2023年第70回応用物理学会春季学術講演会

講演情報

一般セッション(口頭講演)

10 スピントロニクス・マグネティクス » 10.1 新物質・新機能創成(作製・評価技術)

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

2023年3月15日(水) 15:45 〜 18:00 D704 (11号館)

塩貝 純一(阪大)、小山 知弘(阪大)

16:30 〜 16:45

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

Hiro Munekata1,2、Nicholas W. Smith1、Yannick Pleimling1、Brenden A. Magill1、Rathsara R. Herath Mudiyanselage1、Shunta Ogawa2、Nozomi Nishizawa2,3、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.