Zhu Dapeng, Cao Qiang, Qiao Ruimin, Zhu Shimeng, Yang Wanli, Xia Weixing, Tian Yufeng, Liu Guolei, Yan Shishen
School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, P. R. China.
Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
Sci Rep. 2016 Apr 11;6:24188. doi: 10.1038/srep24188.
High quality single-crystal fcc-Co(x)(Mg(y)Zn(1-y))(1-x)O(1-v) epitaxial thin films with high Co concentration up to x = 0.5 have been fabricated by molecular beam epitaxy. Systematic magnetic property characterization and soft X-ray absorption spectroscopy analysis indicate that the coexistence of ferromagnetic regions, superparamagnetic clusters, and non-magnetic boundaries in the as-prepared Co(x)(Mg(y)Zn(1-y))(1-x)O(1-v) films is a consequence of the intrinsic inhomogeneous distribution of oxygen vacancies. Furthermore, the relative strength of multiple phases could be modulated by controlling the oxygen partial pressure during sample preparation. Armed with both controllable magnetic properties and tunable band-gap, Co(x)(Mg(y)Zn(1-y))(1-x)O(1-v) films may have promising applications in future spintronics.
通过分子束外延制备了高质量的单晶面心立方结构的Co(x)(Mg(y)Zn(1-y))(1-x)O(1-v)外延薄膜，其中Co浓度高达x = 0.5。系统的磁性表征和软X射线吸收光谱分析表明，在制备的Co(x)(Mg(y)Zn(1-y))(1-x)O(1-v)薄膜中，铁磁区域、超顺磁簇和非磁性边界的共存是氧空位固有不均匀分布的结果。此外，通过控制样品制备过程中的氧分压，可以调节多相的相对强度。由于具有可控的磁性和可调的带隙，Co(x)(Mg(y)Zn(1-y))(1-x)O(1-v)薄膜在未来的自旋电子学中可能具有广阔的应用前景。
