Verónica Salgueiriño

The incorporation of magnetic nanostructures into a nano/micromotor design is a very convenient strategy for magnetic actuation. Accordingly, herein, some advantages with which self-propelled swimmers become endorsed when including magnetic nanoparticles in the final assembly, will be detailed.

One one hand, we can consider the basic physical mechanism by which a magnetic field can be used to generate motion in fluidic environments, namely by inducing the so-called magnetophoretic motion by applying forces due to the magnetic field gradients, which require a spatially inhomogeneous field. Furthermore, this effect can be exploited jointly with self-propulsion of swimmers, such that, the movement becomes directed (Schattling et al. ACS Nano, 2017).

On the other hand, we can also take into account the ability of magnetic nanoparticles to deliver heat, via the external stimulation using an alternating magnetic field. This heat delivered can have a tremendous impact in the self-propulsion, as it can be employed to catalyse the reactions involved in the concentration gradient generating the movement (Ramos-Docampo et al. ACS Nano, 2019).

Biography:

Verónica Salgueiriño obtained her Ph.D. degree in 2003. Her work, supervised by Luis M. Liz-Marzán, focused on silica-coated gold nanoparticles in particular ordered arrays, which allowed the study of the optical properties displayed. After two years of post-doc, first in Universität Duisburg-Essen (Germany) (group of M. Farle), then in Ira A. Fulton School of Engineering - Arizona State University, (USA, group of R. Díaz), she joined the Nanomag Group (Universidade de Santiago de Compostela, group of J. Rivas / M. A. López-Quintela) as a IPP researcher to work on incorporating diverse functionalities into a single nanoparticle. In 2008 she was awarded the L’Oréal-UNESCO (Women in Science) National Award. In March 2009 she joined the Universidade de Vigo as a Ramon y Cajal fellow leading the Magnetic Materials group she initiated. She is associate professor at the department of Applied Physics, since May 2017.

Email:

Address:Dpto. de Física Aplicada, Universidade de Vigo Spain, Lagoas-Marcosende, Vigo, Galicia, Spain, 36310

Mathias Klaüi

With information technology consuming a sizeable part of the total energy, “GreenIT” information storage and computing technology will have a major impact to address societal challenges.

Traditionally, magnetism has been the prime approach to non-volatile data storage and spintronics devices for memory and sensing have been realized. However so far, spintronics is linked inextricably to ferromagnets in metals entailing major disadvantages, such as ohmic losses during operation and unwanted interactions due to stray fields. A possible novel approach is to use antiferomagnets. While known for a long time, antiferromagnetically ordered systems have previously been considered, as expressed by Louis Néel in his Nobel Prize Lecture, to be “interesting but useless”.

However, since antiferromagnets potentially promises faster operation, enhanced stability with respect to interfering magnetic fields and higher integration due to the absence of dipolar coupling, they could potentially become a game changer for new spintronic devices.

I will introduce the key operations of reading and writing the antiferromagnetic order to store and retrieve information and how to transport information using low loss spin currents. Reading can be achieved in metallic as well as insulating antiferromagnetic heterostructures using special magnetoresistance effects and efficient switching of antiferromagnets has been demonstrated by spin orbit torques. Spin currents have been shown to carry information with unprecedented efficiency in the insulating antiferromagnet hematite, the main component of rust showing that very common materials can be used in unexpected ways!

Biography:

Mathias Kläui is professor of physics at Johannes Gutenberg-University Mainz and adjunct professor at the Norwegian University of Science and Technology. He received his PhD at the University of Cambridge, after which he joined the IBM Research Labs in Zürich. He was a junior group leader at the University of Konstanz and then became associate professor in a joint appointment between the EPFL and the PSI in Switzerland before moving to Mainz. His research focuses on nanomagnetism and spin dynamics on the nanoscale in new materials. His research covers from blue sky fundamental science to applied projects with major industrial partners. He has published more than 260 articles and given more than 200 invited talks. He is a Senior member of the IEEE and has been elected to the technical and administrative committees of the magnetics society. He is also a Fellow of the IOP and has been awarded a number of prizes and scholarships.

Email:

Address:Johannes Gutenberg-University, , Mainz, Germany