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Report No.

Spin transport in insulators without exchange stiffness

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.



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Category:Multidisciplinary Sciences



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