Adaption of a diffractometer for time-resolved X-ray resonant magnetic scattering

Abstract

A new set-up is presented to measure element-selective magnetization dynamics using the ALICE chamber [Grabis et al. (2003), Rev. Sci. Instrum. 74, 4048-4051] at the BESSY II synchrotron at the Helmholtz-Zentrum Berlin. A magnetic-field pulse serves as excitation, and the magnetization precession is probed by element-selective X-ray resonant magnetic scattering. With the use of single-bunch-generated X-rays a temporal resolution well below 100 ps is reached. The ALICE diffractometer environment enables investigations of thin films, described here, multilayers and laterally structured samples in reflection or diffuse scattering geometry. The combination of the time-resolved set-up with a cryostat in the ALICE chamber will allow temperature-dependent studies of precessional magnetization dynamics and of damping constants to be conducted over a large temperature range and for a large variety of systems in reflection geometry.

Microwave soft x-ray microscopy for nanoscale magnetization dynamics in the 5–10 GHz frequency range

“…Such x-rays are in principle capable of looking at magnetism both at the nanoscale, given their short wavelength, and at fast time scales, since a typical synchrotron x-ray pulse has a duration of 50-100 ps. Some work has been done on measuring ferromagnetic resonance (FMR) in extended samples [1][2][3][4][5][6][7][8][9][10] , but measurements combining the time-resolved probing of fast magnetization dynamics with nanoscale x-ray microscopy are challenging and still very rare [11][12][13][14][15] . Such studies have also been restricted to dynamics at frequencies lower than 3 GHz.…”

Shining a Light on Hidden Spin Dynamics

“…A similar type of phase variation in different ferromagnetic layers has been observed previously in magnetic bilayers [2-4, 6, 7], and FMR coupled with XRMS has been implemented in geometries with in-plane magnetization [8][9][10]. The advance by Burn and co-workers has been to fully map out the relationship between precession phase and depth in the small-cone-angle regime, in which the precession cone angle varies linearly with H RF amplitude.…”

Toward broad-band x-ray detected ferromagnetic resonance in longitudinal geometry

“…But core-hole effects, in particular, in the soft x-ray regime may play a significant role. 7,13 Furthermore, different set-ups for microwave excitation like strip-line geometries, [10][11][12]14 or resonator-based schemes 5,8 have been used, which limits the accessible frequency range in a single experiment.…”