Detection Of Spin Precession Research Articles

Electrical spin injection and detection of spin precession in room temperature bulk GaN lateral spin valves

We report the measurement of diffusive electronic spin transport characteristics in an epitaxial wurtzite GaN lateral spin valve at room temperature. Hanle spin precession and non-local spin accumulation measurements have been performed with the spin valves fabricated with FeCo/MgO spin contacts. Electron spin relaxation length and spin-flip lifetime of 176 nm and 37 ps, respectively, are derived from analysis of results obtained from four-terminal Hanle spin precession measurements at 300 K. The role of dislocations and defects in bulk GaN has also been examined in the context of electronic spin relaxation dynamics.

光ポンププローブSTM

A new microscopy, optical pump-probe scanning tunneling microscopy (OPP-STM), which enables femtosecond temporal resolution and atomic spatial resolution simultaneously, has been realized by combining STM with quantum optical method. Using circularly polarized light for excitation, the measurement of local ultrafast spin dynamics has also become possible. Detection of spin precession has enabled to provide local information of g-factor. Here, the bases for the new microscopy techniques are overviewed.