Commercial water dispersions of Fe/Fe–O nanoparticles (!50–80nm diameter) were prepared bare and treated with a biodegradable polymer to stabilize the suspension. Hysteresis loops and FC–ZFC curves of samples in liquid and dried form were measured by means of a vibrating sample magnetometer from 77 to 300 K. A marked dependence on the conditioning field is observed in all samples that display the Verwey transition at about 120 K. The role of magnetic interactions on dried samples was also investigated by means of magnetoresistance measurements as a function of temperature
Temperature dependence of magnetic properties in Fe/Fe-O nanoparticles dispersed in water / Coisson, Marco; F., Celegato; E., DALLA VECCHIA; R., Sethi; Tiberto, PAOLA MARIA; Vinai, Franco. - In: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS. - ISSN 0304-8853. - 321:14(2009), pp. 2276-2278. [10.1016/j.jmmm.2009.01.039]
Temperature dependence of magnetic properties in Fe/Fe-O nanoparticles dispersed in water
COISSON, MARCO;F. CELEGATO;TIBERTO, PAOLA MARIA;VINAI, FRANCO
2009
Abstract
Commercial water dispersions of Fe/Fe–O nanoparticles (!50–80nm diameter) were prepared bare and treated with a biodegradable polymer to stabilize the suspension. Hysteresis loops and FC–ZFC curves of samples in liquid and dried form were measured by means of a vibrating sample magnetometer from 77 to 300 K. A marked dependence on the conditioning field is observed in all samples that display the Verwey transition at about 120 K. The role of magnetic interactions on dried samples was also investigated by means of magnetoresistance measurements as a function of temperatureI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
