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

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

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24 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)4270-4274
Number of pages5
JournalJournal of Crystal Growth
Volume311
Issue number17
DOIs
Publication statusPublished - Aug 15 2009
Externally publishedYes

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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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