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dc.contributor.authorZhang, Bei
dc.contributor.authorDu, Jun
dc.contributor.authorZheng, Rongkun
dc.contributor.authorZhang, Xixiang
dc.date.accessioned2015-08-04T07:05:01Z
dc.date.available2015-08-04T07:05:01Z
dc.date.issued2012-09-01
dc.identifier.issn15461955
dc.identifier.doi10.1166/jctn.2012.2168
dc.identifier.urihttp://hdl.handle.net/10754/564607
dc.description.abstractIt is a common understanding that the dipole-dipole interaction among the magnetic nanoparticles may result in a low-temperature spin-glass phase, which has been evidenced by observation of aging effect and memory effect. However, several studies on the nano-particles systems showed that some of the observed spin-glass-like phenomena could be due to the existence of spin-glasslike shells surrounding the ferrimagnetic cores. Therefore, it is very important to understand that how the dipole-dipole interaction induce the spin-glass phase. In order to address this issue, we have fabricated Co-SiO 2 and Fe-SiO 2 nano-granular thin films and measured the memory effect for them. Spin-glass-like phase has been observed at low temperatures. We found that, after annealing, the size of the clusters increased significantly. Based on a simple model, the dipole-dipole interaction between the clusters must be increased accordingly for the annealed samples. Interestingly, the memory effect is greatly weakened in the annealed films, which strongly suggested that the dipole-dipole interaction may not be the major factor for the formation of the low-temperature spin-glass-like phase. Copyright © 2012 American Scientific Publishers All rights reserved.
dc.publisherAmerican Scientific Publishers
dc.subjectGranular
dc.subjectInteraction
dc.subjectMagnetic
dc.subjectNano particles
dc.subjectSpin glass
dc.subjectThin film
dc.titleLow temperature spin-glass-like phases in magnetic nano-granular composites
dc.typeArticle
dc.contributor.departmentAdvanced Nanofabrication, Imaging and Characterization Core Lab
dc.contributor.departmentCore Labs
dc.contributor.departmentImaging and Characterization Core Lab
dc.contributor.departmentMaterial Science and Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalJournal of Computational and Theoretical Nanoscience
dc.contributor.institutionDepartment of Physics, Institute of Nanoscience and Technology, Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong, Hong Kong
dc.contributor.institutionDepartment of Physics, Nanjing University, Nanjing 210093, China
dc.contributor.institutionAustralia Key Center for Microscopy and Microanalysis, University of Sydney, Sydney, NSW 2006, Australia
kaust.personZhang, Bei
kaust.personZhang, Xixiang


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