Role of the Electron Transfer and Magnetic Exchange Interactions in the Magnetic Properties of Mixed-Valence Polyoxovanadate Complexes

2008 ◽  
Vol 47 (13) ◽  
pp. 5889-5901 ◽  
Author(s):  
Carmen J. Calzado ◽  
Juan M. Clemente-Juan ◽  
Eugenio Coronado ◽  
Alejandro Gaita-Arino ◽  
Nicolas Suaud
Keyword(s):  
Electron Transfer ◽  
Magnetic Properties ◽  
Mixed Valence ◽  
Exchange Interactions ◽  
Magnetic Exchange

Electron transfer in tetranuclear mixed-valence iron clusters. Role of the topology on the magnetic properties

1992 ◽  
Vol 166 (1-2) ◽  
pp. 139-144 ◽  
Author(s):  
J.J. Borras-Almenar ◽  
E. Coronado ◽  
R. Georges ◽  
C.J. Gomez-Garcia
Keyword(s):  
Electron Transfer ◽  
Magnetic Properties ◽  
Mixed Valence ◽  
Iron Clusters

Ab-initio modeling of Fe-Mn based alloys and nanoclusters

2011 ◽  
Vol 1296 ◽  
Author(s):  
Peter Entel ◽  
Denis Comtesse ◽  
Heike C. Herper ◽  
Markus E. Gruner ◽  
Mario Siewert ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Ab Initio ◽  
Finite Temperature ◽  
Large Scale ◽  
Exchange Interactions ◽  
The Novel ◽  
Magnetic Exchange ◽  
Simulation Tools ◽  
Transition Metal Alloys ◽  
Structural And Magnetic Properties

ABSTRACTNew methods in steel design and basic understanding of the novel materials require large scale ab initio calculations of ground state and finite temperature properties of transition metal alloys. In this contribution we present ab initio modeling of the structural and magnetic properties of XYZ compounds and alloys where X, Y = Mn, Fe, Co Ni and Z = C, Si with emphasis on the Fe-Mn steels. The optimization of structural and magnetic properties is performed by using different simulation tools. In particular, the finite-temperature magnetic properties are simulated using a Heisenberg model with magnetic exchange interactions from first-principles calculations. Part of the calculations are extended to the nanoparticle range showing how ferromagnetic and antiferromagnetic trends influence the nucleation, morphologies and growth of Fe-Mn-based nanoparticles.

Elaboration of Single Crystalline AU/NI80FE20/CU/NI80FE20/NIO(111) Spin Valves

2000 ◽  
Vol 619 ◽  
Author(s):  
C. Mocuta ◽  
A. Barbier ◽  
S. Lafaye ◽  
P. Bayle-Guillemaud
Keyword(s):  
Magnetic Properties ◽  
Giant Magnetoresistance ◽  
Magnetic Layer ◽  
Growth Conditions ◽  
Spin Valves ◽  
High Coercivity ◽  
Magnetic Exchange ◽  
Transmission Electron ◽  
Magnetic Exchange Coupling

ABSTRACTThe successful preparation of fully epitaxial spin-valves elaborated on NiO(111) single crystals is reported. The growth conditions of a smooth 2D permalloy (Py = Ni80Fe20) layer have been determined. A very strong magnetic exchange interaction is evidenced on the Py/NiO(111) interface. It strongly modifies the magnetic properties of Py that acquires high coercivity, leaving it as a hard magnetic material. The second Py layer has unchanged magnetic properties and plays the role of the sensing soft magnetic layer. A giant magnetoresistance (GMR) of 3.5% at room temperature was easily obtained without optimizing the thickness of the different layers. Complementarily energy-filtered (EF-) and high-resolution (HR-) transmission electron microscopy (TEM) were used to fully characterize the spin valves. Within the framework of magnetic exchange coupling, our results open the possibility to elaborate model spin valves in which the role of each interface can be investigated and controlled at the atomic level. The detrimental effect of an inter-diffusion at the Py/NiO interface is evidenced.

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