Laser induced ultrafast Gd 4f spin dynamics at the surface of amorphous CoxGd100-x ferrimagnetic alloys
arxiv(2024)
摘要
We have investigated the laser induced ultrafast dynamics of Gd 4f spins at
the surface of CoxGd100-x alloys by means of surface-sensitive and
time-resolved dichroic resonant Auger spectroscopy. We have observed that the
laser induced quenching of Gd 4f magnetic order at the surface of the
CoxGd100-x alloys occur on a much longer time scale than that previously
reported in bulk sensitive time-resolved experiments. In parallel, we have
characterized the static structural and magnetic properties at the surface and
in the bulk of these alloys by combining Physical Property Measurement System
(PPMS) magnetometry with X-ray Magnetic Circular Dichroism in absorption
spectroscopy (XMCD) and X-Ray Photoelectron spectroscopy (XPS). The PPMS and
XMCD measurements give information regarding the composition in the bulk of the
alloys. The XPS measurements show non-homogeneous composition at the surface of
the alloys with a strongly increased Gd content within the first layers
compared to the nominal bulk values. Such larger Gd concentration results in a
reduced indirect Gd 4f spin-lattice coupling. It explains the slower Gd 4f
demagnetization we have observed in our surface-sensitive and time-resolved
measurements compared to that previously reported by bulk-sensitive
measurements.
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