Origins of Thermal Spin Depolarization in Half-Metallic Ferromagnet CrO2

Hirokazu Fujiwara; Kensei Terashima; Masanori Sunagawa; Yuko Yano; Takanobu Nagayama; Tetsushi Fukura; Fumiya Yoshii; Yuka Matsuura; Makoto Ogata; Takanori Wakita; Koichiro Yaji; Ayumi Harasawa; Kenta Kuroda; Shik Shin; Koji Horiba; Hiroshi Kumigashira; Yuji Muraoka; Takayoshi Yokoya

doi:10.1103/PhysRevLett.121.257201

Origins of Thermal Spin Depolarization in Half-Metallic Ferromagnet CrO2

Hirokazu Fujiwara, Kensei Terashima, Masanori Sunagawa, Yuko Yano, Takanobu Nagayama, Tetsushi Fukura, Fumiya Yoshii, Yuka Matsuura, Makoto Ogata, Takanori Wakita, Koichiro Yaji, Ayumi Harasawa, Kenta Kuroda, Shik Shin, Koji Horiba, Hiroshi Kumigashira, Yuji Muraoka, Takayoshi Yokoya

IMRAM - Division of Inorganic Material Research

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

8 Citations (Scopus)

Abstract

Using high-resolution spin-resolved photoemission spectroscopy, we observe a thermal spin depolarization to which all spin-polarized electrons contribute. Furthermore, we observe a distinct minority spin state near the Fermi level and a corresponding depolarization that seldom contributes to demagnetization. The origin of this depolarization has been identified as the many-body effect characteristic of half-metallic ferromagnets. Our investigation opens an experimental field of itinerant ferromagnetic physics focusing on phenomena with sub-meV energy scale.

Original language	English
Article number	257201
Journal	Physical Review Letters
Volume	121
Issue number	25
DOIs	https://doi.org/10.1103/PhysRevLett.121.257201
Publication status	Published - 2018 Dec 18

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10.1103/PhysRevLett.121.257201

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Fujiwara, H., Terashima, K., Sunagawa, M., Yano, Y., Nagayama, T., Fukura, T., Yoshii, F., Matsuura, Y., Ogata, M., Wakita, T., Yaji, K., Harasawa, A., Kuroda, K., Shin, S., Horiba, K., Kumigashira, H., Muraoka, Y., & Yokoya, T. (2018). Origins of Thermal Spin Depolarization in Half-Metallic Ferromagnet CrO2. Physical Review Letters, 121(25), Article 257201. https://doi.org/10.1103/PhysRevLett.121.257201

@article{184fa003782149f3a57bcf2903edbf9f,

title = "Origins of Thermal Spin Depolarization in Half-Metallic Ferromagnet CrO2",

abstract = "Using high-resolution spin-resolved photoemission spectroscopy, we observe a thermal spin depolarization to which all spin-polarized electrons contribute. Furthermore, we observe a distinct minority spin state near the Fermi level and a corresponding depolarization that seldom contributes to demagnetization. The origin of this depolarization has been identified as the many-body effect characteristic of half-metallic ferromagnets. Our investigation opens an experimental field of itinerant ferromagnetic physics focusing on phenomena with sub-meV energy scale.",

author = "Hirokazu Fujiwara and Kensei Terashima and Masanori Sunagawa and Yuko Yano and Takanobu Nagayama and Tetsushi Fukura and Fumiya Yoshii and Yuka Matsuura and Makoto Ogata and Takanori Wakita and Koichiro Yaji and Ayumi Harasawa and Kenta Kuroda and Shik Shin and Koji Horiba and Hiroshi Kumigashira and Yuji Muraoka and Takayoshi Yokoya",

note = "Funding Information: We acknowledge H. Adachi, S. Onari, and M. Ichioka for valuable discussions. We thank T. Matsushita and S. Toyoda for their support of our data analysis. We also thank W. Hosoda, A. Takeda, and Y. Suga for technical support, and T. Kambe, T. C. Kobayashi, and their students for help with the magnetization measurements. The laser-based SRPES experiments were conducted at ISSP with the approval of ISSP (Proposals No. A296, No. B248, and No. A182). Parts of the ARPES experiments were performed under the Photon Factory Proposal No. 2018G127. This work was partially supported by the Program for Promoting the Enhancement of Research Universities and a Grant-in-Aid for the Japan Society for the Promotion of Science (JSPS) Fellows (No. 16J03208) from the Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT). H. F. was supported by a Grant-in-Aid for JSPS Fellows. Publisher Copyright: {\textcopyright} 2018 American Physical Society.",

