Emerging 2D-ferromagnetism and strong spin-orbit coupling at the surface of valence-fluctuating EuIr2Si2
Emerging 2D-ferromagnetism and strong spin-orbit coupling at the surface of valence-fluctuating EuIr2Si2
复制标题
价态涨落的 EuIr2Si2 表面出现的二维铁磁性和强自旋轨道耦合
DOI：
10.1038/s41535-019-0166-z
复制
发表时间：
2019
影响因子：
5.7
通讯作者：
D. Vyalikh
中科院分区：
文献类型：
--
作者：
S. Schulz;I. A. Nechaev;M. Güttler;G. Poelchen;A. Generalov;S. Danzenbächer;A. Chikina;S. Seiro;K. Kliemt;A. Vyazovskaya;Timur K. Kim;P. Dudin;E. Chulkov;C. Laubschat;E. Krasovskii;C. Geibel;C. Krellner;K. Kummer;D. Vyalikh
开发本体无磁性但表面呈现二维 (2D) 磁性的材料是自旋电子学应用的核心。在这里，我们提出了价态波动材料 EuIr2Si2，与其非磁性体相比，Si 端接表面显示出可控的二维铁磁性。靠近表面，Eu 离子更喜欢磁性二价构型，其大 4f 矩阶数低于 48 K。新兴的交换相互作用改变了最初由强 Rashba 效应引起的二维表面电子的自旋极化。块体的温度依赖性混合价可以调节二维电子所限制的投影带隙的能量和动量大小。这为处理表面的自旋极化电子提供了额外的自由度。我们的研究结果表明，价态波动的稀土基材料是开发具有可控二维磁特性的系统的非常有前景的基础，这对于基础科学和应用都很有意义。
The development of materials that are non-magnetic in the bulk but exhibit two-dimensional (2D) magnetism at the surface is at the core of spintronics applications. Here, we present the valence-fluctuating material EuIr2Si2, where in contrast to its non-magnetic bulk, the Si-terminated surface reveals controllable 2D ferromagnetism. Close to the surface the Eu ions prefer a magnetic divalent configuration and their large 4f moments order below 48 K. The emerging exchange interaction modifies the spin polarization of the 2D surface electrons originally induced by the strong Rashba effect. The temperature-dependent mixed valence of the bulk allows to tune the energy and momentum size of the projected band gaps to which the 2D electrons are confined. This gives an additional degree of freedom to handle spin-polarized electrons at the surface. Our findings disclose valence-fluctuating rare-earth based materials as a very promising basis for the development of systems with controllable 2D magnetic properties which is of interest both for fundamental science and applications.
影响因子：
16.6
作者：
A. Chikina;M. Höppner;S. Seiro;K. Kummer;S. Danzenbächer;Swapnil Patil;A. Generalov;M. Güttler-
通讯作者：
A. Chikina;M. Höppner;S. Seiro;K. Kummer;S. Danzenbächer;Swapnil Patil;A. Generalov;M. Güttler-
影响因子：
12.5
作者：
Kummer, K.;Patil, S.;Vyalikh, D. V.
通讯作者：
Vyalikh, D. V.
影响因子：
10.8
作者：
A. Generalov;M. Otrokov;A. Chikina;K. Kliemt;K. Kummer;M. Höppner;M. Güttler;S. Seiro;A. Fedorov;S. Schulz;S. Danzenbächer;E. Chulkov;C. Geibel;C. Laubschat;P. Dudin;M. Hoesch;Timur K. Kim;M. Radović;M. Shi;N. Plumb;C. Krellner;D. Vyalikh
通讯作者：
A. Generalov;M. Otrokov;A. Chikina;K. Kliemt;K. Kummer;M. Höppner;M. Güttler;S. Seiro;A. Fedorov;S. Schulz;S. Danzenbächer;E. Chulkov;C. Geibel;C. Laubschat;P. Dudin;M. Hoesch;Timur K. Kim;M. Radović;M. Shi;N. Plumb;C. Krellner;D. Vyalikh