[11a-E214-1~11] 10.1 Emerging materials in spintronics and magnetics (including fabrication and characterization methodologies)

10:45 AM - 11:00 AM JST(1:45 AM - 2:00 AM UTC)

[11a-E214-7] Anisotropic Magnetic Damping in Compositionally-graded Ru:LSMO Thin Films

〇Kenichi Kaminaga¹, Abiko Yuto¹, Ajia Saijian¹, Tetsuro Ueno², Yohiyuki Ohtsubo², Seiji Sakai², Songtian Li², Takayasu Hanashima³, Kazuhiro Akutsu-Suyama³, Shingo Maruyama^1,4, Hiroyuki Aoki^5,6, Yasushi Endo^1,7, Yuji Matsumoto¹ (1.Tohoku Univ., 2.QST, 3.CROSS, 4.Shizuoka Univ., 5.JAEA, 6.KEK, 7.CSIS)

Keywords:

compositionally-graded structure,LSMO,PLD

Compositionally-graded Ru:LSMO thin films with a linear Ru concentration varying from 0% at the substrate to 10% at the surface were fabricated on LSAT(001), and their spin dynamics were investigated by CPW-FMR. Unlike hetero-bilayer films, the graded film exhibited a single FMR mode indicative of exchange-coupled collective spin precession. The effective damping constants extracted from the frequency dependence of the linewidth were enhanced in the in-plane field configuration and markedly suppressed in the out-of-plane configuration, with an in-plane/out-of-plane ratio reaching approximately 39. These results demonstrate that the depth-dependent magnetic profile governs the dynamic relaxation of the entire film.