year = "2018",

month = dec,

day = "18",

doi = "10.1103/PhysRevLett.121.257201",

language = "English",

volume = "121",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

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Fujiwara, H, Terashima, K, Sunagawa, M, Yano, Y, Nagayama, T, Fukura, T, Yoshii, F, Matsuura, Y, Ogata, M, Wakita, T, Yaji, K, Harasawa, A, Kuroda, K, Shin, S, Horiba, K, Kumigashira, H, Muraoka, Y & Yokoya, T 2018, 'Origins of Thermal Spin Depolarization in Half-Metallic Ferromagnet CrO2', Physical Review Letters, vol. 121, no. 25, 257201. https://doi.org/10.1103/PhysRevLett.121.257201

TY - JOUR

T1 - Origins of Thermal Spin Depolarization in Half-Metallic Ferromagnet CrO2

AU - Fujiwara, Hirokazu

AU - Terashima, Kensei

AU - Sunagawa, Masanori

AU - Yano, Yuko

AU - Nagayama, Takanobu

AU - Fukura, Tetsushi

AU - Yoshii, Fumiya

AU - Matsuura, Yuka

AU - Ogata, Makoto

AU - Wakita, Takanori

AU - Yaji, Koichiro

AU - Harasawa, Ayumi

AU - Kuroda, Kenta

AU - Shin, Shik

AU - Horiba, Koji

AU - Kumigashira, Hiroshi

AU - Muraoka, Yuji

AU - Yokoya, Takayoshi

N1 - Funding Information: We acknowledge H. Adachi, S. Onari, and M. Ichioka for valuable discussions. We thank T. Matsushita and S. Toyoda for their support of our data analysis. We also thank W. Hosoda, A. Takeda, and Y. Suga for technical support, and T. Kambe, T. C. Kobayashi, and their students for help with the magnetization measurements. The laser-based SRPES experiments were conducted at ISSP with the approval of ISSP (Proposals No. A296, No. B248, and No. A182). Parts of the ARPES experiments were performed under the Photon Factory Proposal No. 2018G127. This work was partially supported by the Program for Promoting the Enhancement of Research Universities and a Grant-in-Aid for the Japan Society for the Promotion of Science (JSPS) Fellows (No. 16J03208) from the Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT). H. F. was supported by a Grant-in-Aid for JSPS Fellows. Publisher Copyright: © 2018 American Physical Society.

PY - 2018/12/18

Y1 - 2018/12/18

N2 - Using high-resolution spin-resolved photoemission spectroscopy, we observe a thermal spin depolarization to which all spin-polarized electrons contribute. Furthermore, we observe a distinct minority spin state near the Fermi level and a corresponding depolarization that seldom contributes to demagnetization. The origin of this depolarization has been identified as the many-body effect characteristic of half-metallic ferromagnets. Our investigation opens an experimental field of itinerant ferromagnetic physics focusing on phenomena with sub-meV energy scale.

AB - Using high-resolution spin-resolved photoemission spectroscopy, we observe a thermal spin depolarization to which all spin-polarized electrons contribute. Furthermore, we observe a distinct minority spin state near the Fermi level and a corresponding depolarization that seldom contributes to demagnetization. The origin of this depolarization has been identified as the many-body effect characteristic of half-metallic ferromagnets. Our investigation opens an experimental field of itinerant ferromagnetic physics focusing on phenomena with sub-meV energy scale.

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U2 - 10.1103/PhysRevLett.121.257201

DO - 10.1103/PhysRevLett.121.257201

M3 - Article

C2 - 30608774

AN - SCOPUS:85059143370

SN - 0031-9007

VL - 121

JO - Physical Review Letters

JF - Physical Review Letters

IS - 25

M1 - 257201

ER -

Origins of Thermal Spin Depolarization in Half-Metallic Ferromagnet CrO2

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