Structural properties and temperature dependence of coercivity of DC Joule-heated Fe86Zr7B6Cu1 ribbons
Abstract Amorphous Fe86Zr7B6Cu1 ribbons obtained by melt spinning were submitted to a DC Joule-heating treatment in vacuum. In order to obtain different stages of crystallization the current density was varied. Resistivity measurements of the sample were performed before, during and after the treatment. Quasistatic hysteresis measurements of the samples were performed to study the coercivity and magnetization. Drastic changes of coercivity as a function of current density were observed and discussed. A comparison between the Joule-heated and a conventionally annealed sample is given. The structural changes were investigated by X-ray diffractrometry and transmission electron microscopy (TEM). The two-phase character of the samples was studied by measuring the temperature dependence of the hysteresis loop.
The problem addressed by the present invention is to provide a method for manufacturing a conductive nanofiber that can produce a conductive nanofiber that has sufficient conductivity using various types of plating metal and plating fluids without complicated operations. ::: The problem is addressed by a method for manufacturing a conductive nanofiber characterized by including a fiber spinning step for fabricating the nanofiber according to an electrospinning process with a resin composition that includes (a) a thermoplastic resin, (b) a hyperbranched polymer having ammonium groups at molecular ends and a weight average molecular weight of 1,000 - 5,000,000, and (c) fine metal particles as the spinning material and a plating step for electroless plating of the nanofiber fabricated in the fiber spinning step.