(111)-oriented CoFe2O4 and NiCo2O4 ultrathin films with tailored electronic and magnetic properties

具有定制电子和磁性能的 (111) 取向 CoFe2O4 和 NiCo2O4 超薄膜

基本信息

项目摘要

During the first funding period of the project "Ferrimagnetic spinels with tunable electronic and magnetic properties", ultrathin, (001)-oriented ferrite and NiCo2O4 films were characterized in detail with respect to i) structural parameters (degree of inversion of the spinel, interface, morphology, antiphase boundaries), ii) valence states of the transition metals (cationic distribution), and iii) spin state and magnetic anisotropy. As already indicated, the anticipated second period will deal with ultrathin films of the same material which, however, have an orientation different from (001). Here, the (111)-orientation is highly interesting for both CoxFe3-xO4 (x<2) and NixCo3-xO4 (x<2) ultrathin films. For example, (111)-oriented CoFe2O4 ultrathin films can exhibit higher spin polarization and coercivity than (001)-oriented CoFe2O4 ultrathin films. High magnetoresistance and semiconducting behavior have been reported for (111)-oriented NiCo2O4 ultrathin films. These properties and their dedicated characterization are indispensable to use these materials for applications in, e.g., spin polarized tunnel currents, magnetic storage media or applications in the field of electrocatalysis or battery anodes. In order to study the complex interplay between double- and super-exchange mechanisms in dependence of the exact stoichiometry, the cation distribution and above mentioned structural parameters, we will produce (111)-oriented ultrathin films by means of reactive and oxygen plasma assisted MBE to maintain control of the growth down to the unit cell scale, resulting in films of excellent structural order. Characterization of the thin films will include structural analysis by means of LEED, XRR and GI(XRD), microstructural probes of the surface (SEM, AFM) and interfaces (TEM). Electronic structure and stoichiometry will be investigated by XPS and HAXPES experiments. Complementary (temperature dependent) measurements of the electrical resistivity measurements will be also carried out. The magnetic structure will be studied globally by means of MOKE, VSM/SQUID magnetometry, and magneto resistance measurements. For selected samples, synchrotron based approaches will by employed to gain element specific information of the chemical properties (HAXPES) and the magnetic properties (XMCD). The latter will be accompanied by XRMR for a few interesting samples. The experimental results will be further analyzed and compared with suitable theoretical approaches. This way we will develop a rather complete picture of the overall properties of the above mentioned highly interesting (stoichiometric and non-stoichiometric) systems with normal, mixed, or inverse spinel structure.
在“具有可调电子和磁性的铁磁尖晶石”项目的第一个资助期内,详细表征了取向为α,(001)的铁氧体和NiCo 2 O 4薄膜的结构参数(尖晶石的反转程度、界面、形态、反相边界),ii)过渡金属的价态(阳离子分布),和iii)自旋状态和磁各向异性。如前所述,预期的第二阶段将处理同样材料但取向不同于(001)的可吸收薄膜。CoxFe_(3-x)O_4(x<2)和NixCo_(3-x)O_4(x<2)薄膜的(111)取向是非常有趣的。例如,(111)取向的CoFe 2 O 4非晶薄膜可以表现出比(001)取向的CoFe 2 O 4非晶薄膜更高的自旋极化和极化率。报道了(111)取向的NiCo_2O_4薄膜的高磁电阻和半导体特性。这些性质及其专用表征对于将这些材料用于以下应用是必不可少的,例如,自旋极化隧道电流、磁存储介质或在电催化或电池阳极领域中的应用。为了研究依赖于精确化学计量、阳离子分布和上述结构参数的双交换和超交换机制之间的复杂相互作用,我们将通过反应和氧等离子体辅助MBE来制备(111)取向的SiO2膜,以保持对生长的控制,直到晶胞尺度,从而产生具有优异结构有序性的膜。薄膜的表征将包括通过LEED,XRR和GI(XRD),表面(SEM,AFM)和界面(TEM)的微结构探针的结构分析。电子结构和化学计量将通过XPS和HAXPES实验进行研究。还将进行电阻率测量的补充(温度相关)测量。将通过MOKE,VSM/SQUID磁强计和磁阻测量对磁结构进行全球研究。对于选定的样品,同步加速器为基础的方法将被用来获得元素的具体信息的化学性质(HAXPES)和磁性(XMCD)。后者将伴随着XRMR一些有趣的样品。实验结果将进一步分析和比较合适的理论方法。这样,我们将开发一个相当完整的图片的整体性能的上述高度有趣的(化学计量和非化学计量)系统与正常,混合,或反尖晶石结构。

项目成果

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Dr. Karsten Küpper其他文献

Dr. Karsten Küpper的其他文献

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{{ truncateString('Dr. Karsten Küpper', 18)}}的其他基金

Elektronische und magnetische Struktur von Magnetit basierten Dünnschicht-Materialien
磁铁矿基薄膜材料的电子和磁结构
  • 批准号:
    201130103
  • 财政年份:
    2012
  • 资助金额:
    --
  • 项目类别:
    Research Grants

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    面上项目

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