Identifying valency and occupation sites of Ir dopants in antiferromagnetic α-Fe2O3 thin films with X-ray absorption fine structure and Mössbauer spectroscopy

Tomohiro Nozaki, Satya Prakash Pati, Yohei Shiokawa, Motohiro Suzuki, Toshiaki Ina, Ko Mibu, Muftah Al-Mahdawi, Shujun Ye, Masashi Sahashi

Research output: Contribution to journalArticle

Abstract

A combined analysis of Ir-doped α-Fe2O3 (001) films, which show a drastic enhancement in the Morin transition temperature as a result of Ir doping, was performed by employing X-ray absorption near edge structure (XANES), extended X-ray absorption fine structure (EXAFS), and Mössbauer spectroscopy analyses at room temperature. The Mössbauer spectra reveal that the valency of Fe remains 3+ after Ir doping. The XANES spectra indicate that the valency of the Ir ion in Ir-doped α-Fe2O3 varies from 3+ to 4+. The EXAFS analysis results clarified that the Ir ions occupy the Fe-sites of α-Fe2O3. These findings help elucidate the mechanism for controlling the Morin transition temperature in α-Fe2O3 films toward antiferromagnetic spintronic applications.

Original languageEnglish
Article number113903
JournalJournal of Applied Physics
Volume125
Issue number11
DOIs
Publication statusPublished - 2019 Mar 21

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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