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  Single-crystal epitaxial europium iron garnet films with strain-induced perpendicular magnetic anisotropy: Structural, strain, magnetic, and spin transport properties

Guo, M. X., Cheng, C. K., Liu, Y. C., Wu, C. N., Chen, W. N., Chen, T. Y., et al. (2022). Single-crystal epitaxial europium iron garnet films with strain-induced perpendicular magnetic anisotropy: Structural, strain, magnetic, and spin transport properties. Physical Review Materials, 6(5): 054412, pp. 1-8. doi:10.1103/PhysRevMaterials.6.054412.

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 Creators:
Guo, M. X.1, Author
Cheng, C. K.1, Author
Liu, Y. C.1, Author
Wu, C. N.2, Author              
Chen, W. N.1, Author
Chen, T. Y.1, Author
Wu, C. T.1, Author
Hsu, C. H.1, Author
Zhou, S. Q.1, Author
Chang, C. F.3, Author              
Tjeng, L. H.4, Author              
Lee, S. F.1, Author
Pai, C. F.1, Author
Hong, M.1, Author
Kwo, J.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
3Chun-Fu Chang, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863447              
4Liu Hao Tjeng, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863452              

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 Abstract: Single-crystal europium iron garnet (EuIG) thin films were epitaxially grown on gadolinium gallium garnet (GGG)(001) substrates using off-axis sputtering and showed strain-induced perpendicular magnetic anisotropy (PMA). By varying the sputtering conditions, we have tuned the europium/iron (Eu/Fe) composition ratios in the films to tailor the film strains. The films exhibited an extremely smooth, particle-free surface with a root-mean-square roughness as low as 0.1 nm, as observed by atomic force microscopy. High-resolution x-ray diffraction analysis and reciprocal space maps showed pseudomorphic film growth, a very smooth film/substrate interface, excellent film crystallinity with a rocking curve of 0.012 degrees (omega scans), and an in-plane compressive strain without relaxation. In addition, spherical aberration-corrected scanning transmission electron microscopy showed an atomically abrupt interface between the EuIG film and GGG. The saturation magnetization (M-s) and coercive field (H-c) were measured using a vibrating sample magnetometer. The square-shaped out-of-plane M-H loops in conjunction with angle-dependent x-ray magnetic dichroism demonstrated the PMA in the films. The spin Hall magnetoresistance on Pt/EuIG samples was measured to obtain the PMA field strength (H-perpendicular to), which increases from 4.21 to 18.87 kOe with the increasing Eu/Fe ratio and in-plane compressive strain. We also measured spin transport in the Pt/EuIG bilayer structure and directly obtained the real part of spin mixing conductance to be 3.48 x 10(14) Omega(-)(1) m(-2). We demonstrated current-induced magnetization switching with a low critical switching current density of 3.5 x 10(6) A/cm(2), showing excellent potential for low-dissipation spintronic devices.

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Language(s): eng - English
 Dates: 2022-05-312022-05-31
 Publication Status: Published in print
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Title: Physical Review Materials
  Abbreviation : Phys. Rev. Mater.
Source Genre: Journal
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Publ. Info: College Park, MD : American Physical Society
Pages: - Volume / Issue: 6 (5) Sequence Number: 054412 Start / End Page: 1 - 8 Identifier: ISSN: 2475-9953
CoNE: https://pure.mpg.de/cone/journals/resource/2475-9953