Precessional dynamics of elemental moments in a ferromagnetic alloy

Details Precessional dynamics of elemental moments in a ferromagnetic alloy Precessional dynamics of elemental moments in a ferromagnetic alloy

2004-05-13

arxiv.org/abs/cond-mat/0405295v1

Phys. Rev. B 70 172403 (2004)

Physics

Condensed Matter

Materials Science

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

Scientific paper

10.1103/PhysRevB.70.172403

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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