Effect of substrate temperature on the room-temperature ferromagnetism of Cu-doped ZnO films

Fan Yong Ran; Masaki Tanemura; Yasuhiko Hayashi; Takehiko Hihara

doi:10.1016/j.jcrysgro.2009.07.008

Effect of substrate temperature on the room-temperature ferromagnetism of Cu-doped ZnO films

Fan Yong Ran, Masaki Tanemura, Yasuhiko Hayashi, Takehiko Hihara

Research output: Contribution to journal › Article › peer-review

31 Citations (Scopus)

Abstract

Wurtzite structure ZnO films doped with ~2 at% Cu were deposited at substrate temperatures (T_s) from 350 to 600 °C by helicon magnetron sputtering. All the films exhibited room-temperature (RT) ferromagnetism (FM) and the maximum saturation magnetization (M_s) was 1.2 emu/cm³ (~0.15 μ_B/Cu). Cu ions were mainly in a divalent state as identified by X-ray photoelectron spectroscopy. FM tended to increase with decreasing T_s, and vacuum annealing enhanced the M_s. These results suggested that oxygen vacancies and/or zinc interstitials might contribute to the ferromagnetic performance. Thus, the observed FM was explained in terms of the defect related mechanism.

Original language	English
Pages (from-to)	4270-4274
Number of pages	5
Journal	Journal of Crystal Growth
Volume	311
Issue number	17
DOIs	https://doi.org/10.1016/j.jcrysgro.2009.07.008
Publication status	Published - Aug 15 2009
Externally published	Yes

Keywords

A1. Doping
A3. Helicon magnetron sputtering
B2. Magnetic semiconductor
B2. Semiconducting II-VI materials

ASJC Scopus subject areas

Condensed Matter Physics
Inorganic Chemistry
Materials Chemistry

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10.1016/j.jcrysgro.2009.07.008

Cite this

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title = "Effect of substrate temperature on the room-temperature ferromagnetism of Cu-doped ZnO films",

abstract = "Wurtzite structure ZnO films doped with ~2 at% Cu were deposited at substrate temperatures (Ts) from 350 to 600 °C by helicon magnetron sputtering. All the films exhibited room-temperature (RT) ferromagnetism (FM) and the maximum saturation magnetization (Ms) was 1.2 emu/cm3 (~0.15 μB/Cu). Cu ions were mainly in a divalent state as identified by X-ray photoelectron spectroscopy. FM tended to increase with decreasing Ts, and vacuum annealing enhanced the Ms. These results suggested that oxygen vacancies and/or zinc interstitials might contribute to the ferromagnetic performance. Thus, the observed FM was explained in terms of the defect related mechanism.",

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T1 - Effect of substrate temperature on the room-temperature ferromagnetism of Cu-doped ZnO films

AU - Ran, Fan Yong

AU - Tanemura, Masaki

AU - Hayashi, Yasuhiko

AU - Hihara, Takehiko

PY - 2009/8/15

Y1 - 2009/8/15

N2 - Wurtzite structure ZnO films doped with ~2 at% Cu were deposited at substrate temperatures (Ts) from 350 to 600 °C by helicon magnetron sputtering. All the films exhibited room-temperature (RT) ferromagnetism (FM) and the maximum saturation magnetization (Ms) was 1.2 emu/cm3 (~0.15 μB/Cu). Cu ions were mainly in a divalent state as identified by X-ray photoelectron spectroscopy. FM tended to increase with decreasing Ts, and vacuum annealing enhanced the Ms. These results suggested that oxygen vacancies and/or zinc interstitials might contribute to the ferromagnetic performance. Thus, the observed FM was explained in terms of the defect related mechanism.

AB - Wurtzite structure ZnO films doped with ~2 at% Cu were deposited at substrate temperatures (Ts) from 350 to 600 °C by helicon magnetron sputtering. All the films exhibited room-temperature (RT) ferromagnetism (FM) and the maximum saturation magnetization (Ms) was 1.2 emu/cm3 (~0.15 μB/Cu). Cu ions were mainly in a divalent state as identified by X-ray photoelectron spectroscopy. FM tended to increase with decreasing Ts, and vacuum annealing enhanced the Ms. These results suggested that oxygen vacancies and/or zinc interstitials might contribute to the ferromagnetic performance. Thus, the observed FM was explained in terms of the defect related mechanism.

KW - A1. Doping

KW - A3. Helicon magnetron sputtering

KW - B2. Magnetic semiconductor

KW - B2. Semiconducting II-VI materials

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JO - Journal of Crystal Growth

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Effect of substrate temperature on the room-temperature ferromagnetism of Cu-doped ZnO films

Abstract

Keywords

ASJC Scopus subject areas

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