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

Authors Du, Jun HKUST affiliated (currently or previously).
Zhang, Bei
Zheng, Rongkun HKUST affiliated (currently or previously).
Zhang, Xixiang HKUST affiliated (currently or previously)
Issue Date 2007
Source Physical Review B , v. 75, (1), January 2007, 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°C for 1h. 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.
ISSN 1098-0121
Rights © 2007 American Physical Society
Language English
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