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Magnetism and superconductivity seminar

Seminarium z Magnetyzmu i Nadprzewodnictwa Hybrydowo

Ferromagnetic resonance in a magnetically dilute percolating ferromagnet: An experimental and theoretical study

15-10-2025 10:00 - 11:00
Venue
Institute of Physics PAS, Room 203, Building I
Email
This email address is being protected from spambots. You need JavaScript enabled to view it.
Speaker
MSc. Yadhu Krishnan Edathumkandy
Affiliation
Institute of Physics, Polish Academy of Sciences
Sala
Room 203, Building I

To view the recording of the talk, please contact Prof. Andrzej Szewczyk: This email address is being protected from spambots. You need JavaScript enabled to view it.

Ferromagnetic resonance (FMR) serves as a powerful probe of magnetization dynamics and anisotropy in percolating ferromagnets, where short-range interactions govern long-range magnetic order. We apply this approach to Ga1−xMnxN (x ≃ 8%), a dilute ferromagnetic semiconductor, combining FMR and superconducting quantum interference device magnetometry. Our results confirm the percolative nature of ferromagnetism in (Ga,Mn)N, with a Curie temperature TC = 12 K, and reveal that despite magnetic dilution, key features of conventional ferromagnets are retained. FMR measurements establish a robust uniaxial anisotropy, dictated by Mn3+ single-ion anisotropy, with an easy-plane character at low Mn content. While excessive line broadening suppresses FMR signals below 9 K, they persist up to 70 K, indicating the presence of non-percolating ferromagneticclusters well above TC. The temperature dependence of the FMR intensity follows that of the magnetization, underscoring the stability of these clusters. We quantitatively describe both FMR and SQUID observables using atomistic spin model operating on a common set of parameters. The level of agreement, achieved without tuning parameters between datasets, demonstrates the robustness and practical applicability of the approach in capturing the essential physics of spin-diluted, percolating ferromagnets. This study advances the understanding of percolating ferromagnetic systems, demonstrating that FMR is a key technique for probing their unique dynamic and anisotropic properties. Our findings contribute to the broader exploration of dilute ferromagnets and provide new insights into percolating ferromagnetic systems, which will be relevant for spintronic opportunities.

 The lecture will be on-site in room 203. ZOOM transmission will be available too.

Zoom information.

 
 

List of Dates (Page event details)

  • 15-10-2025 10:00 - 11:00
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