دراسة نظرية لتحديد عوامل الجسوءة في بلّورة المادة الفيرومغناطيسية ( الحديدية المغنطة )

This work studies the determination of stiffness factors , and in ferromagnetic crystal which enter into the calculations of anisotrophic constants of ferromagnetic crystal . However , Value intervals of C3 which coresponds to the existence of parallel states , and antiparallel states between the magnetic crystal vector and applied magnetic field vector . In addition , the suitable intervals for the magnetic jumps between two states have been found.