講演情報
[15p-PB1-17]Anisotropic Exchange Stiffness in Perpendicularly Magnetized Co/Pt multilayer film
〇(P)Woonjae Won1, Yuta Sasaki1, Nobuaki Kikuchi2, Genta Egawa2, Keisuke Masuda1, Yukiko Takahashi1,3, Hirofumi Suto1 (1.NIMS, 2.Akita Univ., 3.Tohoku Univ.)
キーワード：
Exchange stiffness、All-Optical Time-Resolved Magneto-Optical Kerr Effect (AO-TRMOKE)、Multilayer
Three-dimensional (3D) heat-assisted magnetic recording (HAMR) [1-2] and 3D domain wall (DW) racetrack memory [3-4] are essential for overcoming the limitations in recording density and the reading/writing speeds of current magnetic recording technologies. perpendicular magnetic anisotropy (PMA), such as L10-FePt and Co/Pt multilayer, have been extensively researched. Recent reports suggest that these materials exhibit anisotropy in exchange stiffness (A_ex), which influences the size of spin textu different materials in their structure [5]. Here, A_ex in the out-of-plane direction (A_ex,OOP) plays a crucial role in the control of above 3D-based next-generation magnetic recording devices [4,6].
To date, A_ex,OOP standing spin wave (PSSW) through ferromagnetic resonance (FMR) [7]. When PMA is strong, however, conventional FMR technique remains difficult because of high resonance frequency. In this paper, we tried the observation of PSSW in Co/Pt magneto-optical Kerr effect (AO-TRMOKE) and demonstrate how to extract A_ex,OOP from this analysis. Furthermore, we provide the first experimental evidence of the anisotropic A_ex in magnetic materials with strong PMA.
Thiswork JPMXS03 20230032, Japan, JSPS KAKENHI Grant No. JP25K17659, and JST CREST Grant No. JPMJCR22C3, Japan.
References
[1] D. Weller et al., J. Vac. S0.6 [2] P. Tozman et al., Acta Mater. 271, 119869 (2024). [3] SSP Parkin et al., Science 320, 190 (2008). [4] YM Hung et al., J. Magn. Soc. Jpn. 42, 6 J. Phys. Soc. Jpn. 93, 054705 (2024). [6] J. -G. Zhu et al., IEEE Trans. Magn. 57, 3200809 (2021).
To date, A_ex,OOP standing spin wave (PSSW) through ferromagnetic resonance (FMR) [7]. When PMA is strong, however, conventional FMR technique remains difficult because of high resonance frequency. In this paper, we tried the observation of PSSW in Co/Pt magneto-optical Kerr effect (AO-TRMOKE) and demonstrate how to extract A_ex,OOP from this analysis. Furthermore, we provide the first experimental evidence of the anisotropic A_ex in magnetic materials with strong PMA.
Thiswork JPMXS03 20230032, Japan, JSPS KAKENHI Grant No. JP25K17659, and JST CREST Grant No. JPMJCR22C3, Japan.
References
[1] D. Weller et al., J. Vac. S0.6 [2] P. Tozman et al., Acta Mater. 271, 119869 (2024). [3] SSP Parkin et al., Science 320, 190 (2008). [4] YM Hung et al., J. Magn. Soc. Jpn. 42, 6 J. Phys. Soc. Jpn. 93, 054705 (2024). [6] J. -G. Zhu et al., IEEE Trans. Magn. 57, 3200809 (2021).