Dynamic surface scaling behavior of isotropic Heisenberg ferromagnets.pdfVIP

Dynamic surface scaling behavior of isotropic Heisenberg ferromagnets.pdf

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Dynamic surface scaling behavior of isotropic Heisenberg ferromagnets

Dynamic surface critical behavior of isotropic Heisenberg ferromagnets 1 2 2 1 M. Krech , H. Karl , and H. W. Diehl 0 1 Fachbereich Physik, Bergische Universitat - GH Wuppertal, 42097 Wuppertal, Federal Republic of ¨ 0 2 Germany 2 Fachbereich Physik, Universitat - GH Essen, 45117 Essen, Federal Republic of Germany ¨ b e (February 1, 2008) F 7 ] h Abstract c e m The effects of free surfaces on the dynamic critical behavior of isotropic Heisenberg - t ferromagnets are studied via phenomenological scaling theory, field-theoretic renor- a t malization group tools, and high-precision computer simulations. An appropriate s t. semi-infinite extension of the stochastic model J is constructed, the boundary terms a m of the associated dynamic field theory are identified, its renormalization in d ≤ 6 - dimensions is clarified, and the boundary conditions it satisfies are given. Scaling d laws are derived which relate the critical indices of the dynamic and static infrared n o singularities of surface quantities to familiar static bulk and surface exponents. Ac- c curate computer-simulation data are presented for the dynamic surface structure fac- [ tor; these are in conformity with the predicted scaling behavior and could be checked 1 v by appropriate scattering experiments. 1 PACS numbers: 75.

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