Effect of Ar ion irradiation on the room temperature ferromagnetism of undoped and Cu-doped rutile TiO2 single crystals

doi:10.1088/1674-1056/25/11/116103

Abstract

Remarkable room-temperature ferromagnetism was observed both in undoped and Cu-doped rutile TiO₂ single crystals (SCs). To tune their magnetism, Ar ion irradiation was quantitatively performed on the two crystals in which the saturation magnetizations for the samples were enhanced distinctively. The post-irradiation led to a spongelike layer in the near surface of the Cu-doped TiO₂. Meanwhile, a new CuO-like species present in the sample was found to be dissolved after the post-irradiation. Analyzing the magnetization data unambiguously reveals that the experimentally observed ferromagnetism is related to the intrinsic defects rather than the exotic Cu ions, while these ions are directly involved in boosting the absorption in the visible region.

Keywords: single-crystal TiO₂ Cu ion implantation Ar ion irradiation/post-irradiation room-temperature ferromagnetism

Received: 12 June 2016
Revised: 08 July 2016
Accepted manuscript online:

PACS:	61.80.-x	(Physical radiation effects, radiation damage)
	61.72.-y	(Defects and impurities in crystals; microstructure)
	75.50.-y	(Studies of specific magnetic materials)

Fund:

Project supported by the National Natural Science Foundation of China (Grant No. 11575074), the Open Project of State Key laboratory of Crystal Material, Shandong University, China (Grant No. KF1311), the Open Project of Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, China (Grant No. LZUMMM2012003), the Open Project of Key Laboratory of Beam Technology and Material Modification of Ministry of Education, Beijing Normal University, China (Grant No. 201204), and the Fundamental Research Funds for the Central Universities, China (Grant No. lzujbky-2015-240).

Corresponding Authors: Gong-Ping Li
E-mail: ligp@lzu.edu.cn

Cite this article:

Nan-Nan Xu(许楠楠), Gong-Ping Li(李公平), Qiao-Lu Lin(林俏露), Huan Liu(刘欢), Liang-Man Bao(包良满) Effect of Ar ion irradiation on the room temperature ferromagnetism of undoped and Cu-doped rutile TiO₂ single crystals 2016 Chin. Phys. B 25 116103

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Effect of Ar ion irradiation on the room temperature ferromagnetism of undoped and Cu-doped rutile TiO2 single crystals

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Effect of Ar ion irradiation on the room temperature ferromagnetism of undoped and Cu-doped rutile TiO₂ single crystals