Julian Gonzalez is Professor of Applied Physics in the Department of Materials Physics of the UNiviversity of the Basque Country in San Sebastián (Spain). He is the head of the Magnetic Group and its research interest is very broad covering materials physics, nanotechnology, magnetic studies, novel amorphous, nanocrystalline and nanogranular ferromagnetic materials; magnetic sensors; magnetoelastic effects; magnetotransport phenomena: magnetoresistance, magnetoimpedance at high frequency and ferromagnetic resonance; metamaterials at GHz range; spintrónic: (Dynámics of magnetic vortix); magnetocaloric and shape magnetic memory materials; micromagnetic modelling and simulation.
Prof. Gonzalez has published over 400 research publications and his research work has high impact in the scientific community. His publications have been cited thousands of times. He has supervised eleven PhD theses and three more are currently underway. He has supervised 24 research projects where he was as principal investigator in 15 of them. He organized the III Joint European Magnetic Symposia (JEMS) Conference and five international workshops, several national meeting and participated in the Scientific Committee of more than 10 conferences. He has delivered 47 presentations and has been invited to 32 conferences. On an international level, he has been referee for many scientific journals and the Guest Editor for several journals including the Journal of Magnetism and Magnetic Materials, Journal of Nanoscience and Nanotechnology, Physica Status Solidi (a): Applied Physics, Physica B: Condensed Matter in the field of magnetic nanomaterials demonstrating his excellent and outstanding world-wide reputation in the field of his research expertise.
His Topic of Materials' Days 2011:
Magnetic and Magnetotransport Properties of Glass Coated Microwires
Glass-coated microwires obtained by a quenching-and-drawing technique (also labelled Taylor-Ulitovsky method) have attracted the attention in the last recent years regarding their magnetic, magnetoelastic and magnetotransport properties as well as their promising technological applications. These microwires consist of a metallic nucleus covered by a Pyrex-like these new magnetic microwire-shaped materials result to be very adequate materials to investigate fundamental aspects concerning the mechanisms governing their macroscopic magnetic properties. In this work we will present a deep analysis on the microstructural characterization of several glass-coated microwire compositions, which initially present amorphous and nanogranular character. These microwires are submitted to careful thermal treatments to develop the nanostructures leading to a very soft magnetic behaviour linked to interesting magnetotransport response Special attention has been paid to the geometry (ratio between the total diameter and diameter of the metallic nucleus) and compositions of the metallic nucleus. The role of the complex internal stresses arising from the different dilatation coefficient between the metallic nucleus and the insulating sheath results to be as one of the most important factor to understand the magnetic properties of these nanostructired microwires. The magnetic behaviour is overviewed in terms of the nanosize dimensions. Some real and potential applications are also commented.