کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1803927 | 1024636 | 2008 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Giant magnetoresistance in Co–Al2O3 granular films prepared by self-organized growth Giant magnetoresistance in Co–Al2O3 granular films prepared by self-organized growth](/preview/png/1803927.png)
Co–Al2O3 granular films with a narrow distribution in cluster size of Co clusters embedded in Al2O3 matrix were prepared by sequential deposition based on self-organized growth. Resistivity dependence of giant magnetoresistance (GMR) was studied. The GMR takes a maximum of 5.2% at room temperature and 9.4% at 13 K and 5700 Gs when the resistivity of the sample is 4×105–7×105 μΩ cm. The temperature dependence of resistivities and GMR were discussed especially. A temperature dependence of conductance ρ∼exp[T1/(T+T0)] was found, which indicates the dominant conduction mechanism is fluctuation-induced tunneling. A linear relationship of GMR versus T was observed, GMR=a–kT, in applied magnetic field 5700 Gs. The remarkable character of temperature dependence of GMR should be due to the special microstructure that the clusters are monodispersed in the films.
Journal: Journal of Magnetism and Magnetic Materials - Volume 320, Issue 15, August 2008, Pages 2062–2067