Investigation of Gilbert damping of a tetragonally distorted ultrathin Fe0.5Co0.5 epitaxial film with high magnetic anisotropy

R. Mandal; J. W. Jung; K. Masuda; Y. K. Takahashi; Y. Sakuraba; S. Kasai; Y. Miura; T. Ohkubo; K. Hono

doi:10.1063/1.5052721

Investigation of Gilbert damping of a tetragonally distorted ultrathin Fe_0.5Co_0.5 epitaxial film with high magnetic anisotropy

R. Mandal, J. W. Jung, K. Masuda, Y. K. Takahashi^*, Y. Sakuraba, S. Kasai, Y. Miura, T. Ohkubo, K. Hono

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

We have investigated the Gilbert damping, α, of a tetragonally distorted, perpendicular magnetic anisotropic (PMA) ultrathin Fe_0.5Co_0.5 film grown on a Rh-buffered MgO(100) substrate fabricated by magnetron sputtering at room temperature by means of the time-resolved magneto-optical Kerr effect. We obtained the highest PMA value of 0.573 MJ/m³ ever reported for the Fe_0.5Co_0.5/Rh film. The PMA strongly depends on the lattice distortion which originates from the epitaxial growth in the large lattice misfit system of Fe_0.5Co_0.5 and Rh. We have estimated an unusually high value of α = 0.041 ± 0.002 for a 1 nm thick Fe_0.5Co_0.5 film. Based on the microstructural observation and the first-principles calculation, we conclude that the large α in the ultrathin Fe_0.5Co_0.5 film comes from the minority-spin electron transition around the Fermi level mediated by the spin-orbit interaction, which is caused by the large lattice distortion.

Original language	English
Article number	232406
Journal	Applied Physics Letters
Volume	113
Issue number	23
DOIs	https://doi.org/10.1063/1.5052721
Publication status	Published - 2018 Dec 3
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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Investigation of Gilbert damping of a tetragonally distorted ultrathin Fe_0.5Co_0.5 epitaxial film with high magnetic anisotropy. / Mandal, R.; Jung, J. W.; Masuda, K.; Takahashi, Y. K.; Sakuraba, Y.; Kasai, S.; Miura, Y.; Ohkubo, T.; Hono, K.

In: Applied Physics Letters, Vol. 113, No. 23, 232406, 03.12.2018.

Research output: Contribution to journal › Article › peer-review

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title = "Investigation of Gilbert damping of a tetragonally distorted ultrathin Fe0.5Co0.5 epitaxial film with high magnetic anisotropy",

abstract = "We have investigated the Gilbert damping, α, of a tetragonally distorted, perpendicular magnetic anisotropic (PMA) ultrathin Fe0.5Co0.5 film grown on a Rh-buffered MgO(100) substrate fabricated by magnetron sputtering at room temperature by means of the time-resolved magneto-optical Kerr effect. We obtained the highest PMA value of 0.573 MJ/m3 ever reported for the Fe0.5Co0.5/Rh film. The PMA strongly depends on the lattice distortion which originates from the epitaxial growth in the large lattice misfit system of Fe0.5Co0.5 and Rh. We have estimated an unusually high value of α = 0.041 ± 0.002 for a 1 nm thick Fe0.5Co0.5 film. Based on the microstructural observation and the first-principles calculation, we conclude that the large α in the ultrathin Fe0.5Co0.5 film comes from the minority-spin electron transition around the Fermi level mediated by the spin-orbit interaction, which is caused by the large lattice distortion.",

author = "R. Mandal and Jung, {J. W.} and K. Masuda and Takahashi, {Y. K.} and Y. Sakuraba and S. Kasai and Y. Miura and T. Ohkubo and K. Hono",

note = "Funding Information: This work was supported by JSPS KAKENHI Grant Nos. 18H03787 and 17H06152 and the ImPACT Program of Council for Science, Technology and Innovation, Japan. We also thank Dr. I. Suzuki for technical assistance during the X-ray diffraction measurements and H. Tajiri and L. S. R. Kumara for their help in analysing the crystal structure of Fe0.5Co0.5 in this work. Publisher Copyright: {\textcopyright} 2018 Author(s).",

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AU - Sakuraba, Y.

AU - Kasai, S.

AU - Miura, Y.

AU - Ohkubo, T.

AU - Hono, K.

N1 - Funding Information: This work was supported by JSPS KAKENHI Grant Nos. 18H03787 and 17H06152 and the ImPACT Program of Council for Science, Technology and Innovation, Japan. We also thank Dr. I. Suzuki for technical assistance during the X-ray diffraction measurements and H. Tajiri and L. S. R. Kumara for their help in analysing the crystal structure of Fe0.5Co0.5 in this work. Publisher Copyright: © 2018 Author(s).

PY - 2018/12/3

Y1 - 2018/12/3

N2 - We have investigated the Gilbert damping, α, of a tetragonally distorted, perpendicular magnetic anisotropic (PMA) ultrathin Fe0.5Co0.5 film grown on a Rh-buffered MgO(100) substrate fabricated by magnetron sputtering at room temperature by means of the time-resolved magneto-optical Kerr effect. We obtained the highest PMA value of 0.573 MJ/m3 ever reported for the Fe0.5Co0.5/Rh film. The PMA strongly depends on the lattice distortion which originates from the epitaxial growth in the large lattice misfit system of Fe0.5Co0.5 and Rh. We have estimated an unusually high value of α = 0.041 ± 0.002 for a 1 nm thick Fe0.5Co0.5 film. Based on the microstructural observation and the first-principles calculation, we conclude that the large α in the ultrathin Fe0.5Co0.5 film comes from the minority-spin electron transition around the Fermi level mediated by the spin-orbit interaction, which is caused by the large lattice distortion.

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Investigation of Gilbert damping of a tetragonally distorted ultrathin Fe_0.5Co_0.5 epitaxial film with high magnetic anisotropy

Abstract

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