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Title: XMCD and XMCD-PEEM Studies on Magnetic-Field-Assisted Self-Assembled 1D Nanochains of Spherical Ferrite Particles

Quasi-1D nanochains of spherical magnetic ferrite particles with a homogeneous particle size of ≈200 nm and a micrometer-sized chain length are fabricated in this paper via a self-assembly method under an external magnetic field. This assisting magnetic field (H assist), applied during synthesis, significantly modifies the distribution of the Fe 2+O h, Fe 3+T d, and Fe 3+O h cations in the chains, as demonstrated by X-ray magnetic circular dichroism (XMCD) combined with theoretical analysis. This provides direct evidence of the nontrivial role of external synthetic conditions for defining the crystal chemistry of nanoscale ferrites and in turn their magnetic properties, providing an extra degree of freedom for intentional control over the performances of 1D magnetic nanodevices for various applications. Magnetic imaging, performed via XMCD in photoemission electron microscopy, further shows the possibility of creating and trapping a series of adjacent magnetic domain walls in a single chain, suggesting that there is great application potential for these nanochains in 1D magnetic nanodevices, as determined by field- or current-driven domain wall motions. Finally, practical control over the magnetic properties of the nanochains is also achieved by extrinsic dopants of cobalt and zinc, which are observed to occupy the ferrite ionic sitesmore » in a selective manner.« less
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [3] ;  [4] ;  [5] ;  [6] ;  [3] ;  [3]
  1. Southeast Univ., Nanjing (China); National Univ. of Singapore (Singapore)
  2. National Univ. of Singapore (Singapore); Univ. of Twente, Enschede (Netherlands)
  3. Southeast Univ., Nanjing (China)
  4. Diamond Light Source, Didcot (United Kingdom)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  6. Univ. of California, Irvine, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-05CH11231; 61306121; PIOF-GA-2013-628063
Type:
Accepted Manuscript
Journal Name:
Advanced Functional Materials
Additional Journal Information:
Journal Volume: 27; Journal Issue: 29; Journal ID: ISSN 1616-301X
Publisher:
Wiley
Research Org:
Southeast Univ., Nanjing (China); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Natural Science Foundation of China (NNSFC); European Commission (EC)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 1D nanochains; cation distribution; ferrites; magnetic properties; X-ray magnetic circular dichroism (XMCD)
OSTI Identifier:
1379918
Alternate Identifier(s):
OSTI ID: 1401807