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

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Article number159948
JournalJournal of Alloys and Compounds
Volume875
DOIs
Publication statusPublished - Sep 15 2021

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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