Research Papers in Physics and Astronomy


Date of this Version

October 2001


Published in the Journal of Magnetism and Magnetic Materials. Available online October 21, 2001. Published in February 2002, pages 433-435.


Discontinuous metal–insulator multilayers [Co80Fe20(t)/Al2O3(3 nm)]n were studied by SQUID magnetometry and AC susceptometry. CoFe forms ferromagnetic particles in the Al2O3 matrix. In this paper, we focus on the field dependence of the AC susceptibility of samples with t=1.3 nm. We find strong evidence for transitions from a superpara- to a superferromagnetic and, finally, to a reentrant superspin glass previous state.

Included in

Physics Commons