Chimie du Solide et Matériaux

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Conference Nora DEMPSEY 05/10/2017 11h Amphi Bât. 10B

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Development of micron-scaled magnetic flux sources for bio-and MEMS applications

05/10/2017 - 11h, Université de Rennes 1, Beaulieu, Campus de Beaulieu - Amphi D. Grandjean - Bâtiment 10B

Nora DEMPSEY
Institut Néel, CNRS & Univ. Grenoble Alpes, Grenoble (France)

Contact : Pierric Lemoine (3 33 06) - pierric.lemoine@univ-rennes1.fr

For the same reasons that Rare Earth – Transition Metal (RE-TM) magnets are attractive for use at the macro-scale (high energy density, contactless actuation, stability…), they are also very appealing for use at the micro-scale. Furthermore, the magnetic field gradients produced by a permanent magnet scales up as the size of the magnet scales down, resulting in an increased force per unit volume. There is thus great potential for using high performance RETM based micro-magnets in a wide range of applications.
In this talk I will briefly review our work on the development and micro-patterning of hard magnetic films and the low-cost fabrication of micro-magnet arrays based on hard magnetic powders. I will present a Scanning Magneto-Optic-Kerr-Effect system that incorporates an original pulsed magnetic field source, developed for the high throughput non-destructive characterisation of coercivity across compositionally graded hard magnetic films. I will then describe recent advances made in the quantitative characterisation of stray fields and forces produced by micro-magnets using Scanning Hall Probe Microscopy and Magnetic Force Microscopy with specially designed probes. Finally I will give examples of bio-medical applications of the micro-magnets we have developed.