Suspended single-wall carbon nanotube (SWCNT) thin film bolometers have been fabricated on microchannels patterned on Si substrates using electron-beam lithography. The much improved bolometric photoresponse is attributed to the reduced thermal link between SWCNT bolometer and substrate, which can be controlled by tuning the width and spacing of the microchannels. The detectivity D∗ up to 4.5×105 cm Hz1/2/W has been obtained at room temperature, which is at least five times better than that of the unsuspended counterpart and may be further improved via elimination of metallic SWCNTs and improvement of the charge and heat transport across the intertube junctions.

Cation distributions estimated using the magnetic moments of the spinel ferrites Co 1−𝑥 Cr 𝑥 Fe 2 O 4 at 10 K * Shang Zhi-Feng(尚志丰) a) , Qi Wei-Hua(齐伟华) a) , Ji Deng-Hui(纪登辉) a)b) , Xu Jing(徐 静) a) , Tang Gui-De(唐贵德) a) † , Zhang Xiao-Yun(张晓云) a) , Li Zhuang-Zhi(李壮志) a) , and Lang Li-Li(郎莉莉) a) a)

The magnetic and transport properties of the Co2FeGa Heusler alloy have been investigated. The results show that the temperature dependence of the magnetization follows the spin-wave behaviour at low temperature. The electrical resistivity behaves according to a ∼T2 power law, which may be mainly attributed to electron–electron scattering, and the contribution of electron–phonon scattering to the resistivity seems to be small. We have not observed remarkable magnetoresistance in our measurements. Point contact Andreev reflection measurements of the spin-polarization yield a polarization of 59%, which is consistent with the theoretical prediction by a first-principles calculation.

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