000117667 001__ 117667
000117667 005__ 20230622083332.0
000117667 0247_ $$2doi$$a10.3390/applnano1010007
000117667 0248_ $$2sideral$$a129075
000117667 037__ $$aART-2020-129075
000117667 041__ $$aeng
000117667 100__ $$aSoler-Morala, J.
000117667 245__ $$aSpontaneous Formation of Core@shell Co@Cr Nanoparticles by Gas Phase Synthesis
000117667 260__ $$c2020
000117667 5060_ $$aAccess copy available to the general public$$fUnrestricted
000117667 5203_ $$aThis work presents the gas phase synthesis of CoCr nanoparticles using a magnetron-based gas aggregation source. The effect of the particle size and Co/Cr ratio on the properties of the nanoparticles is investigated. In particular, we report the synthesis of nanoparticles from two alloy targets, Co90Cr10 and Co80Cr20. In the first case, we observe a size threshold for the spontaneous formation of a segregated core@shell structure, related to the surface to volume ratio. When this ratio is above one, a shell cannot be properly formed, whereas when this ratio decreases below unity the proportion of Cr atoms is high enough to allow the formation of a shell. In the latter case, the segregation of the Cr atoms towards the surface gives rise to the formation of a shell surrounding the Co core. When the proportion of Cr is increased in the target (Co80Cr20), a thicker shell is spontaneously formed for a similar nanoparticle size. The magnetic response was evaluated, and the influence of the structure and composition of the nanoparticles is discussed. An enhancement of the global magnetic anisotropy caused by exchange bias and dipolar interactions, which enables the thermal stability of the studied small particles up to relatively large temperatures, is reported.
000117667 536__ $$9info:eu-repo/grantAgreement/ES/MINECO/MAT2015-65295-R$$9info:eu-repo/grantAgreement/ES/MINECO/FIS2016-76058-C4-1-R$$9info:eu-repo/grantAgreement/ES/MICINN/RYC-2018-024561-I
000117667 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttp://creativecommons.org/licenses/by/3.0/es/
000117667 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000117667 700__ $$aJefremovas, E. M.
000117667 700__ $$aMartínez, L.
000117667 700__ $$0(orcid)0000-0002-5229-2717$$aMayoral, A.$$uUniversidad de Zaragoza
000117667 700__ $$aSánchez, E. H.
000117667 700__ $$aDe Toro, J. A.
000117667 700__ $$aNavarro, E.
000117667 700__ $$aHuttel, Y.
000117667 7102_ $$12003$$2395$$aUniversidad de Zaragoza$$bDpto. Física Materia Condensa.$$cÁrea Física Materia Condensada
000117667 773__ $$g1, 1 (2020), 87-101$$pAppl. Nano$$tApplied Nano$$x2673-3501
000117667 8564_ $$s5675548$$uhttps://zaguan.unizar.es/record/117667/files/texto_completo.pdf$$yVersión publicada
000117667 8564_ $$s2430389$$uhttps://zaguan.unizar.es/record/117667/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000117667 909CO $$ooai:zaguan.unizar.es:117667$$particulos$$pdriver
000117667 951__ $$a2023-06-21-15:03:53
000117667 980__ $$aARTICLE