Observing the orbital angular momentum of Fe and Co in chiral magnet Fe0.75Co0.25Si using soft x-ray magnetic circular dichroism

M. Mito; M. Ohkuma; T. Tajiri; Y. Kousaka; J. Akimitsu; K. Inoue; K. Amamiya

doi:10.1063/5.0086493

Observing the orbital angular momentum of Fe and Co in chiral magnet Fe_0.75Co_0.25Si using soft x-ray magnetic circular dichroism

M. Mito, M. Ohkuma, T. Tajiri, Y. Kousaka, J. Akimitsu, K. Inoue, K. Amamiya

Research Institute for Interdisciplinary Science

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

Abstract

The intermetallic compound Fe 1 - xCo xSi has a helical magnetic order for 0.05 < x < 0.8, whereas its orbital angular momentum contributing to the occurrence of a Dzyaloshinskii-Moriya interaction has not yet been verified. We applied soft x-ray magnetic circular dichroism spectroscopy on the Fe L 2, 3 and Co L 2, 3 edges below T c for Fe 0.75Co 0.25Si such that their orbital magnetic moments m orb were evaluated independently. The dichroic signals provide direct experimental evidence that m orb for both Fe and Co is coupled in a parallel manner with each spin counterpart m spin. The ratio of m orb to m spin is independently estimated as m orb/ m spin ∼ 3% for Fe and 9% for Co. By comparing the average of the two m spin values with the saturated magnetization using a commercial superconducting quantum interference device (SQUID) magnetometer, the hole number in the d bands for both Fe and Co is roughly estimated as approximately 1.5. This suggests that Fe and Co should be arranged closely for stabilizing the ferromagnetic moments.

Original language	English
Article number	153902
Journal	Journal of Applied Physics
Volume	131
Issue number	15
DOIs	https://doi.org/10.1063/5.0086493
Publication status	Published - Apr 21 2022

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1063/5.0086493

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title = "Observing the orbital angular momentum of Fe and Co in chiral magnet Fe0.75Co0.25Si using soft x-ray magnetic circular dichroism",

abstract = "The intermetallic compound Fe 1 - xCo xSi has a helical magnetic order for 0.05 < x < 0.8, whereas its orbital angular momentum contributing to the occurrence of a Dzyaloshinskii-Moriya interaction has not yet been verified. We applied soft x-ray magnetic circular dichroism spectroscopy on the Fe L 2, 3 and Co L 2, 3 edges below T c for Fe 0.75Co 0.25Si such that their orbital magnetic moments m orb were evaluated independently. The dichroic signals provide direct experimental evidence that m orb for both Fe and Co is coupled in a parallel manner with each spin counterpart m spin. The ratio of m orb to m spin is independently estimated as m orb/ m spin ∼ 3% for Fe and 9% for Co. By comparing the average of the two m spin values with the saturated magnetization using a commercial superconducting quantum interference device (SQUID) magnetometer, the hole number in the d bands for both Fe and Co is roughly estimated as approximately 1.5. This suggests that Fe and Co should be arranged closely for stabilizing the ferromagnetic moments.",

author = "M. Mito and M. Ohkuma and T. Tajiri and Y. Kousaka and J. Akimitsu and K. Inoue and K. Amamiya",

note = "Funding Information: This XMCD experiment was conducted at KEK under the approval of KEK-PF, Proposal No. 2020R-06. This study was supported by Grants-in-Aid for Scientific Research, Grant No. (S) 25220803, from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. This study was also supported by the Center for Chiral Science at Hiroshima University (the MEXT program for promoting the enhancement of research universities, Japan) and the JSPS Core-to-Core Program, A. Advanced Research Networks. Publisher Copyright: {\textcopyright} 2022 Author(s).",

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doi = "10.1063/5.0086493",

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T1 - Observing the orbital angular momentum of Fe and Co in chiral magnet Fe0.75Co0.25Si using soft x-ray magnetic circular dichroism

AU - Mito, M.

AU - Ohkuma, M.

AU - Tajiri, T.

AU - Kousaka, Y.

AU - Akimitsu, J.

AU - Inoue, K.

AU - Amamiya, K.

N1 - Funding Information: This XMCD experiment was conducted at KEK under the approval of KEK-PF, Proposal No. 2020R-06. This study was supported by Grants-in-Aid for Scientific Research, Grant No. (S) 25220803, from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan. This study was also supported by the Center for Chiral Science at Hiroshima University (the MEXT program for promoting the enhancement of research universities, Japan) and the JSPS Core-to-Core Program, A. Advanced Research Networks. Publisher Copyright: © 2022 Author(s).

PY - 2022/4/21

Y1 - 2022/4/21

N2 - The intermetallic compound Fe 1 - xCo xSi has a helical magnetic order for 0.05 < x < 0.8, whereas its orbital angular momentum contributing to the occurrence of a Dzyaloshinskii-Moriya interaction has not yet been verified. We applied soft x-ray magnetic circular dichroism spectroscopy on the Fe L 2, 3 and Co L 2, 3 edges below T c for Fe 0.75Co 0.25Si such that their orbital magnetic moments m orb were evaluated independently. The dichroic signals provide direct experimental evidence that m orb for both Fe and Co is coupled in a parallel manner with each spin counterpart m spin. The ratio of m orb to m spin is independently estimated as m orb/ m spin ∼ 3% for Fe and 9% for Co. By comparing the average of the two m spin values with the saturated magnetization using a commercial superconducting quantum interference device (SQUID) magnetometer, the hole number in the d bands for both Fe and Co is roughly estimated as approximately 1.5. This suggests that Fe and Co should be arranged closely for stabilizing the ferromagnetic moments.

AB - The intermetallic compound Fe 1 - xCo xSi has a helical magnetic order for 0.05 < x < 0.8, whereas its orbital angular momentum contributing to the occurrence of a Dzyaloshinskii-Moriya interaction has not yet been verified. We applied soft x-ray magnetic circular dichroism spectroscopy on the Fe L 2, 3 and Co L 2, 3 edges below T c for Fe 0.75Co 0.25Si such that their orbital magnetic moments m orb were evaluated independently. The dichroic signals provide direct experimental evidence that m orb for both Fe and Co is coupled in a parallel manner with each spin counterpart m spin. The ratio of m orb to m spin is independently estimated as m orb/ m spin ∼ 3% for Fe and 9% for Co. By comparing the average of the two m spin values with the saturated magnetization using a commercial superconducting quantum interference device (SQUID) magnetometer, the hole number in the d bands for both Fe and Co is roughly estimated as approximately 1.5. This suggests that Fe and Co should be arranged closely for stabilizing the ferromagnetic moments.

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Observing the orbital angular momentum of Fe and Co in chiral magnet Fe_0.75Co_0.25Si using soft x-ray magnetic circular dichroism

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