Magnetoelectric Control of Superparamagnetism
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- 作者：Hyungsuk K. D. Kim ; Laura T. Schelhas ; Scott Keller ; Joshua L. Hockel ; Sarah H. Tolbert ; Gregory P. Carman
- 刊名：Nano Letters
- 出版年：2013
- 出版时间：March 13, 2013
- 年：2013
- 卷：13
- 期：3
- 页码：884-888
- 全文大小：313K
- 年卷期：v.13,no.3(March 13, 2013)
- ISSN：1530-6992
文摘
Here we demonstrate electric-field induced magnetic anisotropy in a multiferroic composite containing nickel nanocrystals strain coupled to a piezoelectric substrate. This system can be switched between a superparamagnetic state and a single-domain ferromagnetic state at room temperature. The nanocrystals show a shift in the blocking temperature of 40 K upon electric poling. We believe this is the first example of a system where an electric field can be used to switch on and off a permanent magnetic moment.