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THz spintronics is an emergent area of research aimed at bridging the gap between fifth- and sixth-generation wireless telecommunications by utilizing spintronic devices such as magnetic spin torque oscillators as a source of low powered THz emission. The realization of such devices using ferromagnetic metal thin films requires magnetic materials with both large perpendicular magnetic anisotropy (PMA) and low Gilbert damping constants. In this Letter, we report on the development of L10-ordered FePt with an effective Gilbert damping constant as low as 0.033. Using time-resolved magneto-optical Kerr effect, we characterized the magnetization dynamics of continuous L10-ordered FePt grown on MgO and SrTiO3 substrates. We found that fewer misfits and improved ordering in FePt lead to a reduced Gilbert damping constant due to reduced electron scattering but that FePt grown on SrTiO3 also shows robust perpendicular magnetic anisotropy.

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• In Copyright
  

  This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in P. D. Bentley, Y. Sasaki, I. Suzuki, S. Isogami, Y. K. Takahashi, H. Suto; Development of L1₀-ordered FePt with low damping and large perpendicular magnetic anisotropy by engineering the nanostructure. Appl. Phys. Lett. 13 January 2025; 126 (2): 022404 and may be found at https://doi.org/10.1063/5.0246369.

Keyword: FePt, spin dynamics, terahertz spintronics, magnetic metal thin film

Date published: 2025-01-13

Publisher: AIP Publishing

Journal:

• Applied Physics Letters (ISSN: 00036951) vol. 126 issue. 2

Funding:

• Core Research for Evolutional Science and Technology JPMJC22C3
• Ministry of Education, Culture, Sports, Science and Technology JPMXS0320230032
• Japan Society for the Promotion of Science JP21K14218
• Japan Society for the Promotion of Science JP18H03787

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5249

First published URL: https://doi.org/10.1063/5.0246369

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Updated at: 2025-02-06 16:30:07 +0900

Published on MDR: 2025-02-06 16:30:08 +0900