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나노의학 연구단
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Quantitative Measurements of Size-Dependent Magnetoelectric Coupling in Fe3O4 Nanoparticles

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Title
Quantitative Measurements of Size-Dependent Magnetoelectric Coupling in Fe3O4 Nanoparticles
Author(s)
Kyongjun Yoo; Byung-Gu Jeon; Sae Hwan Chun; Deepak Rajaram Patil; Yongjun Lim; Seung-hyun Noh; Jihyo Gil; Jinwoo Cheon; Kee Hoon Kim
Publication Date
2016-12
Journal
NANO LETTERS, v.16, no.12, pp.7408 - 7413
Publisher
AMER CHEMICAL SOC
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. © 2016 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/3166
ISSN
1530-6984
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Center for Nanomedicine (나노의학 연구단) > Journal Papers
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