Remanence properties of Co-precipitated cobalt ferrite

Exchange-spring behavior in nanopowders of CoFe2O4–CoFe2

“…The negative peak in ␦m is a signature of demagnetizing ͑dipolar͒ interactions in nanopowder samples. 15 The observed reduction in the size of the negative peak may be interpreted as being due to the presence of magnetizing ͑exchange-type͒ interactions. Moreover, its influence in the size of the demagnetizing peak can be made more explicit by subtracting the ␦m curve for Fig.…”

Magnetic properties of core/shell-structured CoFe2/CoFe2O4 composite nano-powders synthesized via oxidation reaction

“…It is known that, in general, a negative δm indicates inter-particle dipole interaction, while a positive one indicates inter-particle exchange coupling. 27 As shown in Fig. 4, the δm data of samples CF, 18CFO, 78CFO, and 93CFO are negative under all fields, while positive high-field δm data were found for samples 30CFO and 56CFO, and especially for sample 30CFO, indicating stronger inter-particle exchange coupling.…”

Evidence of magnetic dipolar interaction in micrometric powders of the Fe50Mn10Al40 system: Melted alloys

“…Examples of the applications of these plots are given in Refs. [38][39][40][41][42]. To construct a Henkel plot is necessary to measure the dc demagnetization remanence M d (H), the isothermal remanence M r (H) and the saturation remanence value M r (H-N).…”