Phys. Rev. B 68, 054433 (2003) [5 pages]Relaxation and aging of a superferromagnetic domain stateReceived 27 May 2003; revised 7 July 2003; published 29 August 2003 In agreement with recent model calculations on interacting magnetic nanoparticles the magnetic relaxation of a field-cooled superferromagnetic (SFM) granular multilayer [Co80Fe20(1.4nm)/Al2O3(3nm)]10 follows a power-law decay retaining a finite asymptotic remanence. Unexpectedly, a second isothermal upward relaxation is observed after field quenching the sample. It is attributed to slow equilibration of the thermoremanent magnetization inside the SFM domains. Magnetization hole burning via aging reveals the chaotic nature of the domain state. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.68.054433
DOI:
10.1103/PhysRevB.68.054433
PACS:
75.60.Lr, 75.10.Nr, 75.50.Tt, 76.60.Es
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