Ferromagnetism in Fe-implanted a-plane ZnO films

P. Wu; G. Saraf; Y. Lu; D. H. Hill; R. Gateau; L. Wielunski; R. A. Bartynski; D. A. Arena; J. Dvorak; A. Moodenbaugh; T. Siegrist; J. A. Raley; Yung Kee Yeo

doi:10.1063/1.2213519

Ferromagnetism in Fe-implanted a-plane ZnO films

P. Wu, G. Saraf, Y. Lu, D. H. Hill, R. Gateau, L. Wielunski, R. A. Bartynski, D. A. Arena, J. Dvorak, A. Moodenbaugh, T. Siegrist, J. A. Raley, Yung Kee Yeo

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50 Scopus citations

Abstract

Fe ions of dose 5 × 10 ¹⁶ cm ^-2 were implanted at 200 keV into a-plane ZnO epitaxial films. The epitaxial quality of the postannealed samples was verified by x-ray diffraction ω-rocking curves and φ scans, whereas x-ray absorption spectroscopy identified the presence of both Fe ²⁺ and Fe ³⁺ ions, as well as changes in their relative concentration during postannealing. Superconducting quantum interference device measurements show that the as-implanted and postannealed films are ferromagnetic at room temperature. The saturation magnetization reduces during annealing possibly due to the decrease in the number of oxygen vacancies.

Original language	English (US)
Article number	012508
Journal	Applied Physics Letters
Volume	89
Issue number	1
DOIs	https://doi.org/10.1063/1.2213519
State	Published - 2006

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.2213519

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title = "Ferromagnetism in Fe-implanted a-plane ZnO films",

abstract = "Fe ions of dose 5 × 10 16 cm -2 were implanted at 200 keV into a-plane ZnO epitaxial films. The epitaxial quality of the postannealed samples was verified by x-ray diffraction ω-rocking curves and φ scans, whereas x-ray absorption spectroscopy identified the presence of both Fe 2+ and Fe 3+ ions, as well as changes in their relative concentration during postannealing. Superconducting quantum interference device measurements show that the as-implanted and postannealed films are ferromagnetic at room temperature. The saturation magnetization reduces during annealing possibly due to the decrease in the number of oxygen vacancies.",

author = "P. Wu and G. Saraf and Y. Lu and Hill, {D. H.} and R. Gateau and L. Wielunski and Bartynski, {R. A.} and Arena, {D. A.} and J. Dvorak and A. Moodenbaugh and T. Siegrist and Raley, {J. A.} and Yeo, {Yung Kee}",

note = "Funding Information: This work has been supported by National Science Foundation under the Grant No. ECS-0224166. The NSLS and the CFN at BNL are supported by the U.S. DOE under Contract No. DE-AC02-98CH10886.",

year = "2006",

doi = "10.1063/1.2213519",

language = "English (US)",

volume = "89",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics Publising LLC",

number = "1",

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TY - JOUR

T1 - Ferromagnetism in Fe-implanted a-plane ZnO films

AU - Wu, P.

AU - Saraf, G.

AU - Lu, Y.

AU - Hill, D. H.

AU - Gateau, R.

AU - Wielunski, L.

AU - Bartynski, R. A.

AU - Arena, D. A.

AU - Dvorak, J.

AU - Moodenbaugh, A.

AU - Siegrist, T.

AU - Raley, J. A.

AU - Yeo, Yung Kee

N1 - Funding Information: This work has been supported by National Science Foundation under the Grant No. ECS-0224166. The NSLS and the CFN at BNL are supported by the U.S. DOE under Contract No. DE-AC02-98CH10886.

PY - 2006

Y1 - 2006

N2 - Fe ions of dose 5 × 10 16 cm -2 were implanted at 200 keV into a-plane ZnO epitaxial films. The epitaxial quality of the postannealed samples was verified by x-ray diffraction ω-rocking curves and φ scans, whereas x-ray absorption spectroscopy identified the presence of both Fe 2+ and Fe 3+ ions, as well as changes in their relative concentration during postannealing. Superconducting quantum interference device measurements show that the as-implanted and postannealed films are ferromagnetic at room temperature. The saturation magnetization reduces during annealing possibly due to the decrease in the number of oxygen vacancies.

AB - Fe ions of dose 5 × 10 16 cm -2 were implanted at 200 keV into a-plane ZnO epitaxial films. The epitaxial quality of the postannealed samples was verified by x-ray diffraction ω-rocking curves and φ scans, whereas x-ray absorption spectroscopy identified the presence of both Fe 2+ and Fe 3+ ions, as well as changes in their relative concentration during postannealing. Superconducting quantum interference device measurements show that the as-implanted and postannealed films are ferromagnetic at room temperature. The saturation magnetization reduces during annealing possibly due to the decrease in the number of oxygen vacancies.

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JF - Applied Physics Letters

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ER -

Ferromagnetism in Fe-implanted a-plane ZnO films

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