162561 20251017144608.0 doi 10.1103/fh7m-4p37 sideral 145052 ART-2025-145052 eng Ngouagnia Yemeli, I. Self-Modulation Instability in High Power Ferromagnetic Resonance of BiYIG Nanodisks 2025 Access copy available to the general public Unrestricted We study the high power ferromagnetic resonance of perpendicularly magnetized BiYIG nanodisks where the uniaxial anisotropy almost compensates for the shape anisotropy. We observe a strong saturation of the averaged magnetization upon moderately increasing the amplitude of the rf field and a broadening of the ferromagnetic resonance line toward lower and higher magnetic fields. Full micromagnetic simulations reveal that a self-modulation of the dynamic magnetization is responsible for this behavior. To get more insight into this unstable dynamics, we analyze it in terms of normal modes. The number of modes involved is found to rapidly increase above the critical threshold. Still, a normal mode model taking into account only a few of them and their mutual nonlinear couplings allows us to reproduce the observed phenomenon. The normal mode analysis and micromagnetic simulations also predict a Suhl-like instability at a larger excitation power, when it is slowly increased from low values, and bistability. Using two-tone spectroscopy, we directly measure the self-modulation spectrum and provide experimental evidence of bistable dynamics. These findings open some perspectives on using high dimensional dynamics in magnetic nanostructures for unconventional information processing. info:eu-repo/grantAgreement/ES/DGA/E13-23R info:eu-repo/grantAgreement/EC/H2020/899646/EU/k-space Neural computation with magnEtic exciTations/k-NET This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 899646-k-NET info:eu-repo/grantAgreement/ES/MICIU/CEX2023-001286-S info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Perna, S. Gouéré, D. Kolli, A. Sangiao, S. Universidad de Zaragoza (orcid)0000-0002-4123-487X De Teresa, J.M. (orcid)0000-0001-9566-0738 Muñoz, M. Anane, A. d’Aquino, M. Merbouche, H. Serpico, C. de Loubens, G. 2003 395 Universidad de Zaragoza Dpto. Física Materia Condensa. Área Física Materia Condensada 135, 5 (2025), 056703 [7 pp.] Phys. rev. lett. Physical Review Letters 0031-9007 2049584 http://zaguan.unizar.es/record/162561/files/texto_completo.pdf Postprint 3443721 http://zaguan.unizar.es/record/162561/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:162561 articulos driver 2025-10-17-14:16:09 ARTICLE