Domain branching in uniaxial ferromagnets: A scaling law for the minimum energy

We address the branching of magnetic domains in a uniaxial ferromagnet. Our thesis is that branching is required by energy minimization. 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 lo wer bound which matches the already-known upper bound. We further show that any domain pattern achieving this scaling law must have average width of o rder L-2/3, where L is the length of the magnet in the easy direction, Fina lly we argue that branching is required, by considering the constrained var iational problem in which branching is prohibited and the domain structure is invariant in the easy direction, Its scaling law is different.