Program:
15.00-15.15: coffee & cake in the foyer
15.15-16.15: scientific talk in Auditorium I

Speaker: Prof. Lise-Marie Lacroix, LPCNO - UPS - Institut Universitaire de France

Abstract:
Magnetic materials play a major role in the current energy and societal transitions. However, the development of sustainable yet performant materials, without critical elements such as rare-earths (RE), remains a challenge. The bottom-up approach opens great potentiality for the rational design of efficient RE free magnetic materials, by the fine tuning of the intrinsic properties of individual particles, through their anisotropy, and their controlled assembly resulting in optimized collective properties [1].
We will present the chemical synthesis of nanoparticles (Figure 1) and the fine tuning of their magnetic properties thanks to size, shape and composition control [2]. Their applications as catalytic agents magnetically heated or as building blocks for integrated magnets will be discussed.

Figure 1. TEM images of Ni nanoparticles with different shapes, allowing for controlled magnetic properties

References:

1. “Magnetophoresis-Assisted Capillary Assembly: a Versatile Approach for
   Fabricating Tailored 3D Magnetic Supercrystals” P. Moritz et al. ACS Nano 15, 5096 (2021) 
   https://hal.science/hal-03210857

2. “Single-Crystalline Body Centered FeCo Nano-Octopods: From One-Pot Chemical
   Growth to a Complex 3D Magnetic Configuration” C. Garnero et al. Nano Lett. 21, 3664 (2021) 
   https://dumas.ccsd.cnrs.fr/X-PICM/hal-03201680v1