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

JOURNAL OF ALLOYS AND COMPOUNDS

卷:875

Article

Chang, Po-Chun¹  Mudinepalli, Venkata Ramana¹  Liu, Shi-Yu¹  Lin, Hung-Lin¹  Hsu, Chuan-Che¹  Liao, Yu-Tso¹  Obinata, Sora²  Kimura, Takashi²  Chern, Ming-Yau³  Lo, Fang-Yuh¹  Lin, Wen-Chin¹ 

[1] Natl Taiwan Normal Univ, Dept Phys, Taipei 11677, Taiwan

[2] Kyushu Univ, Dept Phys, 744 Motooka, Fukuoka 8190395, Japan

[3] Natl Taiwan Univ, Dept Phys, Taipei 10617, Taiwan

关键词: Ferrimagnetic;    Interface;    Magnetic Oxide;    Spin pumping;    Exchange bias;   

DOI  :  10.1016/j.jallcom.2021.159948

来源: Elsevier

【 摘 要 】

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. (c) 2021 Elsevier B.V. All rights reserved.

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