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Wu, C N; Tseng, C C; Fanchiang, Y T; Cheng, C K; Lin, K Y; Yeh, S L; Yang, S R; Wu, C T; Liu, T; Wu, M; Hong, M; Kwo, J
Scientific reports, 07/2018, Letnik: 8, Številka: 1Journal Article
Thulium iron garnet (TmIG) films with perpendicular magnetic anisotropy (PMA) were grown on gadolinium gallium garnet (GGG) (111) substrates by off-axis sputtering. High-resolution synchrotron radiation X-ray diffraction studies and spherical aberration-corrected scanning transmission electron microscope (Cs-corrected STEM) images showed the excellent crystallinity of the films and their sharp interface with GGG. Damping constant of TmIG thin film was determined to be 0.0133 by frequency-dependent ferromagnetic resonance (FMR) measurements. The saturation magnetization (M ) and the coercive field (H ) were obtained systematically as a function of the longitudinal distance (L) between the sputtering target and the substrate. A 170% enhancement of PMA field (H ) was achieved by tuning the film composition to increase the tensile strain. Moreover, current-induced magnetization switching on a Pt/TmIG structure was demonstrated with an ultra-low critical current density (j ) of 2.5 × 10 A/cm , an order of magnitude smaller than the previously reported value. We were able to tune M , H and H to obtain an ultra-low j of switching the magnetization, showing the great potential of sputtered TmIG films for spintronics.
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