Formation of anisotropic ferromagnetic response in rutile (TiO2) implanted with cobalt ions

R. Khaibullin, Sh.Z. Ibragimov, L.R. Tagirov, Vladimir Popok, I.B. Khaibullin

Research output: Contribution to journalJournal articleResearchpeer-review

17 Citations (Scopus)

Abstract

The (100)- and (001)-monocrystalline plates of rutile (TiO2) were implanted by 40 keV Co+ ions with fluences in wide range of 0.15–1.5 · 1017 ion/cm2 to study the development of ferromagnetism in the diamagnetic TiO2. With increase of fluence the implanted rutile plates reveal sequentially paramagnetic, superparamagnetic, weak ferromagnetic and, eventually, strong anisotropic ferromagnetic response at room temperature. The thermo-magnetic analysis shows that the ferromagnetic samples exhibit two magnetic transitions
with temperatures of the ferromagnetic ordering TC1 700 K and TC2 850 K, correspondingly. Heating of the samples in air strongly suppresses the ferromagnetic phases if the temperature of heating exceeds the corresponding transition temperature. Subsequent high vacuum annealing restores only the low-temperature ferromagnetic phase. The origin of the two magnetic phases and anisotropy of the ferromagnetism in the Co-implanted rutile are discussed in the model of two cobalt-rich layers with different concentration and
valence states of the implanted cobalt
Original languageEnglish
JournalNuclear Instruments and Methods in Physics Reseach B
Volume257
Issue number1-2
Pages (from-to)369-373
Number of pages4
ISSN0168-583X
DOIs
Publication statusPublished - Apr 2007
Externally publishedYes

Fingerprint

rutile
Cobalt
cobalt
ferromagnetism
Ferromagnetism
Ions
fluence
ions
heating
high vacuum
Heating
Temperature
transition temperature
Superconducting transition temperature
anisotropy
Anisotropy
annealing
temperature
air
Vacuum

Keywords

  • magnetic semiconductors
  • ion implantation
  • spintronics

Cite this

Khaibullin, R. ; Ibragimov, Sh.Z. ; Tagirov, L.R. ; Popok, Vladimir ; Khaibullin, I.B. / Formation of anisotropic ferromagnetic response in rutile (TiO2) implanted with cobalt ions. In: Nuclear Instruments and Methods in Physics Reseach B. 2007 ; Vol. 257, No. 1-2. pp. 369-373.
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abstract = "The (100)- and (001)-monocrystalline plates of rutile (TiO2) were implanted by 40 keV Co+ ions with fluences in wide range of 0.15–1.5 · 1017 ion/cm2 to study the development of ferromagnetism in the diamagnetic TiO2. With increase of fluence the implanted rutile plates reveal sequentially paramagnetic, superparamagnetic, weak ferromagnetic and, eventually, strong anisotropic ferromagnetic response at room temperature. The thermo-magnetic analysis shows that the ferromagnetic samples exhibit two magnetic transitionswith temperatures of the ferromagnetic ordering TC1 700 K and TC2 850 K, correspondingly. Heating of the samples in air strongly suppresses the ferromagnetic phases if the temperature of heating exceeds the corresponding transition temperature. Subsequent high vacuum annealing restores only the low-temperature ferromagnetic phase. The origin of the two magnetic phases and anisotropy of the ferromagnetism in the Co-implanted rutile are discussed in the model of two cobalt-rich layers with different concentration andvalence states of the implanted cobalt",
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author = "R. Khaibullin and Sh.Z. Ibragimov and L.R. Tagirov and Vladimir Popok and I.B. Khaibullin",
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Formation of anisotropic ferromagnetic response in rutile (TiO2) implanted with cobalt ions. / Khaibullin, R.; Ibragimov, Sh.Z.; Tagirov, L.R.; Popok, Vladimir; Khaibullin, I.B.

In: Nuclear Instruments and Methods in Physics Reseach B, Vol. 257, No. 1-2, 04.2007, p. 369-373.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Formation of anisotropic ferromagnetic response in rutile (TiO2) implanted with cobalt ions

AU - Khaibullin, R.

AU - Ibragimov, Sh.Z.

AU - Tagirov, L.R.

AU - Popok, Vladimir

AU - Khaibullin, I.B.

PY - 2007/4

Y1 - 2007/4

N2 - The (100)- and (001)-monocrystalline plates of rutile (TiO2) were implanted by 40 keV Co+ ions with fluences in wide range of 0.15–1.5 · 1017 ion/cm2 to study the development of ferromagnetism in the diamagnetic TiO2. With increase of fluence the implanted rutile plates reveal sequentially paramagnetic, superparamagnetic, weak ferromagnetic and, eventually, strong anisotropic ferromagnetic response at room temperature. The thermo-magnetic analysis shows that the ferromagnetic samples exhibit two magnetic transitionswith temperatures of the ferromagnetic ordering TC1 700 K and TC2 850 K, correspondingly. Heating of the samples in air strongly suppresses the ferromagnetic phases if the temperature of heating exceeds the corresponding transition temperature. Subsequent high vacuum annealing restores only the low-temperature ferromagnetic phase. The origin of the two magnetic phases and anisotropy of the ferromagnetism in the Co-implanted rutile are discussed in the model of two cobalt-rich layers with different concentration andvalence states of the implanted cobalt

AB - The (100)- and (001)-monocrystalline plates of rutile (TiO2) were implanted by 40 keV Co+ ions with fluences in wide range of 0.15–1.5 · 1017 ion/cm2 to study the development of ferromagnetism in the diamagnetic TiO2. With increase of fluence the implanted rutile plates reveal sequentially paramagnetic, superparamagnetic, weak ferromagnetic and, eventually, strong anisotropic ferromagnetic response at room temperature. The thermo-magnetic analysis shows that the ferromagnetic samples exhibit two magnetic transitionswith temperatures of the ferromagnetic ordering TC1 700 K and TC2 850 K, correspondingly. Heating of the samples in air strongly suppresses the ferromagnetic phases if the temperature of heating exceeds the corresponding transition temperature. Subsequent high vacuum annealing restores only the low-temperature ferromagnetic phase. The origin of the two magnetic phases and anisotropy of the ferromagnetism in the Co-implanted rutile are discussed in the model of two cobalt-rich layers with different concentration andvalence states of the implanted cobalt

KW - magnetic semiconductors

KW - ion implantation

KW - spintronics

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DO - 10.1016/j.nimb.2007.01.064

M3 - Journal article

VL - 257

SP - 369

EP - 373

JO - Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms

JF - Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms

SN - 0168-583X

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