Combined Time-Resolved X-ray Magnetic Circular Dichroism and Ferromagnetic Resonance Studies of Magnetic Alloys and Multilayers (invited)
We present measurements of element- and time-resolved ferromagnetic resonance (FMR) in magnetic thin films at gigahertz frequencies via an implementation of time-resolved x-ray magnetic circular dichroism (TR-XMCD). By combining TR-XMCD and FMR, using a rf excitation that is phase locked to the photon bunch clock, the dynamic response of individual layers or precession of individual elements in an alloy can be measured. The technique also provides extremely accurate measurements of the precession cone angle (to 0.1{sup o}) and the phase of oscillation (to 2{sup o}, or {approx}5 ps at 2.3 GHz). TR-XMCD combined with FMR can be used to study the origins of precessional damping by measuring the relative phase of dissimilar precessing magnetic moments. We have used the technique to measure the response of specific elements and separate layers in several alloys and structures, including a single Ni{sub 81}Fe{sub 19} layer, a pseudo-spin-valve structure (Ni{sub 81}Fe{sub 19}/Cu/Co{sub 93}Zr{sub 7}), magnetic bilayers consisting of low damping (Co{sub 93}Zr{sub 7}) and high damping (Tb-doped Ni{sub 81}Fe{sub 19}) layers joined across a common interface, and elemental moments in Tb-doped Ni{sub 81}Fe{sub 19}.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source
- Sponsoring Organization:
- Doe - Office Of Science
- DOE Contract Number:
- DE-AC02-98CH10886
- OSTI ID:
- 930501
- Report Number(s):
- BNL-80456-2008-JA; JAPIAU; TRN: US0901403
- Journal Information:
- Journal of Applied Physics, Vol. 101, Issue 9; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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