Aging and memory effects in a mechanically alloyed nanoparticle system
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
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.
Magnetic ageing, Mechanical alloying, Spin glass, Fine magnetic particles
Physical Sciences Engineering and Technology
IdentifiersURN: urn:nbn:se:uu:diva-14874DOI: 10.1016/j.jmmm.2007.02.006ISI: 000246325500019OAI: oai:DiVA.org:uu-14874DiVA: diva2:42645