Photo-excited magnetization precession in Co/Pd multilayer films for developing non-thermal magnetic switching

Nicholas W. G. Smith; Yannick Pleimling; Brenden A. Magill; Rathsara R. H. H. Mudiyanselage; Alex Shenenberger; Shunta Ogawa; Nozomi Nishizawa; Hiro Munekata; Giti A. Khodaparast

doi:10.1117/12.3028879

4 October 2024 Photo-excited magnetization precession in Co/Pd multilayer films for developing non-thermal magnetic switching

Nicholas W. G. Smith, Yannick Pleimling, Brenden A. Magill, Rathsara R. H. H. Mudiyanselage, Alex Shenenberger, Shunta Ogawa, Nozomi Nishizawa, Hiro Munekata, Giti A. Khodaparast

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Proceedings Volume PC13119, Spintronics XVII; PC131191Z (2024) https://doi.org/10.1117/12.3028879
Event: Nanoscience + Engineering, 2024, San Diego, California, United States

Abstract

Ultrafast optical control of electron spin is an exciting method for writing magnetic memory with write times on the order of hundreds of femtoseconds. However, most ultrafast optical writing of magnetization has been conducted with high laser fluence (⪆ 1 mJ/cm²) which leads to excessive heating required for deterministic high-power magnetization switching. We present time-resolved magneto-optical Kerr effect observations with laser fluence 1000 times lower than previous studies, to demonstrate low-power optical control of spin in Co/Pd ultrathin multilayers. We observe clear trends between the ferromagnetic layer thickness and significant enhancement in the amplitude of optically excited magnetization precession, and demonstrate the importance of large perpendicular magnetic anisotropy for achieving high sensitivity of electron spin to low power optical excitation. Lastly, we observe a magnetization precession cone angle double of those previously reported which is an important step to achieve a 90-degree precession angle, needed for magnetization switching.

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Nicholas W. G. Smith, Yannick Pleimling, Brenden A. Magill, Rathsara R. H. H. Mudiyanselage, Alex Shenenberger, Shunta Ogawa, Nozomi Nishizawa, Hiro Munekata, and Giti A. Khodaparast "Photo-excited magnetization precession in Co/Pd multilayer films for developing non-thermal magnetic switching", Proc. SPIE PC13119, Spintronics XVII, PC131191Z (4 October 2024); https://doi.org/10.1117/12.3028879

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KEYWORDS

Magnetism

Multilayers

Switching

Anisotropy

Scientific research

Ultrafast phenomena

Kerr effect

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