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Report

Teaser, summary, work performed and final results

Periodic Reporting for period 1 - SPICOLOST (Spin conversion, logic storage in oxide-based electronics)

Teaser

Summary

Many of the current challenges in the rational and efficient use of the energy extend to whole classes of electronic devices. For these, energy harvesting, energy savings and energy conversion are key concepts that should be exploited. The present project is addressing those challenges by designing materials in which various energy reduction schemes can be implemented. We envision cutting edge nanotechnology, to produce oxide and superconducting materials for spintronics technologies in the SPICOLOST framework. The projectâ€™s technical work will follow two main parallel approaches:
1) Exploiting suitable heterostructures for high-efficiency conversion of thermal- into electrical energy, taking the advantage of harvesting, in the so-called thermoelectric thermopile device based on the Seebeck and Spin-Seebeck Effects;
2) Producing multicomponent nanostructured materials for magneto-electronic and superconducting devices, capable of fast signal processing, and minimizing the energy dissipation by proper control of the magnetic switching, thus consuming less energy.
We anticipate providing advances in experimental fabrication processes, improvements in the control of interface properties of hybrid heterostructures. The project may substantially improve the quality of life of the European population, by stimulating the innovative technologies of efficient use of energy deeply penetrated into the modern world. The fundamental study of this processes in multiferroic materials and of the electrical plasticity of oxides will substantially enhance the European know-how in the application of these materials in digital circuits with sustainable reduce of energy consumption. Stimulation of the interest of the R&D EU community in the area of materials applications for energy saving will guarantee the Project social outcome.

Work performed

WP1: WP objectives were completed and reported in deliverables 1.1, 1.2, and 1.3.
1) Films obtained by PLD/sputtering: MgO/Fe3O4/Pt (Fig. 1), SrTiO3/CaMnO3, SrTiO3/LaMnO3, SrTiO3/(LaSr)MnO3
2) Films obtained by PAD: BiFeO3, BiFeO3:Co, Ni, Cu, Mn; CrO (Fig.2)
3) Nanoparticles: Fe3O4, and Fe3O4 coated with MgO, CoO, ZnO and CoFe2O4, Fe3O4/ZnFe2O4, Fe3O4/ZnxCo1-xFe2O4
This work was done with the participation of CNRS, UNIZAR, USC, CNEA, UTN, Empa and UNSAM.
WP2: Conventional and advanced characterization by XRD, SEM, TEM, STEM, EELS, EDX, of films and nanoparticles for energy applications, tunnel magnetoresistance and multiferroics, were implemented in this WP. Samples prepared in WP1 were characterized in several laboratories of the consortium and task and deliverables 2.1 and 2.4 were done for obtaining information about the process, this work was done with the participation and secondments between of UNIZAR, CNEA, UTN, CNRS, and USC.
WP3: Energy Converter Devices fabricated with multilayer heterostructures with high spin-to-charge conversion. The Task 3.1 was accomplished; samples prepared by several groups of the consortium were measured at AIMR and UNIZAR. The Task 3.2: Measurement of Seebeck Effect and thermal conductivity of multilayers are partially fulfilled since thermal conductivity measurements were difficult to obtain with reproducibility. One way to solve this task is collaborating with other groups or to invite for participating in the Consortium a new laboratory from Carnegie Mellon University (USA) with which USC has already collaboration. The rest of deliverables of this WP were achieved successfully and reported.
WP4: this WP was dedicated to work in the optimization of magnetic oxides and HTCS growth onto silicon substrates for future using in Si-electronics. Samples grown by Pulsed Laser Deposition were prepared using different buffers and varying deposition parameters. The PLD deposition of YSZ/CeO2/La0,67Sr0,33MnO3 (Fig. 3a), YSZ/CeO2/SrTiO3/BaTiO3 (Fig.3b) and HTCS YBa2Cu3O7 (YBCO) was successfully achieved onto Si substrates. This work was done with the participation of CNRS, CNEA, UNSAM, USC. Advances in Task 4.1, 4.2, and 4.3 were done by secondments CNEA/CNRS and CNEA/UNIZAR.
WP5: The task 5.1 was advanced in a Bilateral Memorandum of Understanding between UTN and UNIZAR for co-supervising PhD thesis. The task 5.2 and D5.2 was in progress with the celebration of 2 workshops of the 3 planned during the project. The task 5.4 on Dissemination was widely fulfilled with several participation in the media (radio, TV, YouTube, newspapers) general press release: 27; trainings (3 technicians, 4 PhD and 4 postdocs); 8 scientific publications (1 accepted and 7 published from results of WP1, 2, 3, and 4); 2 organization of conferences/workshops; 11 participation in conferences, 15 participation in workshops and 9 events different from conferences and workshops. A detail of dissemination is included as a table in Images attached to the Summary for publication.
WP6: Management in the Administrative, financial and legal strategies. The management was followed by periodical meeting of coordination, regarding the scientific and administrative field. There was celebrated 5 internal meetings describe in the table Dissemination. Regarding the realization of secondments it was evaluated not only in scientific terms, that was quite successful but also the number of execution of secondments. We can show that UNIZAR has used 100% of secondments planned during the first 2 years; CNRS completed 80%, USC 72% and Empa 23% of secondments. Unfortunately, some institution is not able to complete all secondments, this case corresponds to the illness of the PI. We will propose a redistribution of secondments, 1) to take part more actively in the experiments that have to be done in Empa, 2) because of the participation of students with co-supervising PhD thesis between institutions of Europe and Third countries; 3) to solve proble

Final results

Many progresses were done in several fields that are core objectives of this project:
1) Synthesis and characterization of Nanoparticles (NP), bimagnetic NP with single and core-shell structure with two papers published in 2019, with enormous progress as well, in the production of devices built with NPs. Different combinations of soft/hard and hard/soft core/shell configurations can be envisaged for optimizing devices with the required magnetotransport response. (WP1, WP2, WP4)
2) We were successful in the integration of magnetic oxides and HTCS on Si substrates, to make compatible our device with standard Si-electronics. This opens up the possibility to include these types of materials in a new set of electronic devices, developing a new spectrum of different functionalities. (WP1, WP4)
3) The Spin Seebeck Effect was achieved in multilayers systems of Fe3O4/Pt. This work paves the way to more efficient thermal-conversion devices using spin currents, and encouraging the deeper understanding of spintronics. (WP1, WP2, WP3)
4) Regarding training new capacities researchers got quality training on their specialties, highly required but not available in their home institutions. We consider that may substantially improve the life quality of the European population, by producing devices with low energy consumption and with the proper dissemination, (see table on Dissemination). (WP5, WP6)