Exchange-coupled magnets

Nanocomposites or mesoscopic materials are of interest in many fields of materials science, solid-state physics and solid-state chemistry. This is also true in the research of magnets much effort has been spent on these kind of materials. The most recent development is that of exchange-coupled magnets, in which hard and soft magnetic fine... 

An idealized schematic representation of exchange-coupled magnets is shown in fig. 22. 

Since 1987 many exchange-coupled rare-earth-transition-metal magnets have been developed. Examples of exchange-coupled magnets are listed in table 2. 

Lee J-H, Jang J-T, Choi J-S, Moon S-H, Noh S-H, Kim J-W, Kim J-G, Kim I-S, Park K-I, Cheon J (2011) Exchange-coupled magnetic nanoparticles for efficient heat induction. Nat Nanotechnol 6 418... 

We consider a R-T compound. Let Mr be the magnetic 4f-moment (per mol fu.) of the R atoms and Mj that of the (itinerant) d electrons (including all of the 3d and 5d electrons). For this system of exchange-coupled magnetic moments, placed in an external magnetic field Bq, the linearized equilibrium conditions can be written in the molecular field approximation as... 

Ab initio DDCI2 (difference-dedicated configuration interaction) calculations seem to provide accurate estimations of the magnetic exchange coupling constants, as demonstrated for the doubly azido-bridged nickel(II) dimer [Ni2(terpy)2(/i-l,l-N3)2]2+.2133... 

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