Amorfa skiktade filmer med optimerade magnetiska egenskaper
Tidsperiod: 2014-01-01 till 2016-12-31
Projektledare: Gabriella Andersson
Budget: 2 475 000 SEK
Aims of the project are to 1) understand why hard magnetic materials containing rare earths (RE) have their strong properties; 2) investigate theoretically and experimentally if similar properties can be achieved by deposition of amorphous compound films, multilayers or other heterostructures, with considerably smaller, or even zero, amounts of the most unavailable or controversial RE species; 3) optimize primarily hard magnetic properties on a small scale, with selected future applications in mind. Experimental methods will include sputter deposition of films and layers, structural characterization with x-rays (diffraction and absorption) as well as electron microscopy, and magnetic characterization with e.g. optical methods. Deposition will be done in a new efficient way that allows screening of several compositions on one large substrate, for compounds of 2-4 different elements (combinatorial sputtering). Complementary theoretical work will include implementation of a novel computational approach for addressing the properties of amorphous magnetic solids and multilayers: a combination of atomistic spin dynamics and the recently developed stochastic quenching method. The search for strong magnets (permanent magnets) with little or no RE content is a world-wide concern, since there are both political and environmental issues around these elements. Also, we will contribute to a deeper understanding of magnetic amorphous compounds on the atomic scale, also for soft magnets.