We report on terahertz radiation from topological insulator (TI) Sb2Te3 thin film under ultrafast optical excitation with different helicity. Polarity-reversals of the emitted THz radiation were observed as the helicity of optical pulses reversed. The observed phenomena are coincident with the characteristics of the helicity-dependent photocurrent on TIs. Our work demonstrates the potential applic...Show More
We report modification of the magnetic properties of Ir-Mn-based bottom spin-valve devices after insertion of a thin Fe-based nano-oxide layer (NOL). A sheet film with layer sequence Si/Ta/Pt/Ir20Mn80/Co/Ru/Co/FeOx/Co/Cu/Co/ Ni80Fe20/Ta was grown to fabricate the devices. Magnetization, magneto-transport, angle-dependent resistance, and Fe L3,2-edge X-ray absorption spectroscopy were performed on ...Show More
This work elucidates the electronic structure, electron field emission and magnetic behaviors of carbon nanotube (CNT) fabricated without catalyst by the dip deposition method on the La0.66Sr0.33MnO3 (LSMO) as base layer. X-ray absorption near edge spectroscopy (XANES), valence band spectroscopy (VBPES) and Raman spectroscopy were used for the study of electronic properties; whereas the magnetizat...Show More
