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

Journal Article · · Advanced Functional Materials
 [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)

Quasi‐1D nanochains of spherical magnetic ferrite particles with a homogeneous particle size of ≈200 nm and a micrometer‐sized chain length are fabricated 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. 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 sites in a selective manner.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); European Commission (EC)
Grant/Contract Number:
AC02-05CH11231; 61306121; PIOF-GA-2013-628063; DE‐AC02‐05CH11231
OSTI ID:
1379918
Alternate ID(s):
OSTI ID: 1401807
Journal Information:
Advanced Functional Materials, Vol. 27, Issue 29; ISSN 1616-301X
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 19 works
Citation information provided by
Web of Science

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