Magnetic ordering in Ni-rich NiMn alloys around the multicritical point: Experiment and theory
2012 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 85, no 17, 174405- p.Article in journal (Refereed) Published
We have carried out an experimental study of Ni-rich NiMn alloys in a series of compositions across the multicritical point and determined the phase diagram within that range. We have observed ferromagnetic long-range order with reentrant spin-glass/ferro-spin-glass phase for x <= 25, an antiferromagnetic long-range order around x similar to 37, and a gradual change from a canonical spin-glass state to a long-range antiferromagnetic phase in the intermediate composition region. In order to explain the experimental observations, we have examined the physical properties from a density functional based first-principals theoretical analysis and used it to understand the experimental results. Using atomic spin dynamics simulations based on the Landau-Lifshitz-Gilbert equation, we have found the aging behavior and anomalously slow relaxation of magnetization in the composition range where experiment observes spin-glassy behavior.
Place, publisher, year, edition, pages
2012. Vol. 85, no 17, 174405- p.
IdentifiersURN: urn:nbn:se:uu:diva-175198DOI: 10.1103/PhysRevB.85.174405ISI: 000303652400002OAI: oai:DiVA.org:uu-175198DiVA: diva2:531570