Equipment for the magnetization characteristic evaluation of a ferromagnetic body

2015 ◽  
Author(s):  
Mihai Maricaru ◽  
Stelian Marinescu ◽  
Marilena Stanculescu ◽  
Paul Cristian Andrei ◽  
Florea I. Hantila
Keyword(s):  
Ferromagnetic Body

scholarly journals Homogenization of composite ferromagnetic materials

2015 ◽  
Vol 471 (2182) ◽  
pp. 20150365 ◽  
Author(s):  
François Alouges ◽  
Giovanni Di Fratta
Keyword(s):  
Free Energy ◽  
Ferromagnetic Material ◽  
Energy Functional ◽  
Ferromagnetic Materials ◽  
Rigorous Derivation ◽  
Free Energy Functional ◽  
Landau Free Energy ◽  
Ferromagnetic Body ◽  
The Media

The objective of this paper is to perform, by means of Γ - convergence and two-scale convergence , a rigorous derivation of the homogenized Gibbs–Landau free energy functional associated with a composite periodic ferromagnetic material, i.e. a ferromagnetic material in which the heterogeneities are periodically distributed inside the media. We thus describe the Γ -limit of the Gibbs–Landau free energy functional, as the period over which the heterogeneities are distributed inside the ferromagnetic body shrinks to zero.

scholarly journals Hydrogen Trapping in bcc Iron

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2288 ◽  
Author(s):  
Anastasiia S. Kholtobina ◽  
Reinhard Pippan ◽  
Lorenz Romaner ◽  
Daniel Scheiber ◽  
Werner Ecker ◽  
...  
Keyword(s):  
Density Functional ◽  
Atomic Level ◽  
Body Centered Cubic ◽  
Hydrogen Trapping ◽  
Functional Theory ◽  
Bcc Iron ◽  
Ferromagnetic Body ◽  
Fundamental Understanding ◽  
Crystal Lattice Defects ◽  
Trapping Sites

Fundamental understanding of H localization in steel is an important step towards theoretical descriptions of hydrogen embrittlement mechanisms at the atomic level. In this paper, we investigate the interaction between atomic H and defects in ferromagnetic body-centered cubic (bcc) iron using density functional theory (DFT) calculations. Hydrogen trapping profiles in the bulk lattice, at vacancies, dislocations and grain boundaries (GBs) are calculated and used to evaluate the concentrations of H at these defects as a function of temperature. The results on H-trapping at GBs enable further investigating H-enhanced decohesion at GBs in Fe. A hierarchy map of trapping energies associated with the most common crystal lattice defects is presented and the most attractive H-trapping sites are identified.

On Ising's model of ferromagnetism

1936 ◽  
Vol 32 (3) ◽  
pp. 477-481 ◽  
Author(s):  
R. Peierls
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Interaction Energy ◽  
Opposite Direction ◽  
Regular Lattice ◽  
Additional Energy ◽  
Negative Direction ◽  
Ferromagnetic Body

Ising discussed the following model of a ferromagnetic body: Assume N elementary magnets of moment μ to be arranged in a regular lattice; each of them is supposed to have only two possible orientations, which we call positive and negative. Assume further that there is an interaction energy U for each pair of neighbouring magnets of opposite direction. Further, there is an external magnetic field of magnitude H such as to produce an additional energy of − μH (+ μH) for each magnet with positive (negative) direction.

scholarly journals On a model for electromagnetic processes inside and outside a ferromagnetic body

2008 ◽  
Vol 31 (13) ◽  
pp. 1545-1567
Author(s):  
Martin Brokate ◽  
Michela Eleuteri ◽  
Pavel Krejčí
Keyword(s):  
Electromagnetic Processes ◽  
Ferromagnetic Body
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