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
Ultrafast Spin Dynamics
TL;DR: In this paper, the magnetooptical Kerr effect and X-ray magnetic circular dichroism techniques are introduced as two of the main experimental techniques for exploring ultrafast spin dynamics.
Journal ArticleDOI
Nanoscale modules with full spin-wave interconnectivity
TL;DR: The significance of these designs is that the communication between the nodes can be done in constant time, which is a noteworthy improvement considering the Ω(log N) lower-bound on the time delay for implementing such networks in VLSI using traditional electrical interconnects.
Book ChapterDOI
Measurement of Dynamic Properties in Thin-Films
TL;DR: In this article, the authors consider the basic physics of magnetization switching and characterize the dynamic properties of a particular magnetization thin film, which can be classified into four classes: magnetic viscosity, thermal eflPects, domain wall motion, incoherent rotation, coherent rotation and nonlinear coherent motion.
A comprehensive simulation package for analysis of multilayer spintronic devices
TL;DR: The cmtj as discussed by the authors simulation package allows large-scale macrospin simulations for a variety of multilayer spintronics devices, such as spin diode ferromagnetic resonance, pulse-induced microwave magnetometry, or harmonic Hall voltage measurements.
References
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Journal ArticleDOI
A Mechanism of Magnetic Hysteresis in Heterogeneous Alloys
Edmund C. Stoner,E. P. Wohlfarth +1 more
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