Ferromagnetic behavior above room temperature of Fe-ion-lmplanted ZnO

Y. Y. Song, K. S. Park, D. V. Son, S. C. Yu, H. J. Kang, S. W. Shin, C. N. Whang, Jong Heun Lee, J. H. Song, K. W. Lee

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Zinc-oxide (0001) single crystals with a 0.5 mm thickness were prepared, and then 80 keV Fe ions with a dose of 3 × 10 16 ions/cm 2 were implanted into the ZnO single crystals at 350°C The implanted samples were post-annealed at 700, 800 and 900°C by rapid thermal annealing in an N 2 atmosphere for 5 min to remove the ion-implantation damage. The structure and the magnetic properties of Fe-ion-implanted ZnO were investigated by using X-ray diffraction and a superconducting quantum interference device magnetometer. The carrier transport properties were measured in the range from 5 K to 300 K. The X-ray diffraction results showed an island peak near 37°C, which was identified as ZnO 2. The magnetization curve showed hysteresis loops at 5 K in the samples annealed at 700 and 800°C, showing ferromagnetism. Hysteresis loops were observed at 300 K in the samples annealed at 700°C The temperature dependence of the magnetization was taken in field cooling (FC) and zero field cooling (ZFC) in the samples annealed at 700°C The difference magnetization (ΔM) between the FC and the ZFC magnetizations did not converge to a zero value even at 340 K, showing ferromagnetism above room temperature. The magnetoresistance (MR) curve showed negative curvature up to 150 K which could be explained with the delocalized d state of ZnO implanted with Fe ions.

Original languageEnglish
Pages (from-to)1706-1710
Number of pages5
JournalJournal of the Korean Physical Society
Volume50
Issue number6
Publication statusPublished - 2007 Jun

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cooling
magnetization
room temperature
ferromagnetism
ions
hysteresis
single crystals
curves
diffraction
zinc oxides
magnetometers
ion implantation
x rays
transport properties
curvature
magnetic properties
damage
interference
atmospheres
dosage

Keywords

  • Fe-implanted ZnO
  • Ferromagnetism

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Song, Y. Y., Park, K. S., Son, D. V., Yu, S. C., Kang, H. J., Shin, S. W., ... Lee, K. W. (2007). Ferromagnetic behavior above room temperature of Fe-ion-lmplanted ZnO. Journal of the Korean Physical Society, 50(6), 1706-1710.

Ferromagnetic behavior above room temperature of Fe-ion-lmplanted ZnO. / Song, Y. Y.; Park, K. S.; Son, D. V.; Yu, S. C.; Kang, H. J.; Shin, S. W.; Whang, C. N.; Lee, Jong Heun; Song, J. H.; Lee, K. W.

In: Journal of the Korean Physical Society, Vol. 50, No. 6, 06.2007, p. 1706-1710.

Research output: Contribution to journalArticle

Song, YY, Park, KS, Son, DV, Yu, SC, Kang, HJ, Shin, SW, Whang, CN, Lee, JH, Song, JH & Lee, KW 2007, 'Ferromagnetic behavior above room temperature of Fe-ion-lmplanted ZnO', Journal of the Korean Physical Society, vol. 50, no. 6, pp. 1706-1710.
Song YY, Park KS, Son DV, Yu SC, Kang HJ, Shin SW et al. Ferromagnetic behavior above room temperature of Fe-ion-lmplanted ZnO. Journal of the Korean Physical Society. 2007 Jun;50(6):1706-1710.
Song, Y. Y. ; Park, K. S. ; Son, D. V. ; Yu, S. C. ; Kang, H. J. ; Shin, S. W. ; Whang, C. N. ; Lee, Jong Heun ; Song, J. H. ; Lee, K. W. / Ferromagnetic behavior above room temperature of Fe-ion-lmplanted ZnO. In: Journal of the Korean Physical Society. 2007 ; Vol. 50, No. 6. pp. 1706-1710.
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AU - Kang, H. J.

AU - Shin, S. W.

AU - Whang, C. N.

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AB - Zinc-oxide (0001) single crystals with a 0.5 mm thickness were prepared, and then 80 keV Fe ions with a dose of 3 × 10 16 ions/cm 2 were implanted into the ZnO single crystals at 350°C The implanted samples were post-annealed at 700, 800 and 900°C by rapid thermal annealing in an N 2 atmosphere for 5 min to remove the ion-implantation damage. The structure and the magnetic properties of Fe-ion-implanted ZnO were investigated by using X-ray diffraction and a superconducting quantum interference device magnetometer. The carrier transport properties were measured in the range from 5 K to 300 K. The X-ray diffraction results showed an island peak near 37°C, which was identified as ZnO 2. The magnetization curve showed hysteresis loops at 5 K in the samples annealed at 700 and 800°C, showing ferromagnetism. Hysteresis loops were observed at 300 K in the samples annealed at 700°C The temperature dependence of the magnetization was taken in field cooling (FC) and zero field cooling (ZFC) in the samples annealed at 700°C The difference magnetization (ΔM) between the FC and the ZFC magnetizations did not converge to a zero value even at 340 K, showing ferromagnetism above room temperature. The magnetoresistance (MR) curve showed negative curvature up to 150 K which could be explained with the delocalized d state of ZnO implanted with Fe ions.

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