Quantitative Measurements of Size-Dependent Magnetoelectric Coupling in Fe3O4 Nanoparticles

Kyongjun Yoo, Byung Gu Jeon, Sae Hwan Chun, Deepak Rajaram Patil, Yong Jun Lim, Seung Hyun Noh, Jihyo Gil, Jinwoo Cheon, Kee Hoon Kim

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16 Citations (Scopus)

Abstract

Bulk magnetite (Fe3O4), the loadstone used in magnetic compasses, has been known to exhibit magnetoelectric (ME) properties below ∼10 K; however, corresponding ME effects in Fe3O4 nanoparticles have been enigmatic. We investigate quantitatively the ME coupling of spherical Fe3O4 nanoparticles with uniform diameters (d) from 3 to 15 nm embedded in an insulating host, using a sensitive ME susceptometer. The intrinsic ME susceptibility (MES) of the Fe3O4 nanoparticles is measured, exhibiting a maximum value of ∼0.6 ps/m at 5 K for d = 15 nm. We found that the MES is reduced with reduced d but remains finite until d = ∼5 nm, which is close to the critical thickness for observing the Verwey transition. Moreover, with reduced diameter the critical temperature below which the MES becomes conspicuous increased systematically from 9.8 K in the bulk to 19.7 K in the nanoparticles with d = 7 nm, reflecting the core-shell effect on the ME properties. These results point to a new pathway for investigating ME effect in various nanomaterials.

Original languageEnglish
Pages (from-to)7408-7413
Number of pages6
JournalNano letters
Volume16
Issue number12
DOIs
Publication statusPublished - 2016 Dec 14

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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    Yoo, K., Jeon, B. G., Chun, S. H., Patil, D. R., Lim, Y. J., Noh, S. H., Gil, J., Cheon, J., & Kim, K. H. (2016). Quantitative Measurements of Size-Dependent Magnetoelectric Coupling in Fe3O4 Nanoparticles. Nano letters, 16(12), 7408-7413. https://doi.org/10.1021/acs.nanolett.6b02978