Observation of nonlinear FMR in amorphous microwires using standard x-band spectrometer

0469170 - FZÚ 2020 RIV SK eng J - Journal Article
Kraus, Luděk
Observation of nonlinear FMR in amorphous microwires using standard x-band spectrometer.
Journal of Electrical Engineering - Elektrotechnický časopis. Roč. 66, č. 7 (2015), s. 70-73. ISSN 1335-3632. E-ISSN 1339-309X
R&D Projects: GA ČR GAP102/12/2177
Institutional support: RVO:68378271
Keywords : ferromagnetic resonance * amorphous microwires * nonlinear phenomena * spin waves
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 0.407, year: 2015
Method of publishing: Limited access

Experimental technique for investigation of nonlinear ferromagnetic resonance in thin metallic wires is described. It uses a simple home-made X-band FMR spectrometer with static magnetic field and microwave electric field parallel to the wire. Electric polarization of the wire induces microwave current and large circumferential AC magnetic field on the wire surface. This reduces the critical power for the onset of nonlinear effects. Moreover, in Fe-rich amorphous metals the condition of coincidence of the main and the subsidiary resonances is satisfied at X-band frequencies which further reduces the critical field for the onset of insta-bility. Then the microwave power of few mW is sufficient for observation of nonlinear FMR. The nonlinear resonance curves of very thin wires show well distinguished fine structure with the period inversely proportional to the wire diameter.
Permanent Link: http://hdl.handle.net/11104/0267013