Enhanced ferromagnetism in Cu-Substituted ZnO nanoparticles

Retno Asih; Dyah A. Daratika; Fahmi Astuti; Malik A. Baqiya; Isao Watanabe; Chatree Saiyasombat; Masatsune Kato; Yoji Koike; Andrivo Rusydi

doi:10.1016/j.matchemphys.2021.125606

Enhanced ferromagnetism in Cu-Substituted ZnO nanoparticles

Retno Asih^*, Dyah A. Daratika, Fahmi Astuti, Malik A. Baqiya, Isao Watanabe, Chatree Saiyasombat, Masatsune Kato, Yoji Koike, Andrivo Rusydi, Darminto^*

^*Corresponding author for this work

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

2 Citations (Scopus)

Abstract

Cu-substituted ZnO thin films are known to exhibit room-temperature ferromagnetism. Herein, we report a large enhancement of ferromagnetism in nanoparticles of Zn_1−xCu_xO (CZOs) at x ∼ 1/8. In addition to the magnetic moment arising from the Cu 3d⁹ spins, these nanoparticles provide a unique platform to produce a significant number of oxygen vacancies (V_Os), which gives rise to a long-range ferromagnetic order due to the interaction with the spins of Cu 3d⁹ through the oxygen vacancies and Cu 3d⁹ ligand holes. Interestingly, the highest magnetization occurs in CZO with x ≈ 0.13. Thus, our results emphasize the importance of the interplay between the Cu 3d⁹ spins with oxygen vacancies and Cu 3d⁹ ligand holes in generating a long-range ferromagnetic order.

Original language	English
Article number	125606
Journal	Materials Chemistry and Physics
Volume	278
DOIs	https://doi.org/10.1016/j.matchemphys.2021.125606
Publication status	Published - 15 Feb 2022

Keywords

Cu-substituted ZnO
Dilute magnetic semiconductor
Magnetism
Nanoparticles
Oxygen vacancies

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10.1016/j.matchemphys.2021.125606

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title = "Enhanced ferromagnetism in Cu-Substituted ZnO nanoparticles",

abstract = "Cu-substituted ZnO thin films are known to exhibit room-temperature ferromagnetism. Herein, we report a large enhancement of ferromagnetism in nanoparticles of Zn1−xCuxO (CZOs) at x ∼ 1/8. In addition to the magnetic moment arising from the Cu 3d9 spins, these nanoparticles provide a unique platform to produce a significant number of oxygen vacancies (VOs), which gives rise to a long-range ferromagnetic order due to the interaction with the spins of Cu 3d9 through the oxygen vacancies and Cu 3d9 ligand holes. Interestingly, the highest magnetization occurs in CZO with x ≈ 0.13. Thus, our results emphasize the importance of the interplay between the Cu 3d9 spins with oxygen vacancies and Cu 3d9 ligand holes in generating a long-range ferromagnetic order.",

keywords = "Cu-substituted ZnO, Dilute magnetic semiconductor, Magnetism, Nanoparticles, Oxygen vacancies",

author = "Retno Asih and Daratika, {Dyah A.} and Fahmi Astuti and Baqiya, {Malik A.} and Isao Watanabe and Chatree Saiyasombat and Masatsune Kato and Yoji Koike and Andrivo Rusydi and Darminto",

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year = "2022",

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day = "15",

doi = "10.1016/j.matchemphys.2021.125606",

language = "English",

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journal = "Materials Chemistry and Physics",

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T1 - Enhanced ferromagnetism in Cu-Substituted ZnO nanoparticles

AU - Asih, Retno

AU - Daratika, Dyah A.

AU - Astuti, Fahmi

AU - Baqiya, Malik A.

AU - Watanabe, Isao

AU - Saiyasombat, Chatree

AU - Kato, Masatsune

AU - Koike, Yoji

AU - Rusydi, Andrivo

AU - Darminto,

PY - 2022/2/15

Y1 - 2022/2/15

N2 - Cu-substituted ZnO thin films are known to exhibit room-temperature ferromagnetism. Herein, we report a large enhancement of ferromagnetism in nanoparticles of Zn1−xCuxO (CZOs) at x ∼ 1/8. In addition to the magnetic moment arising from the Cu 3d9 spins, these nanoparticles provide a unique platform to produce a significant number of oxygen vacancies (VOs), which gives rise to a long-range ferromagnetic order due to the interaction with the spins of Cu 3d9 through the oxygen vacancies and Cu 3d9 ligand holes. Interestingly, the highest magnetization occurs in CZO with x ≈ 0.13. Thus, our results emphasize the importance of the interplay between the Cu 3d9 spins with oxygen vacancies and Cu 3d9 ligand holes in generating a long-range ferromagnetic order.

AB - Cu-substituted ZnO thin films are known to exhibit room-temperature ferromagnetism. Herein, we report a large enhancement of ferromagnetism in nanoparticles of Zn1−xCuxO (CZOs) at x ∼ 1/8. In addition to the magnetic moment arising from the Cu 3d9 spins, these nanoparticles provide a unique platform to produce a significant number of oxygen vacancies (VOs), which gives rise to a long-range ferromagnetic order due to the interaction with the spins of Cu 3d9 through the oxygen vacancies and Cu 3d9 ligand holes. Interestingly, the highest magnetization occurs in CZO with x ≈ 0.13. Thus, our results emphasize the importance of the interplay between the Cu 3d9 spins with oxygen vacancies and Cu 3d9 ligand holes in generating a long-range ferromagnetic order.

KW - Cu-substituted ZnO

KW - Dilute magnetic semiconductor

KW - Magnetism

KW - Nanoparticles

KW - Oxygen vacancies

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U2 - 10.1016/j.matchemphys.2021.125606

DO - 10.1016/j.matchemphys.2021.125606

M3 - Article

AN - SCOPUS:85122527629

SN - 0254-0584

VL - 278

JO - Materials Chemistry and Physics

JF - Materials Chemistry and Physics

M1 - 125606

ER -

Enhanced ferromagnetism in Cu-Substituted ZnO nanoparticles

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Keywords

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