First Magnetocrystalline Anisotropy Constants of Some Iron-Silicon Alloys

Abstract

First magnetocrystalline anisotropy constants K_1∞ of 3.6, 6.7, 8.8, and 12.4 wt% silicon in iron alloys have been measured at 77°K and 297°K by determining the torque exerted on {100} single‐crystal disks in uniform magnetic fields. The following results on disordered alloys have been obtained: $$\begin{array}{ccc}\mathrm{Composition\; (wt}\%\mathrm{Si)}& \mathrm{Temperature}{\mathrm{\hspace{0.17em}(}}^{\circ }\mathrm{K)}& K_{\text{1∞}}{\text{×10}}^3({\mathrm{erg\; cm}}^{\text{−3}})\\ \text{3.6}& 77& \text{430±10}\\ & 297& \text{360±10}\\ \text{6.7}& 77& \text{290±10}\\ & 297& \text{205±10}\\ \text{8.8}& 77& \text{245±10}\\ & 297& \text{165±10}\\ \text{12.4}& 77& \text{120±5}\\ & 297& \text{78±5}\end{array}$$ The measurements of this investigation are compared with the previously known studies. The agreement, where an overlap occurs, is satisfactory.