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

Abstract

Bulk magnetite (Fe3O4), the loadstone used in magneticcompasses, has been known to exhibit magnetoelectric (ME) propertiesbelow-10 K;however, correspondingME effects in Fe3O4nanoparticles havebeen enigmatic.We investigate quantitatively the ME coupling ofspherical Fe3O4nanoparticleswith uniform diameters (d) from 3 to 15 nmembedded in an insulating host, usingasensitive ME susceptometer. The intrinsic ME susceptibility (MES)of the Fe3O4nanoparticlesis measured, exhibiting amaximum value of -0.6 ps/m at 5 K for d=15 nm. We found that the MESis reducedwith reduceddbut remains finite untild=-5nm, which is close to the critical thickness for observingtheVerwey 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
JournalUnknown Journal
Publication statusPublished - 2017 Sep 1

All Science Journal Classification (ASJC) codes

  • General

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