Please use this identifier to cite or link to this item: http://hdl.handle.net/1783.1/2936

Memory effect and spin-glass-like behavior in Co-Ag granular films

Authors Du, J.
Zhang, B.
Zheng, R. K.
Zhang, X. X.
Issue Date 2007
Source PHYSICAL REVIEW B , v. 75, (1), 2007, JAN, article number 014415
Summary The memory effect was clearly observed in dc-sputtered metallic, magnetic Co-Ag granular films, which indicates the existence of a spin-glass-like phase at low temperatures. However, the memory effect diminished dramatically after the films were annealed at 300 degrees C for 1 h. It was also found that the memory effect weakened gradually with increasing volume fraction of magnetic clusters. The experimental results indicate that the dipolar interaction is not the major origin for the formation of low-temperature spin-glass-like (SGL) phase in metallic, magnetic granular materials. On the other hand, a Ruderman-Kittel-Kasuya-Yosida-like exchange interaction between the nanoparticles may be responsible for the collective SGL dynamics and the resulting memory effect.
Subjects
ISSN 1098-0121
Rights Physical Review B © copyright (2007) American Physical Society. The Journal's web site is located at http://prb.aps.org/
Language English
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