http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
재현 김,김도진,Hyojin Kim,Woong Kil Choo,YoungEon Ihm 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
We report on the magnetoresistance and magnetic properties of the oxide-diluted magnetic semiconductor Zn$_{1-x}$Co$_x$O ($x=0.02-0.25$) thin films grown on sapphire substrates by pulsed laser deposition. Magnetization measurements show almost paramagnetic behavior with a large negative value of the Curie--Weiss temperature, corresponding to a stronger antiferromagnetic exchange coupling than Mn-doped ZnO. The injection of itinerant electrons over 10$^{19}$ cm$^{-3}$ is achieved by Al doping. Magnetoresistance measurements for $n$-type Zn$_{1-x}$Co$_x$O:Al reveal three qualitatively different behaviors depending on the Co concentration. We observe a giant positive magnetoresistance as large as 60 \% for $x=0.20$ at 5 K.