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Inductive measurement of ultrafast magnetization dynamics in thin-film Permalloy
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…
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Ferromagnetic resonance linewidth in metallic thin films: Comparison of measurement methods
Stripline (SL), vector network analyzer (VNA), and pulsed inductive microwave magnetometer (PIMM) techniques were used to measure the ferromagnetic resonance (FMR) linewidth for a series of Permalloy…
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Frequency modulation of spin-transfer oscillators
Spin-polarized dc electric current flowing into a magnetic layer can induce precession of the magnetization at a frequency that depends on current. We show that addition of an ac current to this dc…
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Direct-current induced dynamics in Co90 Fe10/Ni80 Fe20 point contacts.
TLDR
This work directly measured coherent high-frequency magnetization dynamics in ferromagnetic films induced by a spin-polarized dc current, resulting in a microwave oscillator that can be tuned from below 5 to above 40 GHz.
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Linear relation between Heisenberg exchange and interfacial Dzyaloshinskii–Moriya interaction in metal films
The Dzyaloshinskii–Moriya exchange induces a range of chiral phenomena in spintronic systems. Experiments now confirm that this interaction is proportional to the Heisenberg exchange, reflecting…
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Current-driven microwave dynamics in magnetic point contacts as a function of applied field angle
We have measured microwave frequency, current-driven magnetization dynamics in point contacts made to spin valves as a function of applied field strength and angle relative to the film plane. As the…
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Mutual phase-locking of microwave spin torque nano-oscillators
TLDR
It is shown that two STNOs in close proximity mutually phase-lock—that is, they synchronize, which is a general tendency of interacting nonlinear oscillator systems.
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Ultra-low magnetic damping of a metallic ferromagnet
Materials with low magnetic damping are important for a range of applications but are typically insulating, which limits their use. Thanks to a unique feature of the band structure, similar levels of…
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Ultrafast magnetization enhancement in metallic multilayers driven by superdiffusive spin current.
TLDR
Spatially separate the spin dynamics using Ni/Ru/Fe magnetic trilayers and surprisingly find that optically induced demagnetization of the Ni layer transiently enhances the magnetizations of the Fe layer when the two layer magnetizations are initially aligned parallel.
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Probing the timescale of the exchange interaction in a ferromagnetic alloy
TLDR
This work uses extreme ultraviolet pulses from high-harmonic generation as an element-specific probe of ultrafast, optically driven, demagnetization in a ferromagnetic Fe-Ni alloy (permalloy), and shows that for times shorter than the characteristic timescale for exchange coupling, the magnetization of Fe quenches more strongly than that of Ni.
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