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Phys. Rev. B 70, 172403 (2004) [4 pages]

Precessional dynamics of elemental moments in a ferromagnetic alloy

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W. E. Bailey and L. Cheng
Materials Science Program, Department of Applied Physics, Columbia University, New York, New York 10027, USA*

D. J. Keavney
Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA

C.-C. Kao, E. Vescovo, and D. A. Arena
National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973, USA

Received 17 June 2004; published 5 November 2004

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, 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°. Magnetic moments residing on Ni sites and Fe sites in a Ni81Fe19(50 nm) thin film are found to precess together at all frequencies, coupled in phase within instrumental resolution of 90 ps.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.70.172403
DOI:
10.1103/PhysRevB.70.172403
PACS:
75.25.+z, 76.50.+g, 78.20.Ls, 78.47.+p

*URL: http://magnet.ap.columbia.edu

 
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