journal article·2018-07-05

Intrinsic or Interface Clustering-Induced Ferromagnetism in Fe-Doped In2O3-Diluted Magnetic Semiconductors

Xi Luo, Li-Ting Tseng, Yiren Wang, Nina Bao, Zunming Lu, Xiang Ding, Rongkun Zheng, Yonghua Du, Kevin Huang, Lei Shu, Andreas Suter, Wai Tung Lee, Rong Liu, Jun Ding, Kiyonori Suzuki, Thomas Prokscha, Elvezio Morenzoni, Jia Bao Yi

ACS Applied Materials & Interfaces· Volume 10· Issue 26
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Abstract

Five percent Fe-doped In2O3 films were deposited using a pulsed laser deposition system. X-ray diffraction and transmission electron microscopy analysis show that the films deposited under oxygen partial pressures of 10–3 and 10–5 Torr are uniform without clusters or secondary phases. However, the film deposited under 10–7 Torr has a Fe-rich phase at the interface. Magnetic measurements demonstrate that the magnetization of the films increases with decreasing oxygen partial pressure. Muon spin relaxation (μSR) analysis indicates that the volume fractions of the ferromagnetic phases in PO2 = 10–3, 10–5, and 10–7 Torr-deposited samples are 23, 49, and 68%, respectively, suggesting that clusters or secondary phases may not be the origin of the ferromagnetism and that the ferromagnetism is not carrier-mediated. We propose that the formation of magnetic bound polarons is the origin of the ferromagnetism. In addition, both μSR and polarized neutron scattering demonstrate that the Fe-rich phase at the interface has a lower magnetization compared to the uniformly distributed phases.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: ZnO doping and properties · Ga2O3 and related materials · Electronic and Structural Properties of Oxides

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Materials Science and Engineering, UNSW, Kensington, NSW 2052, Australia

Department of Materials Science and Engineering, National University of Singapore, Singapore 119260

School of Physics, The University of Sydney, Sydney, NSW 2006, Australia

Institute of Chemical and Engineering Science, Agency for Science, Technology and Research (A*STAR), 1 Pesek Road, Jurong Island, Singapore 627833

State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200433, China

Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Villigen 5232, Switzerland

Bragg institute, ANSTO, New Illawarra Road, Lucas Heithers, NSW 2234, Australia

SIMS Facility, Office of the Deputy-Vice Chancellor (Research and Development), Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia

Department of Materials Science and Engineering, Monash University, Clayton, Victoria 3800, Australia

Global Innovative Centre for Advanced Nanomaterials, School of Engineering, The University of Newcastle, Callaghan, NSW 2308, Australia

Funding

Australian Research Council

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