Current browse context:
cond-mat.mtrl-sci
Change to browse by:
References & Citations
Condensed Matter > Materials Science
Title: Laser induced ultrafast Gd 4f spin dynamics at the surface of amorphous CoxGd100-x ferrimagnetic alloys
(Submitted on 10 Jan 2024 (v1), last revised 25 Mar 2024 (this version, v3))
Abstract: 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.
Submission history
From: Nicolas Bergeard [view email][v1] Wed, 10 Jan 2024 12:53:48 GMT (1299kb)
[v2] Mon, 5 Feb 2024 11:23:45 GMT (1307kb)
[v3] Mon, 25 Mar 2024 13:05:57 GMT (1327kb)
Link back to: arXiv, form interface, contact.