Vis enkel innførsel

dc.contributor.authorRobinson, Peter
dc.contributor.authorHarrison, Richard J.
dc.contributor.authorFabian, Karl
dc.contributor.authorMcEnroe, Suzanne
dc.date.accessioned2018-03-20T16:23:21Z
dc.date.available2018-03-20T16:23:21Z
dc.date.created2012-11-01T10:47:04Z
dc.date.issued2012
dc.identifier.citationGeophysical Journal International. 2012, 191 (3), 1025-1047.nb_NO
dc.identifier.issn0956-540X
dc.identifier.urihttp://hdl.handle.net/11250/2491338
dc.description.abstractPaper II of this series described the chemical and microstructural evolution of ferri-ilmenite solid solutions during high-T quench and short-term annealing. Here we explore consequences of these Fe–Ti ordering-induced microstructures and show how they provide an explanation for both self-reversed thermoremanent magnetization and room-T magnetic exchange bias. The dominant antiferromagnetic interactions between (001) cation layers cause the net magnetic moments of ferrimagnetic ordered phases to be opposed across chemical antiphase domain boundaries. Magnetic consequences of these interactions are explored in conceptual models of four stages of microstructure evolution, all having in common that A-ordered and B-anti-ordered domains achieve different sizes, with smaller domains having higher Fe-content, lesser Fe–Ti order, and slightly higher Curie T than larger domains. Stage 1 contains small Fe-rich domains and larger Ti-rich domains separated by volumes of the disordered antiferromagnetic phase. Magnetic linkages in this conceptual model pass through disordered host, but self-reversed TRM could occur. In stage 2, ordered domains begin to impinge, but some disorder remains, creating complex magnetic interactions. In stages 3 and 4, all disordered phase is eliminated, with progressive shrinkage of Fe-rich domains, and growth of Ti-rich domains. Ordered and anti-ordered phases meet at chemical antiphase and synphase boundaries. Strong coupling across abundant antiphase boundaries provides the probable configuration for self-reversed thermoremanent magnetization. Taking the self-reversed state into strong positive fields provides a probable mechanism for room-temperature magnetic exchange bias.nb_NO
dc.language.isoengnb_NO
dc.publisherOxford University Pressnb_NO
dc.titleChemical and magnetic properties of rapidly cooled metastable ferri-ilmenite solid solutions: implications for magnetic self-reversal and exchange bias - III. Magnetic interactions in samples produced by Fe-Ti orderingnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionpublishedVersionnb_NO
dc.source.pagenumber1025-1047nb_NO
dc.source.volume191nb_NO
dc.source.journalGeophysical Journal Internationalnb_NO
dc.source.issue3nb_NO
dc.identifier.doi10.1111/j.1365-246X.2012.05692.x
dc.identifier.cristin958955
dc.description.localcode© 2012 The Authors. Geophysical Journal International © 2012 RAS.Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.nb_NO
cristin.unitcode194,64,90,0
cristin.unitnameInstitutt for geovitenskap og petroleum
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2


Tilhørende fil(er)

Thumbnail

Denne innførselen finnes i følgende samling(er)

Vis enkel innførsel