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DY: Dynamik und Statistische Physik
DY 16: Wachstumsprozesse und Grenzfl
ächeneigenschaften
DY 16.5: Talk
Monday, March 26, 2001, 17:30–17:45, S 5.5
Domain wall roughening in dipolar films with disorder — •Jaime Santos1, Erwin Frey2, and Franz Schwabl1 — 1Physik Department der TU-München-T34, James Franck Strasse, D-85747 Garching — 2Lyman Laboratory of Physics, Harvard University, Cambridge, MA 02138, USA
We derive a low-energy Hamiltonian for the elastic energy of a Néel domain wall in a thin film with in-plane magnetization, where we consider the contribution of the long-range dipolar interaction. We show that such Hamiltonian is analogous to the Hamiltonian of a one-dimensional polaron in an external random potential. We use a replica variational method to compute the roughening exponent of the domain wall.