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
Impact of eddy currents on the dispersion relation of surface spin waves in thin conducting magnetic films
TL;DR: In this paper, the impact of eddy currents on the dispersion relation of surface spin waves propagating in thin conducting magnetic films was investigated and it was shown that the increase in the inplane component of the dynamic magnetic field within the conducting film is associated with a drastic change in the asymmetry of the modal profiles for the waves.
Journal ArticleDOI
Gilbert damping in NiFeGd compounds: Ferromagnetic resonance versus time-resolved spectroscopy
Ruslan Salikhov,Ruslan Salikhov,Alexandr Alekhin,T. Parpiiev,Thomas Pezeril,Denys Makarov,Radu Abrudan,Radu Abrudan,Ralf Meckenstock,Florin Radu,Michael Farle,Hartmut Zabel,Vasily V. Temnov,Vasily V. Temnov +13 more
TL;DR: In this article, the dependence of Gilbert damping on the Gd concentration in ferromagnetic thin films was investigated using FMR, element-specific time-resolved x-ray magnetic resonance, and femtosecond magneto-optical pump-probe techniques.
Journal ArticleDOI
Spin waves interference from rising and falling edges of electrical pulses
TL;DR: In this article, the authors investigated the effect of the electrical pulse width of input excitations on the generated spin waves in a NiFe strip using pulse inductive time domain measurements and provided conditions for obtaining spin wave packets with maximum intensity at different bias conditions.
Journal ArticleDOI
Impact of eddy currents on the dispersion relation of surface spin waves in thin conducting magnetic films
TL;DR: In this article, the impact of eddy currents on the dispersion relation of surface spin waves propagating in thin conducting magnetic films was investigated and it was shown that the acceleration of the spin wave frequency is due to an increase in the in-plane component of the dynamic magnetic field within the conducting film.
Magnetization dynamics in coupled magnetic systems
TL;DR: In this article, the authors investigated the magnetization dynamics in coupled magnetic systems using broadband ferromagnetic resonance and Brillouin light scattering techniques, and observed and characterized the coupling and relaxation mechanisms between magnons and electrons in semiconductors.
References
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Book
Introduction to solid state physics
TL;DR: In this paper, the Hartree-Fock Approximation of many-body techniques and the Electron Gas Polarons and Electron-phonon Interaction are discussed.
Journal ArticleDOI
A Mechanism of Magnetic Hysteresis in Heterogeneous Alloys
Edmund C. Stoner,E. P. Wohlfarth +1 more
TL;DR: In this paper, the effect of shape anisotropy on magnetization curves was studied for the case of ellipsoidal spheroids of revolution (e.g., ellipses of revolution).
Book
Theory of Magnetic Recording
TL;DR: This paper presents a simulation of the playback process of the magnetostatic fields of magnetoresistive heads, a very simple and straightforward way of cataloging the fields and their properties.
Book
Handbook of microwave integrated circuits
TL;DR: Hoffmann et al. as mentioned in this paper presented the Handbook of microwave integrated circuits (HOLA) for the purpose of measuring the pressure fields using covariance and spectral proper transformations.