标题: Deterministic, Reversible, and Nonvolatile Low-Voltage Writing of Magnetic Domains in Epitaxial BaTiO3/Fe3O4 Heterostructure
作者: Zhong, Gaokuo
An, Feng
Bitla, Yugandhar
Wang, Jinbin
Zhong, Xiangli
Yu, Junxi
Gao, Wenpei
Zhang, Yi
Tang, Congbing
Ou, Yun
Jiang, Jie
Hsieh, Ying-Hui
Pan, Xiaoqing
Xie, Shuhong
Chu, Ying-Hao
Li, Jiangyu
材料科学与工程学系
Department of Materials Science and Engineering
关键字: multiferroic heterostructure;magnetoelectric coupling;Fe3O4;low-voltage writing;oxygen vacancies
公开日期: 1-九月-2018
摘要: The ability to electrically write magnetic bits is highly desirable for future magnetic memories and spintronic devices, though fully deterministic, reversible, and nonvolatile switching of magnetic moments by electric field remains elusive despite extensive research. In this work, we develop a concept to electrically switch magnetization via polarization modulated oxygen vacancies, and we demonstrate the idea in a multiferroic epitaxial heterostructure of BaTiO3/Fe3O4 fabricated by pulsed laser deposition. The piezoelectricity and ferroelectricity of BaTiO3 have been confirmed by macro- and microscale measurements, for which Fe(3)O(4 )serves as the top electrode for switching the polarization. X-ray absorption spectroscopy and X-ray magnetic circular dichroism spectra indicate a mixture of Fe2+ and Fe3+ at O-h sites and Fe3+ at T-d sites in Fe3O4, while the room-temperature magnetic domains of Fe3O4 are revealed by microscopic magnetic force microscopy measurements. It is demonstrated that the magnetic domains of Fe(3)O(4 )can be switched by not only magnetic fields but also electric fields in a deterministic, reversible, and nonvolatile manner, wherein polarization reversal by electric field modulates the oxygen vacancy distribution in Fe3O4, and thus its magnetic state, making it attractive for electrically written magnetic memories.
URI: http://dx.doi.org/10.1021/acsnano.8b05284
http://hdl.handle.net/11536/148227
ISSN: 1936-0851
DOI: 10.1021/acsnano.8b05284
期刊: ACS NANO
Volume: 12
起始页: 9558
结束页: 9567
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