Quantitative measurements of size-dependent magnetoelectric coupling in Fe3O4 nanoparticles
| Autor: | Yoo, Kyongjun, Jeon, Byung-Gu, Chun, Sae Hwan, Patil, Deepak Rajaram, Lim, Yong-jun, Noh, Seung-hyun, Gil, Jihyo, Cheon, Jinwoo, Kim, Kee Hoon |
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| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Nano Letters 16, 12 (2016) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1021/acs.nanolett.6b02978 |
| Popis: | 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. Comment: 19 pages, 4 figures |
| Databáze: | arXiv |
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