Oscar Céspedes

Oscar is an academic at the University of Leeds that pursuits the use of sustainable materials and technologies in electronics and computing. His research pursuits a multidisciplinary approach to nanotechnology and information storage, aiming to discover new paradigms arising from the combination of spin, molecular materials and quantum effects.

After graduating from the Physics department at the University of Zaragoza (Spain), Oscar became an intern at the National Laboratory of Intense Magnetic Fields (LNCMP) in Toulouse (France) as a research Erasmus scholar. During this time, he studied the electron-magnon (spin wave) interaction by doing simulations and measurements of the magnetoresistance of 3d transition metals at high magnetic fields (5-60 T), successfully determining the physical parameters for the magnons and their interaction with electrons.

He later joined the Physics Department at Trinity College Dublin to do a PhD under the supervision of Prof. JMD Coey. Initially he worked in the European project MAGNOISE, working on noise measurements in half metallic films and nanostructures. The excellence of research in spintronics at Trinity College was then recognised by two €5M grants by Science Foundation Ireland: CINSE and CRANN. Oscar was involved in both projects, contributing with the discovery of a magnetic proximity effect, or contact induced magnetism in carbon nanotubes (reported here in Physics World and one of the top papers in 2004 in J. Phys. Cond. Matt.) and performing the first measurement of electrically induced domain wall displacement in magnetic oxides using focused ion beam patterned Fe3O4 and LSMO nanoconstrictions.

After his doctoral work, Oscar took a position as European Young Researcher at the Atomic Energy Commission of France (CEA-Saclay) within the European network DYNAMICS. Working with Dr. Michel Viret, Oscar measured the experimental proof of magnetism in atomic platinum chains and fabricated a p-Si / NiOx diode with rectifying, tuneable magnetoresistance and photovoltaic properties. His second postdoctoral position was at the Department of Applied Quantum Physics at Kyushu University (Fukuoka, Japan). His research during his first year granted him a fellowship by the Japan Society for the Promotion of Science fellow for the following two years. In Japan, Oscar worked in the effects of RF magnetic fields on iron cage proteins and the optical properties of magnetite nanoparticles. The most remarkable result was the first proof of a non-thermal biological effect of RF magnetic fields, with protein function and molecular dynamics altered after exposure to fields of order 1 MHz and 15 mT (refs [1,2] and reported here and here by EMF-Portal).

His research on an emergent magnetism at molecular interfaces featured in Nature (link), with a News report in their front website (link) and a News & Views article in the same journal issue reporting the findings (link). This research was also widely reported by other sources, such as Cosmos Magazine, Physics World, Chemistry World, Science News and others. This work lead as well to the design of a spin singlet to triplet Cooper pair interface, where magnetism and superconductivity co-exist in metallo-molecular multilayers.

More recently, his work has focused on the realisation of a spin capacitor, a device for the storage of spin polarised charge, and the tuning of anisotropy and spin orbit coupling using molecular layers.