Aging in an exchange biased Fe/FeOxide nanogranular system

• Published in: Journal of magnetism and magnetic materials Vol. 310; no. 2; pp. 2289 - 2291
• Main Authors: Del Bianco, L., Fiorani, D., Testa, A.M.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01-03-2007; Elsevier Science
• Subjects: Aging effect; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Exchange bias; Magnetic properties and materials; Materials science; Nanogranular system; Nanopowders; Nanoscale materials and structures: fabrication and characterization; Physics; 75.50.Tt; 75.50.Bb; Aging effect; 75.50.Lk; Nanogranular system; Exchange bias; Nanoparticles; Spin glasses; Cooling; Exchange bias; Nanogranular system; Aging effect; Aging; 75.50.Tt; 75.50.Lk; 75.50.Bb; Exchange interactions
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2006.10.775

A strict connection between exchange bias (EB) and aging effect was observed in a system composed of Fe nanoparticles, dispersed in a structurally disordered Fe oxide matrix showing spin-glass like properties: the exchange field measured at
T=5
K can be controlled by properly varying the time,
t
w spent at
T=50
K, after applying the cooling field. The way in which the aging of the sample influences the training effect, provides information on the underlying mechanism of the phenomenon in this system.