By Roger D. Willett (auth.), Prof. Eugenio Coronado, Prof. Pierre Delhaès, Prof. Dante Gatteschi, Prof. Joel S. Miller (eds.)
Molecular Magnetism: From Molecular Assemblies to the Devices reports the cutting-edge within the region. it really is prepared in elements, the 1st of which introduces the elemental options, theories and actual strategies required for the research of the magnetic molecular fabrics, evaluating them with these utilized in the research of classical magnetic fabrics. the following the reader will locate: (i) a close dialogue of the digital strategies fascinated with the magnetic interplay mechanisms of molecular structures, together with electron delocalization and spin polarization results; (ii) a presentation of the to be had theoretical versions in response to spin and Hubbard Hamiltonians; and (iii) an outline of the explicit actual investigative innovations used to represent the fabrics.
the second one half offers the several sessions of present magnetic molecular fabrics, concentrating on the prospective artificial concepts built up to now to collect the molecular development blocks starting from simply natural to inorganic fabrics, in addition to on their actual homes and capability purposes. those fabrics contain inorganic and natural ferro- and ferrimagnets, excessive nuclearity natural molecules and magnetic and steel clusters, spin crossover platforms, cost move salts (including fulleride salts and natural conductors and superconductors), and arranged gentle media (magnetic liquid crystals and Langmuir-Blodgett films).
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Additional resources for Molecular Magnetism: From Molecular Assemblies to the Devices
Rather extensive discussions of the various M(T) curves can be found in references [Neel, 1948 #111; Gorter, 1955 #161; Smart, 1955 #160]. Ferrimagnetism offers the possibility of developing spontaneous magnetization in the presence of (extended) antiferromagnetic interactions. This is quite useful since ferromagnetic interactions are more difficult to stabilize than antiferromagnetic ones. The strategy was first suggested by Buchachenko in 1979 as a route to prepare organic magnets . It is therefore not surprising that chemists have made extensive use of such possibility to design magnetic molecular materials.
Above a critical temperature, often called the Neel temperature, thermal agitation destroys magnetic ordering and the material becomes a paramagnet that follows the Curie-Weiss law (Fig. 8b). t+ t ~ t + ~t~t+t t ~ t~ t~ a) liX ,~ ~' ,' , ,,,, AF a # i : I I I I I PM TN T b) Figure 8. Magnetic characteristics of an ideal antiferromagnet: a) spontaneous alignment of the moments; b) linear temperature dependence of the reciprocal susceptibility. In the simplest case an antiferromagnet can be regarded as two identical interpenetrating ferromagnetic sublattices, say A and B, which respective magnetization possess identical magnitude but opposite direction.
To study the spontaneous magnetization it is better to set the applied field H equal to zero. The variation of the sublattice magnetizations with temperature depends on the ratios NASA/NBSB, 'YAAI 'Y AB and 'YBBI y AB· The magnitude of the resultant spontaneous magnetization is then found from the equation I M(T) = MA(T) - M8 (T) I (91) Although quite often the form of the M versus T curve is reminiscent of the standard magnetization curve of a ferromagnet (see Fig. 11 c)), some unusually shaped curves are also possible (see Fig.