Research Abstract


Towards coherent spin precession in pure-spin current

2012年9月4日 Scientific Reports 2 : 628 doi: 10.1038/srep00628


井土 宏1,2, 福間 康裕2,3 & 大谷 義近1,2

  1. 東京大学 物性研究所
  2. 理化学研究所 基幹研究所
  3. 九州工業大学 若手研究者フロンティア研究アカデミー
Non-local spin injection in lateral spin valves generates a pure spin current which is a diffusive flow of spins (i.e. spin angular momentums) with no net charge flow. The diffusive spins lose phase coherency in precession while undergoing frequent collisions and these events lead to a broad distribution of the dwell time in a transport channel between the injector and the detector. Here we show the lateral spin-valves with dual injectors enable us to detect a genuine in-plane precession signal from the Hanle effect, demonstrating the phase coherency in the in-plane precession is improved with an increase of the channel length. The coherency in the spin precession shows a universal behavior as a function of the normalized separation between the injector and the detector in material-independent fashion for metals and semiconductors including graphene.