2017年第78回応用物理学会秋季学術講演会

講演情報

一般セッション(口頭講演)

10 スピントロニクス・マグネティクス » 10.2 スピン基盤技術・萌芽的デバイス技術

[6a-C18-1~12] 10.2 スピン基盤技術・萌芽的デバイス技術

10.1と10.2と10.3のコードシェアセッションあり

2017年9月6日(水) 09:00 〜 12:00 C18 (C18)

齋藤 秀和(産総研)

09:30 〜 09:45

[6a-C18-3] Geometrical effect on the spin accumulation signals in ferromagnet/insulator/Si tunnel junctions

Shoichi Sato1、Ryosho Nakane1,2、Takato Hada1、Masaaki Tanaka1,3 (1.The Univ. of Tokyo、2.IIIEE、3.CSRN)

キーワード:silicon, spin injection, three-terminal Hanle

The three-terminal Hanle (3TH) measurement has been frequently used to estimate the spin lifetime in semiconductors and the spin injection polarization in ferromagnet(FM)/insulator(I)/semiconductor(SC) tunnel junctions. However, little attention has been paid to the fact that 3TH signals are affected by the device structure when its electrode size or channel thickness are comparable to the spin diffusion length. Therefore, the device structure must be carefully considered to understand the spin physics more precisely. We have derived universal representation of the 3TH signals by integrating the impulse response over the junction area, and numerically calculated the conversion factors for spin lifetime and spin injection polarization. We experimentally verified our calculation results by investigating 3TH signals observed in FM/I/Si junctions having a Fe/Mg/SiOxNy/n+Si injector electrode with various shapes.