Precessional dynamics of elemental moments in a ferromagnetic alloy

Abstract

We demonstrate an element-specific measurement of magnetization precession in a metallic ferromagnetic alloy, separating Ni and Fe moment motion in Ni81Fe19. Pump-probe X-ray magnetic circular dichroism (XMCD), synchronized with short magnetic field pulses, is used to measure free magnetization oscillations up to 2.6 GHz with elemental specificity and a rotational resolution of < 2 deg. Magnetic moments residing on Ni sites and Fe sites in a Ni81Fe19(50nm) thin film are found to precess together at all frequencies, coupled in phase within instrumental resolution of 90 ps.

arXiv commentsee http://magnet.ap.columbia.edu/pubs for related work

Cited by in corpus (12)

• Identification of the dominant precession damping mechanism in Fe, Co, and Ni by first-principles calculations
• Direct detection of pure spin-current by x-ray pump-probe measurements
• Weakly Coupled Motion of Individual Layers in Ferromagnetic Resonance
• A compact apparatus for studies of element and phase-resolved ferromagnetic resonance
• Element-resolved x-ray ferrimagnetic and ferromagnetic resonance spectroscopy
• Non-Reciprocal Spin Pumping in Asymmetric Magnetic Trilayers
• X-ray imaging of spin currents and magnetisation dynamics at the nanoscale
• Experimental confirmation of the delayed Ni demagnetization in FeNi alloy
• Influence of topography and Co domain walls on the magnetization reversal of the FeNi layer in FeNi/Al$\_2$O$\_3$/Co magnetic tunnel junctions
• X-ray detected ferromagnetic resonance techniques for the study of magnetization dynamics
• Phase-resolved imaging of edge-mode spin waves using scanning transmission x-ray microscopy
• Element-specific visualization of dynamic magnetic coupling in a Co/Py bilayer microstructure