Pfeiffer A, Reeve R M, Kläui M
Institut für Physik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany. Graduate School of Excellence Materials Science in Mainz (MAINZ), Staudinger Weg 9, 55128 Mainz, Deutschland.
J Phys Condens Matter. 2018 Nov 21;30(46):465802. doi: 10.1088/1361-648X/aae5ed. Epub 2018 Oct 3.
Lateral spin valves are attractive device geometries where functional spin currents can be generated and detected by various mechanisms, such as spin injection and the direct and the inverse spin Hall effect. To understand the mechanisms behind these effects better, as well as their potential for application in devices, we combine multiple mechanisms in multi-terminal Pt-Py-Cu lateral spin valves: we generate pure spin currents in the copper spin conduit both via the spin Hall effect in platinum and electric spin injection from permalloy and detect signals both via conventional non-local detection and via the inverse spin Hall effect in the same device at variable temperatures. Differences are observed, which we explain by the different spin injection and detection mechanisms, revealing their importance for the temperature dependence, which is not just governed by the spin transport in the conduit as previously claimed. By determining a different sensitivity of the observed effects on the interfaces, we highlight the importance of the exact current path for the device operation.
横向自旋阀是一种具有吸引力的器件结构，在其中可以通过各种机制产生和检测功能性自旋电流，例如自旋注入以及直接和逆自旋霍尔效应。为了更好地理解这些效应背后的机制及其在器件中的应用潜力，我们在多端Pt-Py-Cu横向自旋阀中结合了多种机制：我们通过铂中的自旋霍尔效应和坡莫合金的电自旋注入在铜自旋管道中产生纯自旋电流，并在可变温度下通过传统的非局部检测以及同一器件中的逆自旋霍尔效应来检测信号。观察到了差异，我们用不同的自旋注入和检测机制来解释这些差异，揭示了它们对温度依赖性的重要性，而温度依赖性并不像之前所声称的那样仅由管道中的自旋输运来决定。通过确定观察到的效应在界面上的不同灵敏度，我们强调了精确电流路径对器件操作的重要性。
