Domain Branching in Uniaxial Ferromagnets: a Scaling Law for the Minimum Energy

نویسندگان

  • Rustum Choksi
  • Robert V. Kohn
  • Felix Otto
چکیده

We address the branching of magnetic domains in a uniaxial ferromagnet. Our thesis is that branching is required for a domain pattern to have nearly{minimal energy. To show this, we consider the nonlocal, nonconvex variational problem of micromagnetics. We identify the scaling law of the minimum energy, by proving a rigorous lower bound which matches the already-known upper bound. We further show that any domain pattern achieving this scaling law must have average width of order L 2=3 , where L is the length of the magnet in the easy direction. Finally we argue that branching is required, by considering the constrained variational problem in which branching is prohibited and the domain structure is invariant in the easy direction. Its scaling law is diierent.

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تاریخ انتشار 1998