Authors
W. Kleeman, Laboratorium fu¨r Angewandte Physik, Gerhard-Mercator-Universita¨t, D-47048 Duisburg, Germany
O. Petracic, Laboratorium fu¨r Angewandte Physik, Gerhard-Mercator-Universita¨t, Duisburg, Germany
Christian Binek, University of Nebraska-LincolnFollow
G.N. Kakazei, IFIMUP, Departamento de Fisica, Universidade de Porto, Porto, Portugal
Yu. G. Pogorelov, IFIMUP, Departamento de Fisica, Universidade de Porto, Porto, Portugal
J.B. Sousa, IFIMUP, Departamento de Fisica, Universidade de Porto, Porto, Portugal
S. Cardoso, INESC, Rua Alves Redol 9-1, Lisbon, Portugal
P.P. Freitas, INESC, Rua Alves Redol 9-1, Lisbon, Portugal
Date of this Version
March 2001
Abstract
Dipolar superferromagnetism with reentrant low-temperature superspin glass behavior is observed on a randomly distributed ferromagnetic nanoparticle systems in discontinuous metal-insulator multilayers [Co80Fe20/Al2O3 (3 nm)] 10 with nominal thickness 1.1<~t<~1.3 nm by use of ac susceptometry and dc magnetometry. At t=1.0 nm, superspin glass-like freezing is evidenced by the criticality of dynamic and nonlinear susceptibilities.
Comments
Published by American Physical Society. Copyright 2001. Permission to use. Phys. Rev. B 63, 134423 (2001).