skip to main content

SciTech ConnectSciTech Connect

Title: Morphology and magnetic flux distribution in superparamagnetic, single-crystalline Fe{sub 3}O{sub 4} nanoparticle rings

This study reports on the correlation between crystal orientation and magnetic flux distribution of Fe{sub 3}O{sub 4} nanoparticles in the form of self-assembled rings. High-resolution transmission electron microscopy demonstrated that the nanoparticles were single-crystalline, highly monodispersed, (25 nm average diameter), and showed no appreciable lattice imperfections such as twins or stacking faults. Electron holography studies of these superparamagnetic nanoparticle rings indicated significant fluctuations in the magnetic flux lines, consistent with variations in the magnetocrystalline anisotropy of the nanoparticles. The observations provide useful information for a deeper understanding of the micromagnetics of ultrasmall nanoparticles, where the magnetic dipolar interaction competes with the magnetic anisotropy.
Authors:
 [1] ; ;  [1] ;  [2] ;  [3] ;  [4] ;  [2] ;  [4] ;  [5] ;  [6] ;  [7]
  1. Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577 (Japan)
  2. (Japan)
  3. Hitachi High-Technologies Corporation, 1040 Ichige, Hitachinaka-shi, Ibaraki 312-0033 (Japan)
  4. Center for Emergent Matter Science, RIKEN, Wako 351-0198 (Japan)
  5. (Korea, Republic of)
  6. LodeSpin Labs, P.O. Box 95632, Seattle, Washington 91845 (United States)
  7. Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195-2120 (United States)
Publication Date:
OSTI Identifier:
22310711
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 18; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; ANISOTROPY; CORRELATIONS; DEFECTS; DISTRIBUTION; ELECTRONS; FLUCTUATIONS; HOLOGRAPHY; INTERACTIONS; IRON OXIDES; MAGNETIC FLUX; MAGNETIC PROPERTIES; MONOCRYSTALS; NANOPARTICLES; RESOLUTION; STACKING FAULTS; SUPERPARAMAGNETISM; TRANSMISSION ELECTRON MICROSCOPY