Materials Literature
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Unit-vector fields $\nvec$ on a convex polyhedron $P$ subject to tangent boundary conditions provide a simple model of nematic liquid crystals in prototype bistable displays. The equilibrium and metastable configurations correspond to minimisers and local minimisers of the Dirichlet energy, and may be regarded as $S^2…
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International audience
Electric power as a commodity is very different from other products – it is generated far from the point of use, is fed to the grid together with the output of many other generators and arrives at the point of use via several transformers and many kilometers of overhead and possibly underground cabling. Quality check…
Im Zuge des Miniaturisierungstrends elektronischer Bauelemente sind höhere Arbeitsfrequenzen gefordert, wobei die Bauteile das gleiche Niveau der Energieübertragung besitzen sollen. Um diesen Anforderungen gerecht zu werden, werden neue Mangan-Zink-Ferritmaterialien mit geringer Verlustleistung bei hohen Arbeitsfreque…
Neutrons and x-rays are coherent probes, and their coherent properties are used in scattering experiments. Only coherent scattering probes can elucidate collective molecular motions. While phonons in crystals were studied for half a century now, the study of collective molecular motions in soft-matter and biology is a…
In this paper, the authors review the magnetocaloric properties of Ni-Mn-based Heusler alloys in the vicinity of their martensitic transition and its relation to their magnetic shape-memory and superelastic behaviour. They show that this striking magnetomechanical behaviour is possible thanks to the existence of a str…
A study of the magnetostructural transition and magnetocaloric effect in Ni-Mn-In-(Co) bulk and ribbon samples was carried out. A significant shift of martensitic transition temperature by the application of the magnetic field occurs below room temperature in Ni(50)Mn(34)In(16) bulk sample. The positive and negative m…
The magnetic field source system constitutes an important component of magnetic refrigeration device. In this paper the authors present the results of calculation and designing the effective magnetic system up to 1.9 T. All numerical calculations of the design of the magnetic system are validated by using to two-dimen…
Astronautics has developed a new computational method for solving the equations that govern the temperature profile in an active magnetic regenerator (AMR) with a layered bed. The method is extremely fast and can be used to perform large-scale parametric studies of AMR performance. The method can also be combined with…
The magnetic and magnetocaloric properties of three different solid solutions: Mn(3-x)Co(x)Sn(2), Mn(3)Sn(2-x)Ge(x) and Mn(3-x)Fe(x)Sn(1.9)In(0.1) being derivative from the Mn(3)Sn(2) compound are briefly investigated.
In the last decade magnetic refrigeration principle based on the magnetocaloric effect (MCE) attracted much attention and was a subject of intense studies. Nowadays an increasing interest is given to the LaFe(13-x)Si(x) series of compounds, especially due to potentially high MC properties and low cost. To increase the…
The phase formation, structure, and magnetocaloric effect in as-cast and annealed LaFe(11.5)Si(1.5)B(x) (x= 0, 0.2, 0.5 and 1.0) compounds have been studied. Rietveld analyses of the x-ray powder diffraction patterns indicate that the cubic NaZn(13)-type La(Fe, Si)13 (1:13) phase is the main phase in the as-cast LaFe(…
A magnetic material is a thermodynamic system described by at least three degrees of freedom, comprising the pairs of variables T-S, p-V and M-H. Magnetic first order transitions must obey the Gibbs phase rule, meaning that one phase fields in the phase diagrams must be separated by two phase fields. This means that t…
Advantage of the itinerant electron metamagnetic transition in La[Fe(x)Si(1-x)]13 for magnetic refrigerants is discussed in terms of the control of the phase transition related with the latent heat and hysteresis loss and the results are contrasted with that of other candidates possessing the localized magnetic moment.
Universal scaling dependence of the magnetic entropy change versus temperature discovered earlier for magnetic materials with the second order transition is applied for the adiabatic temperature change versus temperature dependences.
The authors report their studies on two prototype first order magnetocaloric material systems Gd(5)Ge(4) and CoMnSi using a novel suite of characterisation tools to illustrate how key information is obtained concerning the nature of the magnetic transition when probed at global macroscopic length scales and spatially…
The hysteretic behaviour of some first-order magnetic phase transition materials with large magnetocaloric effect has been investigated by means of magnetic measurements. An unusual phase transition, so called 'virgin' effect, exists in some Mn-based compounds, but not in the Gd(5)[Si,Ge]4 and La(Fe,Si)13 compounds. I…
The iron pnictides and the cuprates represent two families of materials, where strong antiferromagnetic correlation drives three other distinct ordering tendencies: (1) superconducting pairing, (2) Fermi surface distortion, and (3) orbital current order. We propose that (1)-(3) and the antiferromagnetic correlation ar…
We study the light scattering by a hedgehog-like and linear disclination topological defects in a nematic liquid crystal. Propagating near such defects, the light feels an effective metric equivalent to the spatial part of the global monopole and cosmic string geometries. We obtain the diffraction pattern in terms of…