2026-04-13T02:20:14Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/221072025-12-04T20:42:10Zcom_2072_1057col_2072_478822col_2072_478917

00925njm 22002777a 4500 dc Batlle Gelabert, Xavier author García del Muro y Solans, Montserrat author Tejada Palacios, Javier author Pfeiffer, H. author Gornert, P. author Sinn, E. author 2012-02-16T08:49:45Z 2012-02-16T08:49:45Z 1993 We have studied the static magnetic properties of three different M‐type doped barium ferrite compounds prepared by the glass crystallization method. The zero‐field‐cooled (ZFC) and field‐cooled (FC) processes have been recorded at low field and they all show the typical features of a small particle system. The ZFC curves display a broad peak at a temperature TM, which depends on the distribution of particle volumes in the sample. Isothermal magnetization curves M(H) at several temperatures and saturation magnetization Ms as a function of temperature have been measured for the Co‐Ti sample (BaFe10.4Co0.8Ti0.8O19). The dependence on temperature of the macroscopic magnetic parameters has been analyzed. The distribution of blocking temperatures is studied from the derivative of the remanent‐to‐saturation magnetization ratio with respect to temperature and it is fitted to a lognormal distribution, leading to a mean blocking temperature 〈TB〉=(81±40) K. The distribution of volumes of the magnetic unit is also obtained from this fitting. The dependence on temperature of the coercive field follows a Tk‐law below 35 K. The value of the k exponent is discussed within the scope of two models: (i) the aligned case (k=0.5) and (ii) the random case (k=0.77). Materials ferromagnètics Ferrita Nanocristalls Anisotropia Física de l'estat sòlid Ferromagnetic materials Ferrite Nanocrystals Anisotropy Solid state physics Magnetic study of the M-type doped barium ferrite nanocrystalline powders