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Type: Artigo de periódico
Title: Mobility of Bloch walls via the collective coordinate method
Author: Desposito, MA
Ferrer, AV
Caldeira, AO
Neto, AHC
Abstract: We have studied the problem of the dissipative motion of Bloch walls considering a totally anisotropic one-dimensional spin chain in the presence of a magnetic field. Using the so-called 'collective coordinate method' we construct an effective Hamiltonian for the Bloch wall coupled to the magnetic excitations of the system. It allows us to analyze the Brownian motion of the wail in terms of the reflection coefficient of the effective potential felt by the excitations due to the existence of the wall. We find that for finite values of the external field the wall mobility is also finite. The spectrum of the potential at large fields is investigated and the dependence of the damping constant on temperature is evaluated. As a result we find the temperature and magnetic-field dependence of the wall mobility.
Country: EUA
Editor: American Physical Soc
Citation: Physical Review B. American Physical Soc, v. 62, n. 2, n. 919, n. 927, 2000.
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.62.919
Date Issue: 2000
Appears in Collections:Unicamp - Artigos e Outros Documentos

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