Domain Wall Relaxation, Creep, Sliding, and Switching in Superferromagnetic Discontinuous Co₈₀Fe₂₀/Al₂O₃ Multilayers

Authors

• X. Chen, Laboratorium fu¨ r Angewandte Physik, Gerhard-Mercator-Universita¨t, Duisburg, Duisburg, Germany
• O. Sichelschmidt, Laboratorium fu¨ r Angewandte Physik, Gerhard-Mercator-Universita¨t, Duisburg, Duisburg, Germany
• Wolfgang Kleemann, Laboratorium fu¨ r Angewandte Physik, Gerhard-Mercator-Universita¨t, Duisburg, Duisburg, GermanyFollow
• Christian Binek, University of Nebraska-LincolnFollow
• J.B. Sousa, IFIMUP, Departamento de Fisica, Universidade de Porto, Porto, Portugal
• Susana Cardoso de Freitas, INESC, Rua Alves Redol 9-1, Lisbon, PortugalFollow
• P.P. Freitas, INESC, Rua Alves Redol 9-1, Lisbon, Portugal

Document Type

Article

Date of this Version

9-23-2002

Comments

Published by American Physical Society. © 2002. Permission to use. Phys. Rev. Lett. 89, 137203 (2002).

Abstract

The ac susceptibility of a superferromagnetic discontinuous multilayer [Co₈₀Fe₂₀(1.4   nm)/ Al₂O₃(3   nm)]10 is measured as a function of temperature, frequency, and field amplitude and compared to static and dynamic hysteresis loops. Its properties are successfully mapped onto the predicted [T. Nattermann, V. Pokrovsky, and V. M. Vinokur, Phys. Rev. Lett. 87, 197005 (2001).] dynamical phase transitions, which link the relaxation, creep, sliding, and switching regimes of pinned domain walls.