Ferro-/ferrimagnetism

In the above examples, a transition-metal atom is invariably present. As such, one might believe that the unpaired d electrons of the transition metal are the main cause of ferro/ferrimagnetic ordering, the organic/molecular species only playing a secondary role. There are a few examples of molecular magnets without the transition-metal atoms, albeit showing low T s. These are p-nitrophenyl nitronyl nitroxide (T = 0.6 K)... 

Values obtained by powder neutron diffraction for the ferrimagnetic phase [the number of magnetic atoms (g — lgB) and non-magnetic atom is the same, see fig. 3.6. and text]. h The lower transition from antiferromagnetism to ferro/ferrimagnetism. 

Figure 18.23 Mechanically coupled magnetoelectric composites, (a) Crain mixture (b) Thin-film heterostructure (from Ref [123]) (c) Sandwich structure (from Ref [130]) (d) Spinel ferro/ ferrimagnetic nanopillars embedded on a perovskite ferroelectric matrix (from Ref [137].)...

Half-Metallic Ferro-/Ferrimagnetic (HMF) Double Perovskites... 

Hirone, T. Para-, ferro- and ferrimagnetic compounds containing ions with incomplete d-sheU. Landolt-Bomstein-TabeUen, Vol. 2, Part. 9, 1—142 (1962). 

As this field continues to develop, look for improvements not only in the magnetic properties of these organic polymers, bnt also in the theoretical descriptions of intrinsic ferro- and ferrimagnetism in polymers. 

Sf ferro- or ferrimagnetic ordering temperature (Curie point)... 

Sr2FeMo06- While this material has been known since 1963, intense interest was sparked by the announcement of room temperature MR in 1998. The material is ferro or ferrimagnetic with Tc > 400 K and a metallic conductor, Figure 35. This unusual combination of properties can be explained in terms of the half-metallic ferromagnetic electronic structure model. Figure 36. Note that the Fermi... 

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