Interfacial exchange coupling-modulated magnetism in the insulating heterostructure of CoOx/yttrium iron garnet

Po Chun Chang; Venkata Ramana Mudinepalli; Shi Yu Liu; Hung Lin Lin; Chuan Che Hsu; Yu Tso Liao; Sora Obinata; Takashi Kimura; Ming Yau Chern; Fang Yuh Lo; Wen Chin Lin

doi:10.1016/j.jallcom.2021.159948

Interfacial exchange coupling-modulated magnetism in the insulating heterostructure of CoO_x/yttrium iron garnet

Po Chun Chang, Venkata Ramana Mudinepalli, Shi Yu Liu, Hung Lin Lin, Chuan Che Hsu, Yu Tso Liao, Sora Obinata, Takashi Kimura, Ming Yau Chern, Fang Yuh Lo^*, Wen Chin Lin

^*Corresponding author for this work

Department of Physics

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

3 Citations (Scopus)

Abstract

The combination of yttrium iron garnet (Y₃Fe₂(FeO₄)₃, YIG) and ferromagnetic materials or antiferromagnetic materials has attracted much attention because of its potential in applications such as spin pumping. In this study, a high-temperature and oxygen-poor environment was used to deposit a CoO_x top layer on YIG for the observation of magnetic modulation. The temperature- and saturation-field-dependent bias shift of the YIG hysteresis loop was observed. The complex modulation of the magnetic behavior originated from the magnetic coupling of the antiferromagnetic CoO and an additional interfacial coupling of the ferromagnetic CoO_x. Depth-profiling X-ray photoemission spectroscopy revealed the nonuniform stoichiometric distribution in the 20-nm CoO_x layer, which confirmed the origin of the various magnetic coupling effects on the bottom YIG layer. The comparative ferromagnetic resonance measurements also demonstrated the considerable magnetic coupling effect on the dynamic magnetism of the YIG.

Original language	English
Article number	159948
Journal	Journal of Alloys and Compounds
Volume	875
DOIs	https://doi.org/10.1016/j.jallcom.2021.159948
Publication status	Published - 2021 Sept 15

Keywords

Exchange bias
Ferrimagnetic
Interface
Magnetic Oxide
Spin pumping

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.jallcom.2021.159948

Cite this

@article{af1ea94ac79c40d8a5f40e3b7f82d217,

title = "Interfacial exchange coupling-modulated magnetism in the insulating heterostructure of CoOx/yttrium iron garnet",

abstract = "The combination of yttrium iron garnet (Y3Fe2(FeO4)3, YIG) and ferromagnetic materials or antiferromagnetic materials has attracted much attention because of its potential in applications such as spin pumping. In this study, a high-temperature and oxygen-poor environment was used to deposit a CoOx top layer on YIG for the observation of magnetic modulation. The temperature- and saturation-field-dependent bias shift of the YIG hysteresis loop was observed. The complex modulation of the magnetic behavior originated from the magnetic coupling of the antiferromagnetic CoO and an additional interfacial coupling of the ferromagnetic CoOx. Depth-profiling X-ray photoemission spectroscopy revealed the nonuniform stoichiometric distribution in the 20-nm CoOx layer, which confirmed the origin of the various magnetic coupling effects on the bottom YIG layer. The comparative ferromagnetic resonance measurements also demonstrated the considerable magnetic coupling effect on the dynamic magnetism of the YIG.",

keywords = "Exchange bias, Ferrimagnetic, Interface, Magnetic Oxide, Spin pumping",

author = "Chang, {Po Chun} and Mudinepalli, {Venkata Ramana} and Liu, {Shi Yu} and Lin, {Hung Lin} and Hsu, {Chuan Che} and Liao, {Yu Tso} and Sora Obinata and Takashi Kimura and Chern, {Ming Yau} and Lo, {Fang Yuh} and Lin, {Wen Chin}",

note = "Funding Information: This study was financially sponsored by Ministry of Science and Technology of Taiwan under Grant No. MOST 108–2112-M-003–011-MY2 and JST CREST under Grant No. JPMJCR18J1 . The data that support the findings of this study are available from the corresponding author upon reasonable request. Publisher Copyright: {\textcopyright} 2021 Elsevier B.V.",

year = "2021",

month = sep,

day = "15",

doi = "10.1016/j.jallcom.2021.159948",

language = "English",

volume = "875",

journal = "Journal of Alloys and Compounds",

issn = "0925-8388",

publisher = "Elsevier BV",

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TY - JOUR

T1 - Interfacial exchange coupling-modulated magnetism in the insulating heterostructure of CoOx/yttrium iron garnet

AU - Chang, Po Chun

AU - Mudinepalli, Venkata Ramana

AU - Liu, Shi Yu

AU - Lin, Hung Lin

AU - Hsu, Chuan Che

AU - Liao, Yu Tso

AU - Obinata, Sora

AU - Kimura, Takashi

AU - Chern, Ming Yau

AU - Lo, Fang Yuh

AU - Lin, Wen Chin

N1 - Funding Information: This study was financially sponsored by Ministry of Science and Technology of Taiwan under Grant No. MOST 108–2112-M-003–011-MY2 and JST CREST under Grant No. JPMJCR18J1 . The data that support the findings of this study are available from the corresponding author upon reasonable request. Publisher Copyright: © 2021 Elsevier B.V.

PY - 2021/9/15

Y1 - 2021/9/15

N2 - The combination of yttrium iron garnet (Y3Fe2(FeO4)3, YIG) and ferromagnetic materials or antiferromagnetic materials has attracted much attention because of its potential in applications such as spin pumping. In this study, a high-temperature and oxygen-poor environment was used to deposit a CoOx top layer on YIG for the observation of magnetic modulation. The temperature- and saturation-field-dependent bias shift of the YIG hysteresis loop was observed. The complex modulation of the magnetic behavior originated from the magnetic coupling of the antiferromagnetic CoO and an additional interfacial coupling of the ferromagnetic CoOx. Depth-profiling X-ray photoemission spectroscopy revealed the nonuniform stoichiometric distribution in the 20-nm CoOx layer, which confirmed the origin of the various magnetic coupling effects on the bottom YIG layer. The comparative ferromagnetic resonance measurements also demonstrated the considerable magnetic coupling effect on the dynamic magnetism of the YIG.

AB - The combination of yttrium iron garnet (Y3Fe2(FeO4)3, YIG) and ferromagnetic materials or antiferromagnetic materials has attracted much attention because of its potential in applications such as spin pumping. In this study, a high-temperature and oxygen-poor environment was used to deposit a CoOx top layer on YIG for the observation of magnetic modulation. The temperature- and saturation-field-dependent bias shift of the YIG hysteresis loop was observed. The complex modulation of the magnetic behavior originated from the magnetic coupling of the antiferromagnetic CoO and an additional interfacial coupling of the ferromagnetic CoOx. Depth-profiling X-ray photoemission spectroscopy revealed the nonuniform stoichiometric distribution in the 20-nm CoOx layer, which confirmed the origin of the various magnetic coupling effects on the bottom YIG layer. The comparative ferromagnetic resonance measurements also demonstrated the considerable magnetic coupling effect on the dynamic magnetism of the YIG.

KW - Exchange bias

KW - Ferrimagnetic

KW - Interface

KW - Magnetic Oxide

KW - Spin pumping

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