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dc.contributor.author김태희-
dc.date.accessioned2017-08-28T22:35:32Z-
dc.date.available2017-08-28T22:35:32Z-
dc.date.issued2012-
dc.identifier.issn1530-6984-
dc.identifier.otherOAK-8564-
dc.identifier.urihttp://dspace.ewha.ac.kr/handle/2015.oak/222449-
dc.description.abstractA precise control and understanding of the magnetization dynamics of nanostructures is an important topic in applied nanosciences. Herein, we perform such control by annealing crystalline (Co/core)-(Pt/shell) nanoparticles. Using electron tomography, temperature dependent electron microscopy and time-resolved magneto-optics, we establish a clear correlation between the magnetization dynamics and the crystalline structure of the nanoparticles. For a mild laser annealing (370 K) the Co-Pt nanoparticles keep their core-shell structure and remain superparamagnetic with a blocking temperature T B = 66 K. Their time-resolved reflectivity shows that they are locally organized into a supra-crystalline ordered layer in the region of the laser spot. In contrast, a thermal annealing at higher temperatures (up to 700 K) modifies the structure of the individual nanoparticles into a CoPt crystalline ferromagnetic phase, with T B,anneal = 347 K. Correspondingly, the magneto-crystalline anisotropy of the annealed CoPt nanoparticles increases and their magnetization dynamics displays a motion of precession, characteristic of ferromagnetic nanostructures and which is absent in the superparamagnetic Co-Pt core-shells. © 2012 American Chemical Society.-
dc.languageEnglish-
dc.titleMagnetic properties of annealed core-shell CoPt nanoparticles-
dc.typeArticle-
dc.relation.issue3-
dc.relation.volume12-
dc.relation.indexSCI-
dc.relation.indexSCIE-
dc.relation.indexSCOPUS-
dc.relation.startpage1189-
dc.relation.lastpage1197-
dc.relation.journaltitleNano Letters-
dc.identifier.doi10.1021/nl300306a-
dc.identifier.wosidWOS:000301406800013-
dc.identifier.scopusid2-s2.0-84858255108-
dc.author.googleBigot J.-Y.-
dc.author.googleKesserwan H.-
dc.author.googleHalte V.-
dc.author.googleErsen O.-
dc.author.googleMoldovan M.S.-
dc.author.googleKim T.H.-
dc.author.googleJang J.-T.-
dc.author.googleCheon J.-
dc.contributor.scopusid김태희(56036518200)-
dc.date.modifydate20170605103615-
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자연과학대학 > 물리학전공 > Journal papers
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