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Model of bound interface dynamics for coupled magnetic domain walls (Articolo in rivista)

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Model of bound interface dynamics for coupled magnetic domain walls (Articolo in rivista) (literal)

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P. Politi (1); P. J. Metaxas (2,3,4); J.-P. Jamet (3); R. L. Stamps (2,5); J. Ferré (3) (2011)
Model of bound interface dynamics for coupled magnetic domain walls
in Physical review. B, Condensed matter and materials physics; American Physical Society (APS), College Pk (Stati Uniti d'America)
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P. Politi (1); P. J. Metaxas (2,3,4); J.-P. Jamet (3); R. L. Stamps (2,5); J. Ferré (3) (literal)

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1) Istituto dei Sistemi Complessi, Consiglio Nazionale delle Ricerche, Via Madonna del Piano 10, I-50019 Sesto Fiorentino, Italy 2) School of Physics, M013, University of Western Australia, 35 Stirling Hwy, Crawley WA 6009, Australia 3) Laboratoire de Physique des Solides, Université Paris-Sud, CNRS, UMR 8502, F-91405 Orsay Cedex, France 4) Unité Mixte de Physique CNRS/Thales, 1 Avenue Augustin Fresnel, 91767 Palaiseau Cedex, France and Université Paris-Sud 11, F-91405, Orsay Cedex, France 5) SUPASchool of Physics and Astronomy, University of Glasgow, G12 8QQ Glasgow, United Kingdom (literal)

Titolo

Abstract

A domain wall in a ferromagnetic system will move under the action of an external magnetic field. Ultrathin Co layers sandwiched between Pt have been shown to be a suitable experimental realization of a weakly disordered 2D medium in which to study the dynamics of 1D interfaces (magnetic domain walls). The behavior of these systems is encapsulated in the velocity-field response v(H) of the domain walls. In a recent paper [ P. J. Metaxas et al. Phys. Rev. Lett. 104 237206 (2010)] we studied the effect of ferromagnetic coupling between two such ultrathin layers, each exhibiting different v(H) characteristics. The main result was the existence of bound states over finite-width field ranges, wherein walls in the two layers moved together at the same speed. Here we discuss in detail the theory of domain wall dynamics in coupled systems. In particular, we show that a bound creep state is expected for vanishing H and we give the analytical, parameter free expression for its velocity which agrees well with experimental results. (literal)

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