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

Research output: Contribution to journalArticlepeer-review

23 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

Bibliographical note

Funding Information:
This work was financially supported by National Creative Research Initiative (2010-0018300), Korea-Taiwan Cooperation Program (0409-20150111), and Global R&D Center (2016K1A4A3914691) and Institute for Basic Science (IBSR026-D1) through the NRF of Korea funded by the Ministry of Science, ICT, and Future Planning.

Publisher Copyright:
© 2016 American Chemical Society.

All Science Journal Classification (ASJC) codes

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

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