Magnon Spin Current Modulation through Site-Specific Doping in a Compensated Iron Garnet

2025/08/05 by Francis, Anna Merin, P. B. S. Murthykrishnan, R. Kolay +6
Engineering · Materials Science · Physics and Astronomy · #FOS: Physical sciences #Magneto-Optical Properties and Applications #Materials Science (cond-mat.mtrl-sci) #Multiferroics and related materials #Physics of Superconductivity and Magnetism #Strongly Correlated Electrons (cond-mat.str-el)

paper · pdf · doi:10.48550/arxiv.2508.03378

openalex publication_date 2025/08/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We report on the impact of manganese doping at the iron sites in Gadolinium Iron Garnet (GdIG, Gd₃Fe₅O₁₂), employing temperature-dependent spin Seebeck effect and ferromagnetic resonance measurements. Our findings reveal a clear shift in the magnetic compensation temperature (T_comp) in Mn-doped GdIG, with minimal changes observed in the magnetic and damping properties. Notably, the spin Seebeck signal strength was enhanced significantly with the Mn doping. This enhancement is attributed to an increased spin mixing conductance and modifications in the magnon spectra that strengthen exchange interactions, highlighting the material's potential for room-temperature spintronic applications.

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