H2020Индивидуална стипендия2020–2022

GRISOTO · GRaphene-Interfaced heterostructures for Spin Orbit TOrques

„Хоризонт 2020“ — Действия „Мария Склодовска-Кюри“

Период: 2020-05-01 → 2022-06-22
Финансиране от ЕС: 160 932 €
Участници: 1
Схема: MSCA-IF

Линиите свързват координатора с партньорите.

Накратко на български

Графенът и материали с голямо спин-орбитално взаимодействие се комбинират в слоеве, за да се превърне електрическият ток в спинов ток. Този механизъм помага за подобряване на управлението на магнитната памет от следващо поколение.

Този кратък обзор е генериран от изкуствен интелект

Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.

Резултати накратко

GRaphene-Interfaced heterostructures for Spin Orbit TOrques

This project aimed at combining materials exhibiting two-dimensional transport for the generation of spin-orbit torques (SOT). We stacked graphene (which possesses very large electronic mobility) on top of materials with large spin-orbit coupling (SOC). Making use of the proximity effect, the close contact of both materials allows for the conversion from charge to spin current. Such conversion is useful for the manipulation of the magnetization of a contiguous ferromagnetic layer (FM), using SOT, a promising mechanism for next-generation magnetic memories. The chosen SOC-materials were 2D transition metal dichalcogenides (TMD, such as MoS2 or WS2) and topological insulators (TI, with bulk insulating behavior and topologically-protected conductive surface states). Preparation of such SOC-material/graphene/FM heterostructures was carried out, in particular focusing on the optimization of the graphene/TI interface. Characterization of the interface proved that the insertion of graphene prevented both the oxidation at the surface of the TI and the intermixing with a ferromagnetic layer (permalloy, Py) grown on top. Coplanar waveguides and Hall bars were patterned from the aforementioned heterostructures and spin-torque ferromagnetic resonance measurements were carried out to study the spin-to-charge conversion efficiency. New insights about the system were gained and reported.

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз

Цел на проекта

Materials that exhibit two-dimensional transport are in the spotlight in the search for scalable systems and novel functionalities. By combining graphene, which possesses very large electronic mobility, with materials with large spin-orbit coupling, one expects to benefit from both of these properties for future practical applications in spintronics. In fact, the use of large spin-orbit coupling for conversion from charge to spin current, as well as the manipulation of the magnetization of ferromagnetic layers using spin-orbit torques (SOT), are the most promising mechanisms for the next generation of magnetic memories. Proximity spin-orbit coupling in graphene has been recently demonstrated by the host group. However, it is still poorly understood, it requires optimization and its envisioned applications are still to be explored. In the present project, we propose to investigate the proximity effect between graphene and materials exhibiting 2D transport and large spin-orbit coupling (2D-SOM) such as topological insulators (TIs) and transition metal dichalcogenides (TMDs), with a particular focus on the generation of large SOT.Our research program involves fabrication of 2D-SOM/graphene/ferromagnet heterostructures, including the growth of TIs using state-of-the art molecular beam epitaxy, device design, nanofabrication and characterization. The magnetization dynamics and the charge-to-spin conversion efficiency will be studied in these heterostructures using spin-torque ferromagnetic resonance. We will seek heterostructures that display large SOT. Their optimization will allow us to demonstrate full electrical magnetization reversal of a magnetic element via SOT. If successful, the outcomes of this work will advance the understanding of the proximity effect of graphene with 2D-SOM, as well as its influence on SOT, and will contribute to the unlocking of next-generation devices such as memories based on the exploitation of spin-orbit coupling.

Оригинален текст от CORDIS (на английски).

Участници

FUNDACIO INSTITUT CATALA DE NANOCIENCIA I NANOTECNOLOGIA · BELLATERRA (BARCELONA)КоординаторИспания