Research Papers in Physics and Astronomy

 

Date of this Version

3-13-2002

Comments

Published by American Physical Society. © 2002. Permission to use. Phys. Rev. B 65, 134406 (2002).

Abstract

Ferromagnetic single domain particles of CoFe in discontinuous magnetic multilayers [Co80Fe20 (0.9 nm)/ Al2O3(3 nm)] 10 reveal spin-glass ordering below Tg=43.6 K as evidenced by the criticality of the nonlinear susceptibility. Dynamic critical scaling yields exponents zν=8.0 and β=1.0 in both zero and weak applied field, where an Almeida-Thouless line is encountered. In fields exceeding 2 mT a crossover into a chiral glass regime seems to occur.

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