Full text loading...
Magnetic hysteresis loops measured at 300 K for (a) amorphous, (b) soft, and (c) hard ribbons. Demagnetization for a hard ribbon at room temperature and the energy product which reaches a maximum of 6.7 MGOe.
X-ray diffraction patterns collected at room temperature from the surfaces of ribbons. Two curves are reported for each sample. The upper curves are from the shinier, free side of the ribbons. The lower curves are from the duller side which contacted the wheel.
Temperature dependence of the magnetization (M) above room temperature. Data were collected on warming in an applied field of 500 Oe. The inset shows the measured, unsubtracted heat flow form differential thermal analysis of amorphous (ms24). Data were collected with a heating/cooling rate of 5 K/min on a 25 mg sample. Exothermic peaks in the thermal analysis on warming and step-like features in the magnetization data between 800 and 900 K indicate two irreversible phase transformations occur in this temperature range.
Electron microscopy results for ribbons. Backscattered SEM images are shown on the left, and bright-field TEM images are shown on the right, with selected area electron diffraction patterns in the insets. Images from ms24 are shown in (a) and (b), ms16-soft in (c) and (d), and ms16-hard in (e) and (f). The compositional contrast in SEM images is enhanced by chemical etching that preferentially attacks the cobalt rich regions. Note the difference in scale between (d) and (f).
Processing conditions for melt-spun samples of described in this report, and their magnetic properties measured at 300 K.
Article metrics loading...