High-temperature ferromagnetism in Si:Mn alloys

13 páginas, 3 figuras.-- PACS number(s): 75.50.Pp, 75.50.Cc, 75.75.−c

Detalles Bibliográficos
Autores: Men'shov, V. N., Tugushev, V. V., Caprara, S., Chulkov, Eugene V.
Tipo de recurso: artículo
Fecha de publicación:2011
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/44082
Acceso en línea:http://hdl.handle.net/10261/44082
Access Level:acceso abierto
id ES_42ffd3fdd6c879a7e71b2a6593e799a0
oai_identifier_str oai:digital.csic.es:10261/44082
network_acronym_str ES
network_name_str España
repository_id_str
spelling High-temperature ferromagnetism in Si:Mn alloysMen'shov, V. N.Tugushev, V. V.Caprara, S.Chulkov, Eugene V.13 páginas, 3 figuras.-- PACS number(s): 75.50.Pp, 75.50.Cc, 75.75.−cA possible mechanism for high-temperature ferromagnetic order in Si:Mn alloys is proposed. These materials, which are semiconducting or metallic, depending on the Mn content, are suggested to undergo phase separation. In the phase-separated state, again depending on the Mn content, Mn atoms can be gathered within nanometer-sized particles or micrometer-sized islands composed of the MnSi2-z precipitate with z≈(0.25–0.30), which are embedded in the Mn-poor silicon matrix. We consider the MnSi2-z precipitate to be the MnSi1.7 silicide host containing a certain amount of magnetic defects associated with unbound Mn 3d orbitals. The MnSi1.7 silicide is considered to be a weak itinerant ferromagnet, where sizable spin fluctuations (paramagnons) exist far above its intrinsic Curie temperature, leading to a strong enhancement of the exchange coupling between the local moments of the defects. As a result, a significant enhancement of the temperature of onset of long-range order among the local moments may be achieved. We associate this temperature with the global Curie temperature of the precipitate. A phenomenological model is developed to determine the spatial structures and characteristics of ferromagnetic order for the cases of a bulk precipitate and of precipitate particles of various shapes. Moreover, allowing for the presence of strong quenched disorder in the precipitate, we describe short-range ferromagnetic order in the system. Experimental data on Si:Mn alloys are interpreted on the basis of our theoretical results.The work was partially supported by the University of the Basque Country (Proyecto GV UPV/EHU Grant No. IT-366-07), the Spanish Ministerio de Ciencia y Tecnologia (Grant No. FIS2007-66711-C02-01), and the RFBR (Grant No. 10-02-00118). SC also acknowledges financial support by PRIN 2007 under Project No. 2007FW3MJX003. VVT acknowledges financial support by Ikerbasque (Basque Foundation for Science).Peer reviewedAmerican Physical Society201220122011info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/44082reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1103/PhysRevB.83.035201info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/440822026-05-22T06:33:51Z
dc.title.none.fl_str_mv High-temperature ferromagnetism in Si:Mn alloys
title High-temperature ferromagnetism in Si:Mn alloys
spellingShingle High-temperature ferromagnetism in Si:Mn alloys
Men'shov, V. N.
title_short High-temperature ferromagnetism in Si:Mn alloys
title_full High-temperature ferromagnetism in Si:Mn alloys
title_fullStr High-temperature ferromagnetism in Si:Mn alloys
title_full_unstemmed High-temperature ferromagnetism in Si:Mn alloys
title_sort High-temperature ferromagnetism in Si:Mn alloys
dc.creator.none.fl_str_mv Men'shov, V. N.
Tugushev, V. V.
Caprara, S.
Chulkov, Eugene V.
author Men'shov, V. N.
author_facet Men'shov, V. N.
Tugushev, V. V.
Caprara, S.
Chulkov, Eugene V.
author_role author
author2 Tugushev, V. V.
Caprara, S.
Chulkov, Eugene V.
author2_role author
author
author
description 13 páginas, 3 figuras.-- PACS number(s): 75.50.Pp, 75.50.Cc, 75.75.−c
publishDate 2011
dc.date.none.fl_str_mv 2011
2012
2012
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/44082
url http://hdl.handle.net/10261/44082
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1103/PhysRevB.83.035201
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv American Physical Society
publisher.none.fl_str_mv American Physical Society
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869406993434804224
score 15.812429

Similares en LA Referencia