書誌事項
- 公開日
- 2005-03-07
- 権利情報
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- http://link.aps.org/licenses/aps-default-license
- DOI
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- 10.1103/physrevb.71.104404
- 公開者
- American Physical Society (APS)
この論文をさがす
説明
Effects of temperature changes on the nonequilibrium spin-glass dynamics of a strongly interacting ${\mathrm{Fe}}_{3}\mathrm{N}$ ferromagnetic nanoparticle system (superspin glass) are studied by ac susceptibility measurements. In contrast to atomic spin glasses, strong cooling-rate effects are observed and no evidence for temperature chaos is found for the small temperature changes $(\ensuremath{\Delta}T∕{T}_{\mathrm{g}}l0.07)$ possible to investigate by the twin-temperature-shift method. Still, transient relaxation is observed after such small temperature changes. The transient contribution to the ac susceptibility can be understood as the adjustment of thermally active droplets, which is, mutatis mutandis, the Kovacs effect observed in most glassy systems. For larger temperature changes rejuvenation-like effects are observed. Both transient relaxation and effects related to temperature chaos can contribute to such effects. The flip time of a magnetic moment is much longer than that of an atomic spin and hence much shorter time scales, in units of the microscopic flip time, are probed within the experimental time window for a superspin glass than for an atomic spin glass. The length scales developed and probed during an experiment are also shorter for the superspin glass indicating that the influence of a temperature-chaos overlap length is weaker, in agreement with the present observations.
収録刊行物
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- Physical Review B
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Physical Review B 71 (10), 104404-, 2005-03-07
American Physical Society (APS)
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詳細情報 詳細情報について
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- CRID
- 1361699994624178304
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- ISSN
- 1550235X
- 10980121
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- データソース種別
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- Crossref
- OpenAIRE