Two ICMAB reserachers from the NN group have been granted LLAVOR projects to develop novel electromagnetic wireless power transfer technologies in medical devices, and to see the effect of millimeter waves on the reverse-magnetization of ε-Fe2O3 films.
The "Knowledge Industry Grants, Modality A: LLAVOR" are devoted to innovative projects with the potential to be incorporated into the productive sector and are awarded by the Department of Research and Universities (Generalitat de Catalunya) - Agency for Management of University and Research Grants (AGAUR).
This LLAVOR projects are for 9 months and are granted with 20,000 €. The 2 LLAVOR projects awarded to ICMAB researchers are:
Scheme of the Charge TheM project | Pablo Guardia
Martí Gich, from the Nanoparticles and Nanocomposites (NN) group, ICMAB, CSIC
"The aim is to show that when millimeter waves are applied to ε-Fe2O3 films the magnetic field needed to reverse its magnetization is significantly lower than without mm-waves." says Martí Gich. "The challenge is preparing films displaying ferromagnetic resonances (FMR) at the frequencies that are experimentally available to us. In this case to show the proof of concept we are focusing on the 50 GHz range instead of in the 180 GHz region where we find the FMR of ε-Fe2O3 (in the field of radiofrequency the prices and the challenges increase with the frequency). So we will have to prepare films with metal substitutions to lower the FMR. Another technical challenge is being able to locally “read” the film magnetization state while mm-waves are applied to it. Some ideas to do this are using the inverse Hall effect or magnetoptics."
Improving the energy efficiency of computers is mandatory for making sustainable the exponential rise of data processing and storage. A critical step to confront this challenge is developing novel, fast, low-dissipative and ultrahigh density magnetic recording media. The project aims at providing a proof of concept for εε-Fe2O3-based ferrites as a novel system to implement ultrahigh density recording media. In particular, we will evaluate if applying millimeter-waves or sub-THz pulses can significantly reduce the magnetic fields needed to switch the ferrite film magnetization, decreasing the energetic consumption of information writing operations. The improved switching efficiency relies on the excitation resonant modes by pulses of these frequencies transmitted through coplanar waveguides, which will be used to assist the local switching of magnetization by small bias fields.
The proposed solution is an oxide-based alternative to state-of the art ultrahigh density recording media based on FePt alloys. The demonstration of a new approach to the assisted switching and the introduction of ferrites can greatly enhance the performance of this recording technology, in terms of switching time, power consumption and packing density. The project results could be important in the long term for novel computer architectures the integrating non-volatile memories in all-oxide spintronic or magnonic computing devices. Thus, its potential impact in information technologies is huge.
Resolució de concessió dels ajuts d'Indústria del Coneixement per a l'any 2021 (Llavor i Producte). Modalitat A. Ajuts Llavor per a projectes innovadors amb potencial d’incorporació al sector productiu (5056R22).