Small Amplitude Dynamics of Nonhomogeneous Magnetization Distributions: The Excitation Spectrum of Stripe Domains

Microwave spectroscopy on magnetization reversal dynamics of nanomagnets with electronic detection

“…In the same vacuum cycle, four aluminum fingers are deposited that form clean contacts with the Co strip ( Fig.1 (b)). The microwave field is perpendicular to the plane of the sample and the equilibrium direction of the magnetization, which is a condition for driving the FMR [11]. The CPW is connected to a microwave signal generator via microwave probes with 40 GHz bandwidth.…”

Precessional frequency of ferromagnetic elements: Influence of magnetic domain width

“…2a-c for an extended film and two stripes with different domain width. This damped oscillation is kicked off by the additional field h pulse and not continuously forced and excited as in regular ferromagnetic resonance (FMR) experiments, in which a steady rf-field is applied [6,7]. In this sense the effect may be considered as a free oscillation.…”

“…As explained in the reviews [6][7][8][9] (cf. also the references therein) the most important modes governing the spin dynamics in patterned structures are: (i) domain-wall boundary oscillations, (ii) the rigid motion of the magnetization within a domain (macro-spin model) and (iii) excitation of an inhomogeneous spin distribution within a domain.…”

Modal spectrum of permalloy disks excited by in-plane magnetic fields

“…In recent years substantial effort has been put into the identification of the excitation spectrum of small ferromagnetic elements [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] and into the investigation of their switching behavior in the precessional regime. [21][22][23] While these problems can be addressed in the frequency domain using Brillouin light scattering ͑BLS͒ or ferromagnetic resonance ͑FMR͒ methods, 3,24,25 time resolved scanning Kerr microscopy ͑TR-SKEM͒ experiments 4,12,26 or microfocus BLS ͑Refs. 20 and 27͒ now offer the opportunity to observe magnetic excitations on the picosecond time scale directly.…”