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Aging and memory effects in a mechanically alloyed nanoparticle system
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
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2007 (English)In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 313, no 2, 373-377 p.Article in journal (Refereed) Published
Abstract [en]

Ageing and memory experiments have been performed to explore the non-equilibrium dynamics of the mechanically alloyed nanoparticle system Fe30Ag40W30, which comprises a heterogeneous ensemble of magnetic particles with average moment 102 μB dispersed in a metallic non-magnetic matrix. This system has earlier, from critical slowing down analysis, been reported to enter a spin glass like state at low temperatures [J. A. de Toro et al., Phys. Rev. B 69, (2004) 224407]. The wait time dependence of the magnetic relaxation observed after the application of a weak magnetic field and the memory of the thermal history in the low temperature phase recorded on continuous heating in a weak applied field show similar features as observed in corresponding experiments on canonical spin glasses.

Place, publisher, year, edition, pages
2007. Vol. 313, no 2, 373-377 p.
Keyword [en]
Magnetic ageing, Mechanical alloying, Spin glass, Fine magnetic particles
National Category
Physical Sciences Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-14874DOI: 10.1016/j.jmmm.2007.02.006ISI: 000246325500019OAI: oai:DiVA.org:uu-14874DiVA: diva2:42645
Available from: 2008-01-31 Created: 2008-01-31 Last updated: 2017-12-11Bibliographically approved

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Nordblad, Per

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