Hamburg 2001 – scientific programme

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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.