Fig. 3: Magnetic performance and domain wall pinning mechanisms at room and elevated temperatures.
From: Strong and ductile high temperature soft magnets through Widmanstätten precipitates
a Thermomagnetic and DSC curves. Tc1 and Tc2 on the thermomagnetic curve of the WP-MCA denote the Curie temperatures (Tc) of the fcc matrix and D019 precipitates, respectively. T1 and T2 on the DSC curve show the exothermic and second-order effects, respectively. b Ms value of the fcc matrix and the D019 precipitate at different temperatures. c Temperature dependence of reduced saturation magnetization. The Brillouin function theory expressions with J = 1/2, 1 and ∞ are shown, where J represents the total angular momentum quantum number of the atom. The experimental results are compared for the current new alloys, cobalt-nickel, and pure iron as reference materials. d Evolution of domain structures following the hysteresis loop (left) under Kerr observation at room temperature. The schematic illustrates the D019 precipitates in the WP-MCA and the grain boundary (GB) in the HM-MCA. e Magnetization as a function of the applied external magnetic field acquired from the surface loop by high-temperature MOKE measurement of the WP-MCA. MP magnetization process, MR magnetization reversal. The corresponding magnified loop curves at 773 K (right-top) and 300 K (right-bottom) are shown. f The magnetic domain structure evolution of the WP-MCA (top images) and HM-MCA (bottom images) at 773 K, respectively.
