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Thermodynamic-state and kinetic-process dependent dual ferromagnetic states in high-Si content FeMn(PSi) alloys
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics. Department of Physics and Astronomy, Division of Materials Theory, Uppsala University, Uppsala, Sweden.ORCID iD: 0000-0003-2832-3293
2015 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 118, no 21, 213903Article in journal (Refereed) PublishedText
Abstract [en]

We have found that thermodynamic state and kinetic process co-determine the dual ferromagnetic (FM) orders in high-Si content FeMnP1- xSix (0.25 < x < 0.5). Alloys undergoing high temperature annealing and quenching process prefer a high magnetic moment FM state in a chemically partial disordered structure with low c/a ratio. This mechanism is suggested to be responsible for the often discussed virgin effect as well. A chemically ordered structure obtained by a slow cooling process from a relatively low annealing temperature and the increase in Si content stabilize a metastable lattice with high c/a ratio and FM order with low magnetic moment. The non-simultaneity of the magnetic and structural transitions can be responsible for the occurrence of FM state in the high c/a range. Thus, a c/a ratio that changes from high to low is physically plausible to stabilize the metastable FM order at low temperature. Our theoretical observations indicate that suitable thermodynamic state and kinetic diffusion process is crucial for optimizing magnetocaloric properties and exploring feasible magnetocaloric materials.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2015. Vol. 118, no 21, 213903
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-181829DOI: 10.1063/1.4936835ISI: 000369918100011ScopusID: 2-s2.0-84949036154OAI: oai:DiVA.org:kth-181829DiVA: diva2:902087
Funder
Swedish Research CouncilKnut and Alice Wallenberg FoundationStandUp
Note

QC 20160210. QC 20160318

Available from: 2016-02-10 Created: 2016-02-05 Last updated: 2016-03-18Bibliographically approved

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