SAMSFERE · Self-Assembled Monolayers over Ferromagnetic Electrodes for Organic Spintronics
7РП — „Хора“ (Действия „Мария Кюри“)
- Период
- 2012-12-01 → 2015-11-30
- Финансиране от ЕС
- 75 000 €
- Участници
- 1
- Схема
- MC-CIG
Линиите свързват координатора с партньорите.
Накратко на български
Органичните магнитни превключватели се изследват чрез поставяне на тънки молекулярни слоеве върху ферромагнитни електроди. Тези структури помагат за разбирането на управлението на електронния спин, което е основа за създаването на по-ефективна памет и нови видове светодиоди.
Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.
Резултати накратко
Self-Assembled Monolayers over Ferromagnetic Electrodes for Organic Spintronics
The objective of this reporting period was to continue and deepen the study of the Self-assembled Monolayers-based organic magnetic tunnel junctions designed during the first part of the project. Following our previous pioneering work on the functionalization of LSMO with alkylphosphonic acid, we studied the influence of SAMs grafting on the electronic properties of LSMO using photoemission and absorption spectroscopies (XPS, UPS and XMCD) (Galbiati et al. Appl. Surf. Sci. (2016)). LSMO//SAM/Co, (SAM = alkylphosphonic acid, n = 10, 12, 14, 16, 18) spintronic devices showed an exponential increase of tunnel resistance as a function of alkyl chain length, this is a direct proof of the successful connection of the molecules to the ferromagnetic electrodes. For all the alkyl chains studied we obtained stable and robust tunnel magnetoresistance, with effects up to 250% at low temperature (Tatay et al. J. Phys. Condens. Matter. (2016)). Using our recently developed method to recover oxidized ferromagnetic metal surfaces (Tatay et al. AIP Advances. (2015)) without altering interfacial properties we have integrated SAMs into organic room temperature MTJs using Py and Co as ferromagnetic electrodes. We have obtained some promising results and measured magnetoresistance signals at room temperature on some of these devices. In general NiFe-based MTJ showed more reliable (less ratio of short-circuited contacts) and displayed higher TMR signals when compared to Co-based MTJs. Moreover, we have integrated some of these SAM-ferromagnetic metal systems into light-emitting diodes. With this aim we designed and studied the electroluminescent devices with ITO/Py//SAM/F8BT/MoOx/Metal structure (M6/M7, F8BT = Poly(9,9-dioctylfluorene-alt-benzothiadiazole)). Similar structures (ITO/ZnO//F8BT/MoOx/Metal (ZnO = Zinc Oxide)) have previously tested at the ICMol and showed low on-set voltages. We first used gold as top electrode. Some of our devices shined light above 4 V, the wavelength of the emitted light closely resembled F8BT emission spectra. The system without SAM showed increased turn-on voltage. These results confirm the feasibility of using SAMs for the construction of spin-OLEDs. The next step will be to include Co as the top ferromagnetic to perform magnectotransport measurements on these devices. Website http://www.uv.es/taser
Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз
Цел на проекта
Organic materials offer unique properties like: i) processablility and plastic technology compatibility, ii) monodispersity and tunability and iii) long time spin coherence that make them appealing for spintronics devices and hence, a great number of proposals exits about its use in spintronics applications. Nevertheless, organic spintronics is in its infancy and so far only a small number of different organic materials have been used in spintronic research to realize an even smaller number of this proposals. First reports on the integration of organic materials into spintronic devices date back to 2002. Self-assembled monolayers with their special characteristics are an invaluable tool set for the developing and understanding of spin transport. As tunnel barriers SAMs i) Can be easily engineered: Are modular and their parts can be exchanged while keeping the others unchanged, ii)Are intrinsically nanometre thick: Film thickness will be determined by molecule size and SAM structure, iii) Have defined structures: SAM formation is a self-assembly process, structure is preprogramed and iv) Are promising to candidates to work at high-bias. SAMSFERE aims to expand the current know-how in the field of organic spintronics and lay the base of a solid understanding of the spin-transport through interfaces by the growing of a completely new set of SAMs over FM electrodes that will be employed in the development of devices based on magnetoresistive effects(organic magnetic tunnel juntions) and beyond (spin organic light-emmiting diodes).
Оригинален текст от CORDIS (на английски).
Участници
- UNIVERSITAT DE VALENCIA · ValenciaКоординаторИспания
Връзки
Данни: CORDIS, © Европейски съюз