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The magnetic properties and microscopic structural of a ferromagnetic semiconductor: Rutile TIO2 single crystals implanted with cobalt ions

Ferromagnetic semiconductors with Curie temperatures higher than room temperature are highly desirable for development of spintronic devices. At room temperature, two crystals of rutile (TiO2) were implanted with Co+ at an energy of 80keV by using a fluence of 1×1017ions/cm2 and one of the Co-implan... Full description

Journal Title: Surface & Coatings Technology 25 August 2013, Vol.229, pp.109-111
Main Author: Zhong, Huo-Ping (钟火平)
Other Authors: Xu, Nan-Nan (许楠楠) , Li, Gong-Ping (李公平) , Li, Tian-Jing (李天晶) , Gao, Xing-Xin (高行新)
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 0257-8972 ; E-ISSN: 1879-3347 ; DOI: 10.1016/j.surfcoat.2012.12.014
Link: https://www.sciencedirect.com/science/article/pii/S0257897212012601
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recordid: elsevier_sdoi_10_1016_j_surfcoat_2012_12_014
title: The magnetic properties and microscopic structural of a ferromagnetic semiconductor: Rutile TIO2 single crystals implanted with cobalt ions
format: Article
creator:
  • Zhong, Huo-Ping (钟火平)
  • Xu, Nan-Nan (许楠楠)
  • Li, Gong-Ping (李公平)
  • Li, Tian-Jing (李天晶)
  • Gao, Xing-Xin (高行新)
subjects:
  • Ferromagnetic Semiconductors
  • Tio2
  • Ferromagnetic
  • Ion Implantation
  • Microstructure
  • Exafs
  • Engineering
  • Chemistry
ispartof: Surface & Coatings Technology, 25 August 2013, Vol.229, pp.109-111
description: Ferromagnetic semiconductors with Curie temperatures higher than room temperature are highly desirable for development of spintronic devices. At room temperature, two crystals of rutile (TiO2) were implanted with Co+ at an energy of 80keV by using a fluence of 1×1017ions/cm2 and one of the Co-implanted samples was annealed in N2 atmosphere at 900°C for 30min. The magnetic properties of Co-implanted samples were measured with superconducting quantum interference device magnetometer (SQUID) at room temperature. Furthermore, the X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and extended X-ray absorption fine structure (EXAFS) were applied to describe the structural and compositional properties of Co-implanted samples. In our study, the ferromagnetic behavior of Co-implanted samples is detected at room temperature. The saturation magnetization of the un-annealed sample is ~6.32×10−4emu/cm3 and the annealed sample is ~6.26×10−5emu/cm3. Present studies by XRD, XPS and EXAFS indicate that the Co is in a formal oxidation state throughout the implanted region in the annealed sample, and there is sufficient evidence that showed the presence of cobalt single qualitative state for the un-annealed sample. We also attempt to clarify the relation between ferromagnetic behavior and microscopic structure of the Co-implanted samples in this paper. Highlights► Ion implantation can provide Co-implanted rutile crystal TiO2 with TC above room temperature. ► Co metallic clusters disappeared and oxidized Co was observed clearly in the annealed sample. ► The magnetization of the Co-implanted sample can still be observed after annealing. ► We can not rule out that the magnetization decreased is caused by the defect reduction.
language: eng
source:
identifier: ISSN: 0257-8972 ; E-ISSN: 1879-3347 ; DOI: 10.1016/j.surfcoat.2012.12.014
fulltext: fulltext
issn:
  • 0257-8972
  • 02578972
  • 1879-3347
  • 18793347
url: Link


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titleThe magnetic properties and microscopic structural of a ferromagnetic semiconductor: Rutile TIO2 single crystals implanted with cobalt ions
creatorZhong, Huo-Ping (钟火平) ; Xu, Nan-Nan (许楠楠) ; Li, Gong-Ping (李公平) ; Li, Tian-Jing (李天晶) ; Gao, Xing-Xin (高行新)
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subjectFerromagnetic Semiconductors ; Tio2 ; Ferromagnetic ; Ion Implantation ; Microstructure ; Exafs ; Engineering ; Chemistry
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descriptionFerromagnetic semiconductors with Curie temperatures higher than room temperature are highly desirable for development of spintronic devices. At room temperature, two crystals of rutile (TiO2) were implanted with Co+ at an energy of 80keV by using a fluence of 1×1017ions/cm2 and one of the Co-implanted samples was annealed in N2 atmosphere at 900°C for 30min. The magnetic properties of Co-implanted samples were measured with superconducting quantum interference device magnetometer (SQUID) at room temperature. Furthermore, the X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and extended X-ray absorption fine structure (EXAFS) were applied to describe the structural and compositional properties of Co-implanted samples. In our study, the ferromagnetic behavior of Co-implanted samples is detected at room temperature. The saturation magnetization of the un-annealed sample is ~6.32×10−4emu/cm3 and the annealed sample is ~6.26×10−5emu/cm3. Present studies by XRD, XPS and EXAFS indicate that the Co is in a formal oxidation state throughout the implanted region in the annealed sample, and there is sufficient evidence that showed the presence of cobalt single qualitative state for the un-annealed sample. We also attempt to clarify the relation between ferromagnetic behavior and microscopic structure of the Co-implanted samples in this paper. Highlights► Ion implantation can provide Co-implanted rutile crystal TiO2 with TC above room temperature. ► Co metallic clusters disappeared and oxidized Co was observed clearly in the annealed sample. ► The magnetization of the Co-implanted sample can still be observed after annealing. ► We can not rule out that the magnetization decreased is caused by the defect reduction.
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authorZhong, Huo-Ping (钟火平) ; Xu, Nan-Nan (许楠楠) ; Li, Gong-Ping (李公平) ; Li, Tian-Jing (李天晶) ; Gao, Xing-Xin (高行新)
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