# Fileset

[FePtSTO_Supplementary.pdf](https://mdr.nims.go.jp/filesets/3e29c92a-5c6d-4386-a805-7143f0ce9d8d/download)

## Creator

[P. D. Bentley](https://orcid.org/0000-0003-4160-2449), [Y. Sasaki](https://orcid.org/0000-0002-9192-4799), [I. Suzuki](https://orcid.org/0000-0002-8932-8226), [S. Isogami](https://orcid.org/0000-0001-7230-6090), [Y. K. Takahashi](https://orcid.org/0000-0001-9197-7236), [H. Suto](https://orcid.org/0000-0003-4387-5862)

## Rights

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 L1<sub>0</sub>-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.[In Copyright](http://rightsstatements.org/vocab/InC/1.0/)

## Other metadata

[Development of L10-ordered FePt with low damping and large perpendicular magnetic anisotropy by engineering the nanostructure](https://mdr.nims.go.jp/datasets/60955540-f737-46b3-932f-3d18df25ddf1)

## Fulltext

Supplemental MaterialDevelopment of L10-ordered FePt with low dampingand large perpendicular magnetic anisotropy by engi-neering the nanostructurePhillip David Bentley,1,2,∗ Yuta Sasaki,1,∗ Ippei Suzuki,1 Shinji Isogami,1 Yukiko Takahashi,1and Hirofumi Suto1,∗1National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan.2Kansai Institute for Photon Science, National Institutes for Quantum Science and Tech-nology, 8-1-7 Umemidai Kizugawa, Kyoto 619-0215, Japan*To whom correspondence should be addressed:Email: bentley.phillip@qst.go.jp and sasaki.yuta@nims.go.jp and suto.hirofumi@nims.go.jp1Supplementary Note 1A comparison of L10-ordered FePt grown on MgO(001) and SrTiO3 (STO) single crys-talline substrates which have similar frequency and perpendicular magnetic anisotropy(PMA). The FePt/STO sample shows a smaller intrinsic and effective damping α and αeffcompared to the FePt/MgO sample despite both samples having a similar PMA. Sinceboth materials have a similar PMA, this suggests that it is important to control othermechanisms such as the number of misfit dislocations, and the nanostructure, to optimizethe damping in FePt and other magnetic materials.FIG. S1. (a) Comparison of the raw TRMOKE spectra (blue dot) and fitting (solid redline) for a FePt/STO and FePt/MgO sample with similar PMA at the same applied fieldµ0H = 2.0 T and magnetic field angle θH = 70°, and (b) the fast Fourier transform (FFT)of these spectra where the frequency for both samples is centered around 170− 180 GHz.2FIG. S2. Frequency f and effective damping αeff as a function of magnetic field angleθH for L10-ordered FePt grown on MgO and STO. The solid points are experimentalresults, solid curve fitting using the Landau-Lifshitz-Gilbert equation, and the dottedline indicating the minimum αeff which for the FePt/STO and FePt/MgO sample is≈ 0.039 and 0.062, respectively.3