Experimental investigation of inhomogeneities, nanoscopic phase separation, and magnetism in arc melted Fe-Cu metals with equal atomic ratio of the constituents

Handle URI:
http://hdl.handle.net/10754/592625
Title:
Experimental investigation of inhomogeneities, nanoscopic phase separation, and magnetism in arc melted Fe-Cu metals with equal atomic ratio of the constituents
Authors:
Hassnain Jaffari, G.; Aftab, M.; Anjum, Dalaver H.; Cha, Dong Kyu; Poirier, Gerald; Ismat Shah, S. ( 0000-0001-7959-8487 )
Abstract:
Composition gradient and phase separation at the nanoscale have been investigated for arc-melted and solidified with equiatomic Fe-Cu. Diffraction studies revealed that Fe and Cu exhibited phase separation with no trace of any mixing. Microscopy studies revealed that immiscible Fe-Cu form dense bulk nanocomposite. The spatial distribution of Fe and Cu showed existence of two distinct regions, i.e., Fe-rich and Cu-rich regions. Fe-rich regions have Cu precipitates of various sizes and different shapes, with Fe forming meshes or channels greater than 100 nm in size. On the other hand, the matrix of Cu-rich regions formed strips with fine strands of nanosized Fe. Macromagnetic response of the system showed ferromagnetic behavior with a magnetic moment being equal to about 2.13 μB/Fe atom and a bulk like negligible value of coercivity over the temperature range of 5–300 K. Anisotropy constant has been calculated from various laws of approach to saturation, and its value is extracted to be equal to 1350 J/m3. Inhomogeneous strain within the Cu and Fe crystallites has been calculated for the (unannealed) sample solidified after arc-melting. Annealed sample also exhibited local inhomogeneity with removal of inhomogeneous strain and no appreciable change in magnetic character. However, for the annealed sample phase separated Fe exhibited homogenous strain.
KAUST Department:
Imaging and Characterization Core Lab
Citation:
Experimental investigation of inhomogeneities, nanoscopic phase separation, and magnetism in arc melted Fe-Cu metals with equal atomic ratio of the constituents 2015, 118 (23):233904 Journal of Applied Physics
Publisher:
AIP Publishing
Journal:
Journal of Applied Physics
Issue Date:
16-Dec-2015
DOI:
10.1063/1.4937912
Type:
Article
ISSN:
0021-8979; 1089-7550
Additional Links:
http://scitation.aip.org/content/aip/journal/jap/118/23/10.1063/1.4937912
Appears in Collections:
Articles; Advanced Nanofabrication, Imaging and Characterization Core Lab

Full metadata record

DC FieldValue Language
dc.contributor.authorHassnain Jaffari, G.en
dc.contributor.authorAftab, M.en
dc.contributor.authorAnjum, Dalaver H.en
dc.contributor.authorCha, Dong Kyuen
dc.contributor.authorPoirier, Geralden
dc.contributor.authorIsmat Shah, S.en
dc.date.accessioned2015-12-29T10:14:18Zen
dc.date.available2015-12-29T10:14:18Zen
dc.date.issued2015-12-16en
dc.identifier.citationExperimental investigation of inhomogeneities, nanoscopic phase separation, and magnetism in arc melted Fe-Cu metals with equal atomic ratio of the constituents 2015, 118 (23):233904 Journal of Applied Physicsen
dc.identifier.issn0021-8979en
dc.identifier.issn1089-7550en
dc.identifier.doi10.1063/1.4937912en
dc.identifier.urihttp://hdl.handle.net/10754/592625en
dc.description.abstractComposition gradient and phase separation at the nanoscale have been investigated for arc-melted and solidified with equiatomic Fe-Cu. Diffraction studies revealed that Fe and Cu exhibited phase separation with no trace of any mixing. Microscopy studies revealed that immiscible Fe-Cu form dense bulk nanocomposite. The spatial distribution of Fe and Cu showed existence of two distinct regions, i.e., Fe-rich and Cu-rich regions. Fe-rich regions have Cu precipitates of various sizes and different shapes, with Fe forming meshes or channels greater than 100 nm in size. On the other hand, the matrix of Cu-rich regions formed strips with fine strands of nanosized Fe. Macromagnetic response of the system showed ferromagnetic behavior with a magnetic moment being equal to about 2.13 μB/Fe atom and a bulk like negligible value of coercivity over the temperature range of 5–300 K. Anisotropy constant has been calculated from various laws of approach to saturation, and its value is extracted to be equal to 1350 J/m3. Inhomogeneous strain within the Cu and Fe crystallites has been calculated for the (unannealed) sample solidified after arc-melting. Annealed sample also exhibited local inhomogeneity with removal of inhomogeneous strain and no appreciable change in magnetic character. However, for the annealed sample phase separated Fe exhibited homogenous strain.en
dc.language.isoenen
dc.publisherAIP Publishingen
dc.relation.urlhttp://scitation.aip.org/content/aip/journal/jap/118/23/10.1063/1.4937912en
dc.rightsArchived with thanks to Journal of Applied Physicsen
dc.titleExperimental investigation of inhomogeneities, nanoscopic phase separation, and magnetism in arc melted Fe-Cu metals with equal atomic ratio of the constituentsen
dc.typeArticleen
dc.contributor.departmentImaging and Characterization Core Laben
dc.identifier.journalJournal of Applied Physicsen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionDepartment of Physics, Quaid-i-Azam University, Islamabad, Pakistanen
dc.contributor.institutionDepartment of Physics, Government Postgraduate College, No. 1, Abbottabad, Pakistanen
dc.contributor.institutionISE Laboratory, University of Delaware, Newark, Delaware 19716, USAen
dc.contributor.institutionDepartment of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USAen
dc.contributor.institutionDepartment of Material Science and Engineering, University of Delaware, Newark, Delaware 19716, USAen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorAnjum, Dalaver H.en
kaust.authorCha, Dong Kyuen
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