Abstract
Detailed micromagnetic study of internal structure and dynamics of domain wall in ultrathin magnetic film with thickness tf≪lex (lex is the exchange length) is carried out. It is revealed that deviations of stationary magnetization distribution inside the wall from the one of the Bloch domain wall are small and proportional to (tf/lex)Q−1. The limiting velocity of uniform domain wall motion coincides with the same for the Bloch wall (Walker’s critical velocity) with an accuracy of terms proportional to (tf/lex)2. It is also found that the same small parameter describes deviation of stationary distribution of magnetization in a vertical Bloch line and deviation of Bloch line velocity from the expressions found for films with tf>lex.
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