Reversible 300 K Ferromagnetic Ordering in a Diluted Magnetic Semiconductor.

✍ Scribed by Dana A. Schwartz; Daniel R. Gamelin

• Publisher: John Wiley and Sons
• Year: 2005
• Weight: 9 KB
• Volume: 36
• Category: Article
• ISSN: 0931-7597
• DOI: 10.1002/chin.200511019

✦ Synopsis

Magnetic properties D 9000

Reversible 300 K Ferromagnetic Ordering in a Diluted Magnetic Semiconductor.

-As revealed by electronic absorption spectroscopy and magnetic susceptibility measurements Co 2+ :ZnO shows a reversible 300 K feromagnetic ordering that can be switched between "on" and "off" states with quantitative reproducibility by introducing and removing interstitial Zn, the native n-type defect of ZnO. A double-exchange mechanism for ferromagnetism is suggested that involves electron delocalization among substitutionally doped cobalt ions. The results present new opportunities for spin-based device applications that may considerably impact future information-processing technologies. -(SCHWARTZ, D. A.; GAMELIN*, D. R.; Adv. Mater.