Free ferromagnet

We report herein a single crystal polarized neutron investigation of the spin density of two purely organic nitronyl nitroxide free radicals which present ferromagnetic interactions the 2-(6-ethynyl-2-pyridyl)-4,4,5,5-tetramethylimidazoline-l-oxyl-... 

Design of ferromagnetic coupling among organic free radicals and high-spin molecules in molecular assemblies... 

Cobalt-based catalysts are effective in the ethanol reformation to hydrogen. Many oxides have been used to prepare supported cobalt catalysts of low cobalt content (circa 1 wt%) by impregnation from a solution of Co2(CO)8 catalysts were used in the ethanol reformation as prepared [156]. The performance of the catalysts in the steam reforming of ethanol was related with the presence, under reaction conditions, of metallic (ferromagnetic) cobalt particles and oxidized cobalt species. An easy exchange between small metallic cobalt particles and oxidized cobalt species was found. Comparison of Co/ZnO catalysts prepared from Co2(CO)8 or from nitrate precursor indicated that the catalyst prepared from the carbonyl precursor was highly stable and more selective for the production of CO-free hydrogen... 

We illustrate the CVD preparation of thin films with some examples. The selected materials are ferromagnetic [Fe+ (Cp )2][TCNE] and the solvent-free V(TCNE) c phase. [Ee+ (Cp )2][TCNE] is a ferromagnet with Tq = 4.8 K (Miller etal, 1988) and V[TCNE] c orders magnetically above 350 K (Manriquez et al., 1991), as previously discussed in Section 1.5. Table 3.2 summarizes the CVD conditions for growth of the thin films. V(TCNE) c and [Fe+ (Cp )2][TCNE] correspond to type I and II, respectively. 

In hard disk read heads, one ferromagnetic layer has its spin orientation fixed by coupling to an antiferromagnetic layer (Figure 9.13). A second ferromagnetic layer separated from the first by a nonmagnetic metal, is free to change its spin orientation when a field is applied. 

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