Journal ArticleDOI
Inductive measurement of ultrafast magnetization dynamics in thin-film Permalloy
TLDR
In this article, an inductive technique for the measurement of dynamical magnetic processes in thin-film materials is described using 50 nm films of Permalloy (Ni81Fe19) and data are presented for impulse and step-response experiments with the applied field pulse oriented in the plane of the film and transverse to the anisotropy axis.Abstract:
An inductive technique for the measurement of dynamical magnetic processes in thin-film materials is described. The technique is demonstrated using 50 nm films of Permalloy (Ni81Fe19). Data are presented for impulse- and step-response experiments with the applied field pulse oriented in the plane of the film and transverse to the anisotropy axis. Rotation times as short as 200 ps and free oscillations of the magnetization after excitation are clearly observed. The oscillation frequency increases as the dc bias field parallel to the anisotropy axis increases as predicted by classical gyromagnetic theory. The data are fitted to the Landau–Lifshitz equation, and damping parameters are determined as a function of dc bias field. Damping for both impulse and step excitations exhibits a strong dependence on bias field. Damping for step excitations is characterized by an anomalous transient damping which rapidly increases at low dc bias field. Transformation of the data to the frequency domain reveals a higher order precessional mode which is also preferentially excited at low dc bias fields. A possible source for both phenomena is precessional mode saturation for large peak rotations. The technique has the potential for 20 ps resolution, although only 120 ps resolution is demonstrated due to the limited bandwidth of the waveguides used.read more
Citations
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Journal ArticleDOI
Microwave assisted resonant domain wall nucleation in permalloy nanowires
TL;DR: In this paper, a system was designed to study microwave assisted domain wall nucleation in permalloy nanowires and the authors found a substantial decrease in the nucleation field when microwave fields are applied, in comparison to pulse fields.
Journal ArticleDOI
Magneto-optical spectrum analyzer
TL;DR: By combining a frequency domain approach with a micro focus Kerr effect detection, a high sensitivity to magnetization dynamics with submicron spatial resolution is achieved and allows spectra of single nanostructures to be recorded.
Journal ArticleDOI
Visualization of spin waves during switching simulation
TL;DR: In this article, a three dimensional "k-space window" is constructed for spin-wave switching, in which the coordinates are the wavevector components kx,ky, and kz.
Journal ArticleDOI
Vortex dynamics in nonparabolic potentials
Hauke H. Langner,Thomas Kamionka,Michael Martens,Markus Weigand,Christian F. Adolff,Ulrich Merkt,Guido Meier +6 more
TL;DR: In this article, a simple analytical model which includes isotropic and anisotropic deviations from a parabolic potential elliptical trajectories are calculated within a simple model, and the directions of these ellipses coincide with the experimental observations.
Journal ArticleDOI
Successful suppression of magnetization precession after short field pulses
TL;DR: In this article, it is demonstrated experimentally for ferrite films that the appropriate adjustment of the field pulse parameters and/or the static applied field may lead to full suppression of the magnetization precession immediately upon termination of a field pulse.
References
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