Shiomi Y, Saitoh E
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan and WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan and CREST, Japan Science and Technology Agency, Tokyo 102-0076, Japan and Advanced Science Research Center, Japan Atomic Energy Agency, Tokai 319-1195, Japan.
Phys Rev Lett. 2014 Dec 31;113(26):266602. doi: 10.1103/PhysRevLett.113.266602. Epub 2014 Dec 23.
We have demonstrated spin pumping from a paramagnetic state of an insulator La2NiMnO6 into a Pt film. Single-crystalline films of La2NiMnO6 which exhibit a ferromagnetic order at TC≈270 K were grown by pulsed laser deposition. The inverse spin Hall voltage induced by spin-current injection has been observed in the Pt layer not only in the ferromagnetic phase of La2NiMnO6, but also in a wide temperature range above TC. The efficient spin pumping in the paramagnetic phase is ascribable to ferromagnetic correlation, not to ferromagnetic order.
我们已经证明了自旋从绝缘体La2NiMnO6的顺磁态注入到Pt薄膜中。通过脉冲激光沉积生长出在TC≈270 K时呈现铁磁序的La2NiMnO6单晶薄膜。不仅在La2NiMnO6的铁磁相中，而且在高于TC的较宽温度范围内，都在Pt层中观察到了由自旋电流注入引起的逆自旋霍尔电压。顺磁相中的高效自旋注入归因于铁磁关联，而非铁磁序。
