513.001 Molecular and Solid State Physics

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Physical
Constants

Periodic System
of Elements

      

Bloch wall

The Heisenberg Hamiltonian describes the effective interaction between spins in a ferromagnet.

If only nearest neighbor interactions are considered, how much energy is necessary to create a Bloch wall in a line of spins such as the one shown in the drawing below? The spacing between the spins is a.