Skip to main content

Shape Anisotropy, Exchange‐Coupling Interaction and Microwave Absorption of Hard/Soft Nanocomposite Ferrite Microfibers

Buy Article:

$51.00 plus tax (Refund Policy)

Abstract:

The nanocomposite BaFe12O19 (BFO)/Ni0.5Zn0.5Fe2O4 (NZFO)‐aligned microfibers with diameters 0.8–2 μm and high aspect ratios have been prepared by the gel precursor transformation process, where BFO is the hard magnetic phase and NZFO the soft magnetic phase. The nanocomposite binary ferrites are formed after the gel precursor calcined at 1000°C for 3 h. These nanocomposite aligned microfibers exhibit a clear shape anisotropy. Their magnetic difference observed at 297 and 77 K largely arises from the competition of exchange‐coupling interaction and thermal fluctuation on dipolar interaction. Consequently, their microwave absorption performance is largely influenced by the mass ratio of BFO/NZFO and specimen thickness. When the mass ratio (BFO:NZFO) is 7:3 and the specimen thickness is 3 mm, the minimum reflection loss (RL) reaches the optimized RL value of −35.5 dB at 12.4 GHz, with a wide absorption bandwidth (the RL value over −20 dB) from 9.1 to 15.7 GHz, which covers 80% of X‐band (8.2–12.4 GHz) and 59% of Ku‐band (12.4–18.0 GHz). This improvement in microwave absorption can be attributed to the exchange‐coupling interaction, shape anisotropy, interfacial polarization, and small size effect in nanocomposite microfibers.

Document Type: Research Article

DOI: https://doi.org/10.1111/j.1551-2916.2012.05375.x

Publication date: 2012-12-01

  • Access Key
  • Free ContentFree content
  • Partial Free ContentPartial Free content
  • New ContentNew content
  • Open Access ContentOpen access content
  • Partial Open Access ContentPartial Open access content
  • Subscribed ContentSubscribed content
  • Partial Subscribed ContentPartial Subscribed content
  • Free Trial ContentFree trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more