Kats Vladimir N, Shelukhin Leonid A, Usachev Pavel A, Averyanov Dmitry V, Karateev Igor A, Parfenov Oleg E, Taldenkov Alexander N, Tokmachev Andrey M, Storchak Vyacheslav G, Pavlov Victor V
Ioffe Institute, 194021 St. Petersburg, Russia.
National Research Center "Kurchatov Institute", Kurchatov Sq. 1, Moscow 123182, Russia.
Nanoscale. 2023 Feb 9;15(6):2828-2836. doi: 10.1039/d2nr04872h.
Light-induced magnetization response unfolding on a temporal scale down to femtoseconds presents a way to convey information spin manipulation. The advancement of the field requires exploration of new materials implementing various mechanisms for ultrafast magnetization dynamics. Here, pump-probe measurements of EuO-based ferromagnets by a time-resolved two-colour stroboscopic technique are reported. Epitaxial films of the pristine semiconductor and metallic Gd-doped EuO demonstrate photo-induced magnetization precession. Comparative experimental studies of both systems are carried out varying temperature, magnetic field, and polarization light helicity of the pump beam, followed by numerical estimates. The study establishes optical spin orientation by the electronic transition 4f5d → 4f5d as a mechanism triggering collective magnetization precession in these materials. The results suggest applications of EuO-based systems in optoelectronics and spintronics.
在飞秒级的时间尺度上展开的光致磁化响应为自旋操控信息传递提供了一种途径。该领域的发展需要探索实施超快磁化动力学各种机制的新材料。在此，报道了通过时间分辨双色频闪技术对基于EuO的铁磁体进行的泵浦-探测测量。原始半导体和金属Gd掺杂EuO的外延薄膜表现出光致磁化进动。对这两个系统进行了比较实验研究，改变温度、磁场和泵浦光束的偏振光螺旋度，随后进行了数值估计。该研究确定了由电子跃迁4f5d→4f5d引起的光学自旋取向是触发这些材料中集体磁化进动的一种机制。结果表明基于EuO的系统在光电子学和自旋电子学中的应用。
