Effect of diameters on the magnetic properties of glass-coated amorphous alloy microwires

The glass-coated amorphous FeCuNbVSiB，FeBSiCMn and CoNiFeSiB microwires with diameters 6.3～28.2μm，20.2～28.0μm and 14.0～35.2μm were synthesized by the Tayor-Ulitovsky method，respectively. The microstructure，morphology and magnetic properties of the microwires samples were studied by X-ray diffractometry (XRD)，scanning electron microscope (SEM) and vibrating sample magnetometer (VSM). The effects of different glass coating thicknesses and metal core diameters on the magnetic parameters of microwires samples were analyzed. The results show that the sequence influencing factors on the magnetic properties are the saturation magnetostriction coefficient，the composition and the dimension of the microwires in turn. With the increase of the microwires core diameter and glass coating thickness，the radial saturation fields of all the samples continually decrease，the coercive force of the Co-rich microwires decreases from 171 A/m to 63 A/m，but the coercive force of the FeCuNbVSiB and FeBSiCMn microwires decreases from 508 A/m and 390 A/m to 486 A/m and 278 A/m，then increases to 2570 A/m and 342 A/m，respectively.