2015年9月
Multiferroic Vacancies at Ferroelectric PbTiO3 Surfaces
PHYSICAL REVIEW LETTERS
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- 巻
- 115
- 号
- 10
- 開始ページ
- 107202
- 終了ページ
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/PhysRevLett.115.107202
- 出版者・発行元
- AMER PHYSICAL SOC
Multiferroics in nanoscale dimensions are promising for novel functional device paradigms, such as magnetoelectric memories, due to an intriguing cross-coupling between coexisting ferroelectric and (anti) ferromagnetic order parameters. However, the ferroic order is inevitably destroyed below the critical dimension of several nanometers. Here, we demonstrate a new path towards atomic-size multiferroics while resolving the controversial origin of dilute ferromagnetism that unexpectedly emerges in nanoparticles of nonmagnetic ferroelectric PbTiO3. Systematic exploration using predictive quantum-mechanical calculations demonstrates that oxygen vacancies formed at surfaces induce ferromagnetism due to local nonstoichiometry and orbital symmetry breaking. The localized character of the emerged magnetization allows an individual oxygen vacancy to act as an atomic-scale multiferroic element with a nonlinear magnetoelectric effect that involves rich ferromagnetic-antiferromagnetic-nonmagnetic phase transitions in response to switching of the spontaneous polarization.
- リンク情報
- ID情報
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- DOI : 10.1103/PhysRevLett.115.107202
- ISSN : 0031-9007
- eISSN : 1079-7114
- Web of Science ID : WOS:000360528200009