 ◽  
Vol 33 (23) ◽  
pp. 1950269
Author(s):  
Yusuf Yüksel
Keyword(s):  
Exchange Bias ◽  
Shell Thickness ◽  
Stochastic Dynamics ◽  
Three Dimensional ◽  
Simulation Method ◽  
Bias Effect ◽  
Exchange Bias Effect ◽  
Loop Area ◽  
Wide Range ◽  
Hysteresis Loop Area

Using the Monte Carlo simulation method based on the Metropolis algorithm, we present some results regarding the magnetic and heating properties of three-dimensional nanoparticles composed of a ferromagnetic core surrounded by an antiferromagnetic shell. We investigate the variation of the exchange bias effect and its dependence on the particle shell thickness, as well as on the temperature. In terms of the stochastic dynamics, we applied a time-dependent alternating magnetic field on the system, and calculated the dynamic-order parameters, response functions and the hysteresis loop area from the AC hysteresis curves from which we have also quantified the specific absorption rate (SAR) of the particle over a wide range of field frequencies. A number of interesting results have been found regarding the variation of the heating properties of the system as a function of the antiferromagnetic shell thickness and the period of the alternating field.

scholarly journals Three-dimensional magnetization profile and multiaxes exchange bias in Co antidot arrays

2010 ◽  
Vol 97 (19) ◽  
pp. 192502 ◽  
Author(s):  
F. Fettar ◽  
L. Cagnon ◽  
N. Rougemaille
Keyword(s):  
Exchange Bias ◽  
Three Dimensional ◽  
Antidot Arrays

Exchange bias in large three dimensional iron oxide nanocomposites

2010 ◽  
Vol 96 (1) ◽  
pp. 013102 ◽  
Author(s):  
J. R. Morales ◽  
S. Tanju ◽  
W. P. Beyermann ◽  
J. E. Garay
Keyword(s):  
Iron Oxide ◽  
Exchange Bias ◽  
Three Dimensional

The effect of a cooling field on exchange bias in a nanoparticle system

2008 ◽  
Vol 222 (1) ◽  
pp. 17-22
Author(s):  
Y Hu ◽  
Y Liu ◽  
A Du
Keyword(s):  
Exchange Bias ◽  
Three Dimensional ◽  
Granular System ◽  
Absolute Value ◽  
The Past ◽  
Metropolis Method ◽  
Core Matrix ◽  
Nanoparticle System ◽  
Ultrahigh Density ◽  
Sufficient Strength

Interest in exchange bias in magnetic nanoparticles has increased in the past few years by virtue of its potential for applications in fields such as ultrahigh-density magnetic recording. A modified Monte Carlo Metropolis method is employed to simulate the effect of cooling field on exchange bias and coercivity of a granular system of ferromagnetic nanoparticles embedded in an antiferromagnetic matrix, based on the classical three-dimensional Heisenberg model. The results show that the exchange bias is constantly negative, and that its absolute value decreases to a metastable value initially, while the coercivity increases monotonically with increase in the cooling field, and they both level off as the cooling field gains sufficient strength. The phenomena can be attributed to the energy barriers arising from the high antiferromagnetic anisotropy and the frustrated core—matrix structure. However, the interfacial coupling may change the configuration of the antiferromagnetic matrix to influence the exchange bias.

The orbit of Pluto over a long interval of time

1966 ◽  
Vol 25 ◽  
pp. 227-229 ◽  
Author(s):  
D. Brouwer
Keyword(s):  
Periodic Orbit ◽  
Numerical Integration ◽  
Restricted Problem ◽  
Three Dimensional ◽  
The Third ◽  
Circular Restricted Problem ◽  
Resonance Relation

The paper presents a summary of the results obtained by C. J. Cohen and E. C. Hubbard, who established by numerical integration that a resonance relation exists between the orbits of Neptune and Pluto. The problem may be explored further by approximating the motion of Pluto by that of a particle with negligible mass in the three-dimensional (circular) restricted problem. The mass of Pluto and the eccentricity of Neptune's orbit are ignored in this approximation. Significant features of the problem appear to be the presence of two critical arguments and the possibility that the orbit may be related to a periodic orbit of the third kind.

Conformation of Ribosomes from Escherichia Coli

1974 ◽  
Vol 32 ◽  
pp. 210-211
Author(s):  
M. Boublik ◽  
W. Hellmann ◽  
F. Jenkins
Keyword(s):  
Binding Sites ◽  
Ribosomal Proteins ◽  
Fluorescent Dyes ◽  
Protein Biosynthesis ◽  
Three Dimensional ◽  
Spatial Arrangement ◽  
Dimensional Structure ◽  
Complete Understanding ◽  
And Function

The present knowledge of the three-dimensional structure of ribosomes is far too limited to enable a complete understanding of the various roles which ribosomes play in protein biosynthesis. The spatial arrangement of proteins and ribonuclec acids in ribosomes can be analysed in many ways. Determination of binding sites for individual proteins on ribonuclec acid and locations of the mutual positions of proteins on the ribosome using labeling with fluorescent dyes, cross-linking reagents, neutron-diffraction or antibodies against ribosomal proteins seem to be most successful approaches. Structure and function of ribosomes can be correlated be depleting the complete ribosomes of some proteins to the functionally inactive core and by subsequent partial reconstitution in order to regain active ribosomal particles.

Ultrastructural Investigations of the Contractile Filaments of Amoebae

1974 ◽  
Vol 32 ◽  
pp. 188-189
Author(s):  
P.L. Moore
Keyword(s):  
Cytoplasmic Streaming ◽  
Three Dimensional ◽  
Freeze Fracture ◽  
Amoeboid Movement ◽  
Different Types ◽  
Chemical Conditions ◽  
Complete Interpretation

Previous freeze fracture results on the intact giant, amoeba Chaos carolinensis indicated the presence of a fibrillar arrangement of filaments within the cytoplasm. A complete interpretation of the three dimensional ultrastructure of these structures, and their possible role in amoeboid movement was not possible, since comparable results could not be obtained with conventional fixation of intact amoebae. Progress in interpreting the freeze fracture images of amoebae required a more thorough understanding of the different types of filaments present in amoebae, and of the ways in which they could be organized while remaining functional.The recent development of a calcium sensitive, demembranated, amoeboid model of Chaos carolinensis has made it possible to achieve a better understanding of such functional arrangements of amoeboid filaments. In these models the motility of demembranated cytoplasm can be controlled in vitro, and the chemical conditions necessary for contractility, and cytoplasmic streaming can be investigated. It is clear from these studies that “fibrils” exist in amoeboid models, and that they are capable of contracting along their length under conditions similar to those which cause contraction in vertebrate muscles.

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