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Disorder-induced antiferromagnetic to ferromagnetic transition in magneticoverlayers: (Fe,Mn)/W(001) as a case study
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SYSNO ASEP 0357426 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Ostatní články Název Disorder-induced antiferromagnetic to ferromagnetic transition in magneticoverlayers: (Fe,Mn)/W(001) as a case study Tvůrce(i) Kudrnovský, Josef (FZU-D) RID, ORCID
Ondráček, Martin (FZU-D) RID, ORCID
Bengone, O. (FR)
Máca, František (FZU-D) RID, ORCIDZdroj.dok. e-Journal of Surface Science and Nanotechnology - ISSN 1348-0391
Roč. 8, - (2010), s. 184-189Poč.str. 6 s. Jazyk dok. eng - angličtina Země vyd. JP - Japonsko Klíč. slova ab initio calculations ; Green’s function methods ; construction of effective interatomic interactions ; magnetic phase transitions in overlayers Vědní obor RIV BM - Fyzika pevných látek a magnetismus CEP GA202/07/0456 GA ČR - Grantová agentura ČR OC09028 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy GA202/09/0775 GA ČR - Grantová agentura ČR CEZ AV0Z10100520 - FZU-D (2005-2011) AV0Z10100521 - FZU-D (2005-2011) DOI 10.1380/ejssnt.2010.184 Anotace The magnetic phase stability of the random FexMn1-x monolayer on the bcc-W(001) substrate is studied from first-principles. The exchange interactions among two-types of magnetic atoms in the overlayer are estimated and used to construct the random classical two-dimensional Heisenberg Hamiltonian. The stability of such effective Hamiltonian is then studied with respect to a broad class of magnetic arrangements which include also possible spin-spiral structures. We have found that exchange interactions between Fe-spin are antiferromagnetic while those between Mn-spins are ferromagnetic over the whole concentration range. This pronounced frustration leads to a complex behavior in which the c(2x2) antiferromagnetic state for Fe-monolayer goes over to complex incommensurate spin-spiral magnetic structures with increasing Mn-content. A spin-spiral state with a large period was found also for the Mn-monolayer case in agreement with a recent experiment. Pracoviště Fyzikální ústav Kontakt Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Rok sběru 2011
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