Valence states and the magnetism of Eu ions in Eu-doped GaN

Takumi Nunokawa, Yasufumi Fujiwara, Yusuke Miyata, Norifumi Fujimura, Takahiro Sakurai, Hitoshi Ohta, Akira Masago, Hikari Shinya, Tetsuya Fukushima, Kazunori Sato, Hiroshi Katayama-Yoshida

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1 Citation (Scopus)

Abstract

The relationship between the valence states of Eu ions in Eu-doped GaN and their magnetic properties is investigated by experiments and simulations. X-ray measurements have verified that the valence states of Eu ions can be controlled through growth temperature and codopants and that the highest concentration of divalent Eu ions is found in samples grown at 700 ° C by codoping with Si and O. According to our phenomenological analysis, magnetoresistance measurement implies the presence of Zener's p-f exchange interaction. However, the magnetization dependence on an external magnetic field shows non-hysteretic sigmoidal curves in all the samples. Our simulations suggest that this is due to the formation of nanostructures of the magnetic impurities in the samples by spinodal decomposition.

Original languageEnglish
Article number083901
JournalJournal of Applied Physics
Volume127
Issue number8
DOIs
Publication statusPublished - 2020 Feb 24

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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