Electrode processes and in situ magnetic measurements of FePt films in a LiPF6 based electrolyte
Electrode processes and in situ magnetic measurements of FePt films in a LiPF6 based electrolyte
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LiPF6 电解质中 FePt 薄膜的电极工艺和原位磁性测量
DOI：
10.1016/j.electacta.2012.07.055
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发表时间：
2012
影响因子：
6.6
通讯作者：
L. Schultz
中科院分区：
文献类型：
--
作者：
K. Leistner;N. Lange;J. Hänisch;S. Oswald;F. Scheiba;S. Fähler;H. Schlörb;L. Schultz
金属/电解质界面磁的可逆控制为多功能磁性器件提供了巨大的应用潜力。与纯金属Fe和Pt相比，本文分析了lipf6在碳酸二甲酯(DMC) -碳酸乙烯（EC）中电极-电解质的相互作用和FePt合金薄膜的充电过程。主要的电极过程是Li的沉积和溶解，Fe的溶解和再沉积，杂质和电解质的还原和氧化过程。在FePt薄膜中，Fe对阳极溶解更稳定。铂减弱电极钝化和催化杂质还原反应。这导致在没有副反应的情况下，FePt薄膜充电的阴极电位极限为1.8V vs. Li/Li+。随后，超薄结构FePt薄膜被用作电极，具有大电压感应磁表面效应。利用异常霍尔效应对充电过程中的磁性进行了原位监测。通过原位测量，可以检测到在3V以上的表面上边际Fe与Li/Li+的溶解，并限制了上充电电位。结果表明，FePt薄膜的充电电位窗口为1.2V。在此电位范围内，检测到磁矩的大可逆变化，这归因于天然氧化铁表面层的可逆氧化还原过程。
Reversible control of magnetism at the metal/electrolyte interface offers great application potential for multifunctional magnetic devices. Here, the electrode–electrolyte interactions and the charging of FePt alloy films in LiPF6in dimethyl carbonate(DMC)–ethylene carbonate (EC) are analysed in comparison to the pure metals Fe and Pt. The main electrode processes are Li deposition and dissolution, Fe dissolution and redeposition, and reduction as well as oxidation processes of impurities and electrolyte. Fe is found to be more stable against anodic dissolution in FePt films. Pt attenuates electrode passivation and catalyses impurity reduction reactions. This results in a cathodic potential limit of 1.8V vs. Li/Li+for charging FePt films without side reactions. Subsequently, ultrathin textured FePt films promising large voltage induced magnetic surface effects where used as electrodes. Magnetic properties during charging were monitored by an in situ setup based on the anomalous Hall effect. Marginal Fe dissolution at the surface above 3V vs. Li/Li+is detected by the in situ measurement and limits the upper charging potential. In consequence, a potential window of 1.2V for charging the FePt films is obtained. In this potential range a large reversible change of magnetic moment is detected, which is attributed to reversible redox processes in the native iron oxide surface layer.
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影响因子：
1.9
作者：
Ibach, H;Bach, CE;Grossmann, A
通讯作者：
Grossmann, A
影响因子：
4
作者：
Drings, Harald;Viswanath, Raghavan N.;Wuerschum, Roland
通讯作者：
Wuerschum, Roland
金属-电解质界面的表面态
DOI：
--
发表时间：
1982
期刊：
影响因子：
--
作者：
D. Kolb;C. Franke
通讯作者：
C. Franke
EQCM在碳酸丙烯酯溶液电化学行为研究中的应用
DOI：
--
发表时间：
1995
期刊：
影响因子：
--
作者：
D. Aurbach;A. Zaban
通讯作者：
A. Zaban
影响因子：
44.1
作者：
Nagaosa, Naoto;Sinova, Jairo;Ong, N. P.
通讯作者：
Ong, N. P.