[15p-D704-1~8] 10.1 新物質・新機能創成（作製・評価技術）

▲ [15p-D704-4] Photo-excited precession of magnetization in ultra-thin Co/Pd multilayers at low laser fluence regime

〇Hiro Munekata^1,2、Nicholas W. Smith¹、Yannick Pleimling¹、Brenden A. Magill¹、Rathsara R. Herath Mudiyanselage¹、Shunta Ogawa²、Nozomi Nishizawa^2,3、Giti A. Khodaparast¹ (1.Virginia Tech、2.Tokyo Tech.、3.Kitasato Univ.)

キーワード：Magnetic multi-layers, fs-laser-pulse excitation, spin-orbit interaction

We present femtosecond-pulse-induced precession of magnetization at low laser fluence (P < 5 μJ/cm2) regime as a function of magnetic field and laser fluence in three Co/Pd multilayer (ML) systems. We discuss that the spin–orbit interaction that yields perpendicularly spin-polarized electrons in the MLs through the Co/Pd interface is responsible for the observed increase in precession amplitudes of locally excited magnetization. Our approach of employing low-fluence laser excitation of magnetization precession could be practical for developing a non-thermal, all-optical magnetic switching toward photonic memory applications.