Interlayer coupling in spin valves studied by broadband ferromagnetic resonance

Autor:	Gonzalez-Chavez, D. E., Dutra, R., Rosa, W. O., Marcondes, T. L., Mello, A., Sommer, R. L.
Rok vydání:	2013
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevB.88.104431
Popis:	Magnetization dynamic response of coupled and uncoupled spin valves with structure NiFe(20 nm)/Cu(t_Cu)/NiFe(20 nm)/IrMn(10nm) were probed using broadband ferromagnetic resonance absorption measurements. By varying the Cu thickness t_Cu we were able to tailor the coupling intensity between the free and pinned layers. Broadband spectra show two resonant modes for each measured field. It is noticed that the coupling among NiFe layers modifies the amplitude of the absorption peaks and, moreover, the dispersion relations of the modes, which are distorted specially at the anti-parallel state. A numerical model is proposed and applied to address the underlying physics and the observed properties of these systems. Comment: 8 pages, 6 color figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1306.0915 Zobrazit plný text záznamu View this record from Arxiv