Superferromagnetic domain state of a discontinuous metal insulator multilayer

S. Bedanta*, O. Petracic, E. Kentzinger, W. Kleemann, U. Rücker, A. Paul, Th Brückel, S. Cardoso, P. P. Freitas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Scopus citations


Polarized neutron reflectivity (PNR) and magnetometry studies have been performed on the granular multilayer [Co80 Fe20 (1.3 nm)/Al2 O3 (3 nm)] 10. Due to strong interparticle interactions, a collective superferromagnetic state is encountered. Cole-Cole plots drawn from the complex ac susceptibility are measured as functions of frequency, temperature, and field amplitudes that hint at the relaxation, creep, sliding, and switching regimes of pinned domain walls that are in close agreement with results obtained from simulations. Very slow switching with exponential relaxation under near-coercive fields is confirmed by PNR measurements. The complete absence of spin-flip scattering confirms that the magnetization reversal is achieved merely by domain nucleation and growth.

Original languageEnglish
Article number024419
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number2
StatePublished - 1 Jul 2005
Externally publishedYes


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