検索対象:     
報告書番号:
※ 半角英数字
 年 ~ 
 年

Spin transport in insulators without exchange stiffness

交換スティッフネスなしの絶縁体におけるスピン輸送

大柳 洸一*; 高橋 三郎*; Cornelissen, L. J.*; Shan, J.*; 大門 俊介*; 吉川 貴史*; Bauer, G. E. W.*; Van Wees, B. J.*; 齊藤 英治

Oyanagi, Koichi*; Takahashi, Saburo*; Cornelissen, L. J.*; Shan, J.*; Daimon, Shunsuke*; Kikkawa, Takashi*; Bauer, G. E. W.*; Van Wees, B. J.*; Saito, Eiji

The discovery of new materials that efficiently transmit spin currents has been important for spintronics and material science. The electric insulator Gd$$_3$$Ga$$_5$$O$$_{12}$$ (GGG), a standard substrate for growing magnetic films, can be a spin current generator, but has never been considered as a superior conduit for spin currents. Here we report spin current propagation in paramagnetic GGG over several microns. Surprisingly, spin transport persists up to temperatures of 100 K $$gg$$ T$$_g$$=180 mK, the magnetic glass-like transition temperature of GGG. At 5 K and 3.5 T, we find a spin diffusion length $$lambda_mathrm{GGG}=1.8pm0.2$$ $$mu$$m and a spin conductivity $$sigma_mathrm{GGG}=(7.3 pm 0.3)times 10^4$$ Sm$$^{-1}$$ that is larger than that of the record quality magnet Y$$_3$$Fe$$_5$$O$$_{12}$$ (YIG). We conclude that exchange stiffness is not required for efficient spin transport, which challenges conventional models and provides new material-design strategies for spintronic devices.

Access

:

- Accesses

InCites™

:

パーセンタイル:90.18

分野:Multidisciplinary Sciences

Altmetrics

:

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.