This essential composite
structure is achieved through spinodal decomposition. The α1 rods
are formed with their axes of elongation parallel to the o1004
direction, the easy magnetization direction. The final magnetic
properties are obtained through two critical steps, thermomagnetic
treatment at 800–850 °C for 10–20 min and low temperature
tempering at 550–650 °C for 10–20 h [2].