Detecting quadrupole: a hidden source of magnetic anisotropy for Manganese alloys

Jun Okabayashi; Yoshio Miura; Yohei Kota; Kazuya Z. Suzuki; Akimasa Sakuma; Shigemi Mizukami

doi:10.1038/s41598-020-66432-9

Detecting quadrupole: a hidden source of magnetic anisotropy for Manganese alloys

Jun Okabayashi, Yoshio Miura, Yohei Kota, Kazuya Z. Suzuki, Akimasa Sakuma, Shigemi Mizukami

Advanced Institute for Materials Research (AIMR)

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

12 Citations (Scopus)

Abstract

Mn-based alloys exhibit unique properties in the spintronics materials possessing perpendicular magnetic anisotropy (PMA) beyond the Fe and Co-based alloys. It is desired to figure out the quantum physics of PMA inherent to Mn-based alloys, which have never been reported. Here, the origin of PMA in ferrimagnetic Mn_{3− δ} Ga ordered alloys is investigated to resolve antiparallel-coupled Mn sites using x-ray magnetic circular and linear dichroism (XMCD/XMLD) and a first-principles calculation. We found that the contribution of orbital magnetic moments in PMA is small from XMCD and that the finite quadrupole-like orbital distortion through spin-flipped electron hopping is dominant from XMLD and theoretical calculations. These findings suggest that the spin-flipped orbital quadrupole formations originate from the PMA in Mn_{3− δ} Ga and bring the paradigm shift in the researches of PMA materials using x-ray magnetic spectroscopies.

Original language	English
Article number	9744
Journal	Scientific Reports
Volume	10
Issue number	1
DOIs	https://doi.org/10.1038/s41598-020-66432-9
Publication status	Published - 2020 Dec 1

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title = "Detecting quadrupole: a hidden source of magnetic anisotropy for Manganese alloys",

abstract = "Mn-based alloys exhibit unique properties in the spintronics materials possessing perpendicular magnetic anisotropy (PMA) beyond the Fe and Co-based alloys. It is desired to figure out the quantum physics of PMA inherent to Mn-based alloys, which have never been reported. Here, the origin of PMA in ferrimagnetic Mn3− δ Ga ordered alloys is investigated to resolve antiparallel-coupled Mn sites using x-ray magnetic circular and linear dichroism (XMCD/XMLD) and a first-principles calculation. We found that the contribution of orbital magnetic moments in PMA is small from XMCD and that the finite quadrupole-like orbital distortion through spin-flipped electron hopping is dominant from XMLD and theoretical calculations. These findings suggest that the spin-flipped orbital quadrupole formations originate from the PMA in Mn3− δ Ga and bring the paradigm shift in the researches of PMA materials using x-ray magnetic spectroscopies.",

author = "Jun Okabayashi and Yoshio Miura and Yohei Kota and {Z. Suzuki}, Kazuya and Akimasa Sakuma and Shigemi Mizukami",

note = "Funding Information: This work was partially supported by JSPS KAKENHI (Grant No. 16H06332), and Spintronics Research Network of Japan. Part of research was performed under the support from Toyota Physical and Chemical Research Institute. Parts of the synchrotron radiation experiments were performed under the approval of the Photon Factory Program Advisory Committee, KEK (Nos. 2017G060 and 2019G028). Publisher Copyright: {\textcopyright} 2020, The Author(s).",

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doi = "10.1038/s41598-020-66432-9",

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AU - Okabayashi, Jun

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AU - Z. Suzuki, Kazuya

AU - Sakuma, Akimasa

AU - Mizukami, Shigemi

N1 - Funding Information: This work was partially supported by JSPS KAKENHI (Grant No. 16H06332), and Spintronics Research Network of Japan. Part of research was performed under the support from Toyota Physical and Chemical Research Institute. Parts of the synchrotron radiation experiments were performed under the approval of the Photon Factory Program Advisory Committee, KEK (Nos. 2017G060 and 2019G028). Publisher Copyright: © 2020, The Author(s).

PY - 2020/12/1

Y1 - 2020/12/1

N2 - Mn-based alloys exhibit unique properties in the spintronics materials possessing perpendicular magnetic anisotropy (PMA) beyond the Fe and Co-based alloys. It is desired to figure out the quantum physics of PMA inherent to Mn-based alloys, which have never been reported. Here, the origin of PMA in ferrimagnetic Mn3− δ Ga ordered alloys is investigated to resolve antiparallel-coupled Mn sites using x-ray magnetic circular and linear dichroism (XMCD/XMLD) and a first-principles calculation. We found that the contribution of orbital magnetic moments in PMA is small from XMCD and that the finite quadrupole-like orbital distortion through spin-flipped electron hopping is dominant from XMLD and theoretical calculations. These findings suggest that the spin-flipped orbital quadrupole formations originate from the PMA in Mn3− δ Ga and bring the paradigm shift in the researches of PMA materials using x-ray magnetic spectroscopies.

AB - Mn-based alloys exhibit unique properties in the spintronics materials possessing perpendicular magnetic anisotropy (PMA) beyond the Fe and Co-based alloys. It is desired to figure out the quantum physics of PMA inherent to Mn-based alloys, which have never been reported. Here, the origin of PMA in ferrimagnetic Mn3− δ Ga ordered alloys is investigated to resolve antiparallel-coupled Mn sites using x-ray magnetic circular and linear dichroism (XMCD/XMLD) and a first-principles calculation. We found that the contribution of orbital magnetic moments in PMA is small from XMCD and that the finite quadrupole-like orbital distortion through spin-flipped electron hopping is dominant from XMLD and theoretical calculations. These findings suggest that the spin-flipped orbital quadrupole formations originate from the PMA in Mn3− δ Ga and bring the paradigm shift in the researches of PMA materials using x-ray magnetic spectroscopies.

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Detecting quadrupole: a hidden source of magnetic anisotropy for Manganese alloys

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