کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1593636 | 1002709 | 2011 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Large room-temperature magnetoresistance and temperature-dependent magnetoresistance inversion in La0.67Sr0.33MnO3/Alq3 - Co nanocomposites/Co devices Large room-temperature magnetoresistance and temperature-dependent magnetoresistance inversion in La0.67Sr0.33MnO3/Alq3 - Co nanocomposites/Co devices](/preview/png/1593636.png)
Large room-temperature (RT) magnetoresistance (MR) and temperature-dependent MR inversion have been observed in tris (8-hydroxyquinoline) aluminum (Alq3)-cobalt nanocomposites-based organic–inorganic hybrid devices. Negative MR–high resistance for parallel electrodes configuration — due to magnetization reversal of ferromagnetic (FM) electrodes has been observed at low temperatures. As the temperature increases, the MR undergoes a sign change. At room temperature, a positive MR of ∼9.7% with the resistivity dropping monotonously with increasing magnetic fields has been observed. The RT MR is about two orders of magnitude of that in organic-FM nanocomposites measured with nonmagnetic electrodes. The enhancement of RT MR is attributed to the injection of spin polarized carriers into Alq3-Co nanocomposites.
► Tris 8-hydroxyquinoline aluminum (Alq3)-cobalt nanocomposites as transport layer.
► Negative magnetoresistance (MR) is observed at low temperature.
► Large positive MR of about 9.7% is observed at room temperature.
► The MR undergoes a sign change with the increasing temperature.
Journal: Solid State Communications - Volume 151, Issue 9, May 2011, Pages 734–737