A collaboration between the technical hub, the clean room platform and the TELEM group at MPQ laboratory has developped a new experiment demonstrating that standard broadband ferromagnetic resonance can still be effective to probe the magnetization dynamics of “thin and tiny” magnets. The study is published in ACS Applied Electronic Materials.
(Left) Colorized tilted SEM image. Here ‘2D’ stands for Ø, Gr, WSe2 (in the 10 nm thick range). The yellow track is the gold RF antenna required for the FMR.(Right) FMR data of 6 x 10 µm2 x 13 nm Co grown on WSe2.
Using an original on-chip design and a Condorcet-made setup, Karen Sobnath et al. demonstrate the potential and versatility of their platform, by probing the magnetization dynamics of single Cobalt patch (of 6 x 10 µm2 surface down to thicknesses below 10 nm) grown on different 2D materials (such as hBN, Graphene and WSe2). It has moreover revealed a very peculiar behaviour: while the decoherence of Co, a key material in spintronics industry, diverges as expected with decreasing its thicknesses on hBN and graphene, it remains almost constant when interfaced with WSe2.
While these findings open up perspectives for advancements in STT-MRAM and opto-magnonics, this esquisse sensitivity furthermore establishes a compelling framework to probe the hitherto unexplored bidimensional magnetization dynamics.
Reference:
K. Sobnath, R. Bellelli, M. Rahimi, L. Chen, G. Wang, R. Bonnet, P. Filloux, M. Nicolas, B. Janvier, P. Lafarge, M. L. Della Rocca, P. Martin, C. Barraud, and F. Mallet
Contact: François Mallet
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