Precessional dynamics of elemental moments in a ferromagnetic alloy
W.E. Bailey, L. Cheng, D. Keavney, C.-C. Kao, E. Vescovo, D. Arena
TL;DR
This study uses element-specific pump-probe XMCD to measure and analyze the precessional dynamics of Ni and Fe magnetic moments in a ferromagnetic alloy, revealing their coupled in-phase precession at GHz frequencies.
Contribution
It introduces a method for element-specific measurement of magnetization precession in alloys, demonstrating coupled precession of Ni and Fe moments with high temporal and angular resolution.
Findings
Ni and Fe moments precess together at all frequencies
Precession occurs up to 2.6 GHz with < 2° rotational resolution
Ni and Fe moments are coupled in phase within 90 ps
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.
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