Institut NEEL, CNRS & Univ. Grenoble Alpes, Grenoble
Abstract:
Rare Earth – Transition Metal (RE-TM) permanent magnets are used in applications that require magnets with very high energy densities and/or high coercivities. A domain of application of major and growing importance concerns high performance motors, such as the motors used in hybrid electric vehicles and those used in gearless wind turbines. Following recent issues with the sourcing and pricing of RE metals, much effort is now going into reducing and ultimately eliminating the need for Dy in the Nd-Fe-B based magnets, and to develop high performance magnets with reduced RE content. At the same time, there is great potential for the use of high performance RE-TM micro-magnets in micro-systems, with applications in the fields of bio-medicine, information technology, energy transformation/management, etc.
In this presentation I will report on the preparation and study of RE-TM films that serve as model systems to study the crucial link between micro-structure and magnetic performance in these materials. I will describe a combinatorial approach to sample preparation and characterisation, including the development of a scanning MOKE system with intense magnetic fields, for high throughput screening of materials. As way of example, I will describe an on-going study of 1:12 based materials. I will then present techniques that we’ve developed for the micro-patterning of RE-TM hard magnetic films and approaches we use for the characterization of stray fields and forces produced by these micro-magnets on test objects. Finally, I will give some examples of applications of RE-TM micro-magnets.
In this presentation I will report on the preparation and study of RE-TM films that serve as model systems to study the crucial link between micro-structure and magnetic performance in these materials. I will describe a combinatorial approach to sample preparation and characterisation, including the development of a scanning MOKE system with intense magnetic fields, for high throughput screening of materials. As way of example, I will describe an on-going study of 1:12 based materials. I will then present techniques that we’ve developed for the micro-patterning of RE-TM hard magnetic films and approaches we use for the characterization of stray fields and forces produced by these micro-magnets on test objects. Finally, I will give some examples of applications of RE-TM micro-magnets.
Related Links:
