Low temperature spin-glass-like phases in magnetic nano-granular composites

Handle URI:
http://hdl.handle.net/10754/564607
Title:
Low temperature spin-glass-like phases in magnetic nano-granular composites
Authors:
Zhang, Bei; Du, Jun; Zheng, Rongkun; Zhang, Xixiang ( 0000-0002-3478-6414 )
Abstract:
It 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.
KAUST Department:
Advanced Nanofabrication, Imaging and Characterization Core Lab; Physical Sciences and Engineering (PSE) Division; Materials Science and Engineering Program; Core Labs
Publisher:
American Scientific Publishers
Journal:
Journal of Computational and Theoretical Nanoscience
Issue Date:
1-Sep-2012
DOI:
10.1166/jctn.2012.2168
Type:
Article
ISSN:
15461955
Appears in Collections:
Articles; Advanced Nanofabrication, Imaging and Characterization Core Lab; Physical Sciences and Engineering (PSE) Division; Materials Science and Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorZhang, Beien
dc.contributor.authorDu, Junen
dc.contributor.authorZheng, Rongkunen
dc.contributor.authorZhang, Xixiangen
dc.date.accessioned2015-08-04T07:05:01Zen
dc.date.available2015-08-04T07:05:01Zen
dc.date.issued2012-09-01en
dc.identifier.issn15461955en
dc.identifier.doi10.1166/jctn.2012.2168en
dc.identifier.urihttp://hdl.handle.net/10754/564607en
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.en
dc.publisherAmerican Scientific Publishersen
dc.subjectGranularen
dc.subjectInteractionen
dc.subjectMagneticen
dc.subjectNano particlesen
dc.subjectSpin glassen
dc.subjectThin filmen
dc.titleLow temperature spin-glass-like phases in magnetic nano-granular compositesen
dc.typeArticleen
dc.contributor.departmentAdvanced Nanofabrication, Imaging and Characterization Core Laben
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentMaterials Science and Engineering Programen
dc.contributor.departmentCore Labsen
dc.identifier.journalJournal of Computational and Theoretical Nanoscienceen
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 Kongen
dc.contributor.institutionDepartment of Physics, Nanjing University, Nanjing 210093, Chinaen
dc.contributor.institutionAustralia Key Center for Microscopy and Microanalysis, University of Sydney, Sydney, NSW 2006, Australiaen
kaust.authorZhang, Beien
kaust.authorZhang, Xixiangen
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