Ferromagnets, dielectric compounds

If we can combine ferroelectrically polarizable guest molecules with PCPMs, then we can obtain new types of multiferroic materials, where ferroelectricity and ferromagnetism coexist. Such multifunctional materials have recently aroused increasing interest from the viewpoint of the development of new materials with very large magnetoelectric effects. [Mn3(HCOO)6] EtOH is considered to be the first ferroelectric PCP.182 Because the desolvated compound [Mn3(HCOO)6] shows a very small and almost temperature-independent dielectric constant, irrespective of the direction of the electric field,183 the observed ferroelectric property is considered to come mainly from the guest EtOH molecules. 

Quantitative information about dimer vibration and e-p interaction can be elucidated by matching predictions to the measured shape and size dependence of Raman and photoemission/absorption spectra of Si and other III-V and II-VI compounds. The CN imperfection of different orders unifies the phase stability of ferromagnetic, ferroelectric, and superconductive nanosolids. In conjunction with the previous bond-band-barrier correlation mechanism, the present approach allows us to distinguish the extent of oxidation and contribution of surface passivation to the dielectric susceptibility of porous silicon [16]. 

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