Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | 김태희 | * |
dc.date.accessioned | 2016-08-28T12:08:04Z | - |
dc.date.available | 2016-08-28T12:08:04Z | - |
dc.date.issued | 2012 | * |
dc.identifier.issn | 1530-6984 | * |
dc.identifier.other | OAK-8564 | * |
dc.identifier.uri | https://dspace.ewha.ac.kr/handle/2015.oak/222449 | - |
dc.description.abstract | A 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.language | English | * |
dc.title | Magnetic properties of annealed core-shell CoPt nanoparticles | * |
dc.type | Article | * |
dc.relation.issue | 3 | * |
dc.relation.volume | 12 | * |
dc.relation.index | SCI | * |
dc.relation.index | SCIE | * |
dc.relation.index | SCOPUS | * |
dc.relation.startpage | 1189 | * |
dc.relation.lastpage | 1197 | * |
dc.relation.journaltitle | Nano Letters | * |
dc.identifier.doi | 10.1021/nl300306a | * |
dc.identifier.wosid | WOS:000301406800013 | * |
dc.identifier.scopusid | 2-s2.0-84858255108 | * |
dc.author.google | Bigot J.-Y. | * |
dc.author.google | Kesserwan H. | * |
dc.author.google | Halte V. | * |
dc.author.google | Ersen O. | * |
dc.author.google | Moldovan M.S. | * |
dc.author.google | Kim T.H. | * |
dc.author.google | Jang J.-T. | * |
dc.author.google | Cheon J. | * |
dc.contributor.scopusid | 김태희(57212232131) | * |
dc.date.modifydate | 20240422115658 | * |