REXS 2025 Almadraba

Session

Talks Wed Afternoon

T06

8 Oct 2025, 14:15

Hotel Almadraba Park (Roses, Girona, Spain)

88. Ultrafast Control of Electron-Phonon Coupling in LNSCO and LESCO (Chair: Hermann Durr)

Martin Bluschke (Quantum Matter Institute - University of British Columbia, Vancouver, Canada)

08/10/2025, 14:15

Oral

The emergence of $d$-wave superconductivity from the Mott insulating state in the cuprates is widely understood to result from the action of strong electron-electron interactions. Nevertheless, the parallel role of the electron-phonon interaction in defining the cuprate phase-diagram is highlighted by the ubiquitous presence of charge-density-wave correlations in these materials. Although...

82. Twists and Turns: Exploiting Azimuthal Dependences in the Ultrafast Time Domain (Chair: Hermann Durr)

William Windsor (TU Berlin & Fritz Haber Institute)

08/10/2025, 14:35

Oral

Ultrafast spin manipulation carries great potential for future information technology. Ferromagnets, which are commonly studied in this context, are limited by the dissipation of angular momentum. This is not the case for antiferromagnets, which offer both the prospect of faster and more efficient spin dynamics, as well as the possibility to exploit magnetic properties that are unavailable in...

85. Ultrafast dynamics of magnetic anisotropy and magnetic structure in ferrimagnetic CoTb thin films (Chair: Hermann Durr)

Moundji Hemili (Sorbonne Université, CNRS, Laboratoire Chimie Physique - Matière et Rayonnement, LCPMR, 75005, Paris, France)

08/10/2025, 15:00

Oral

Since the discovery of ultrafast demagnetization occurring on sub-picosecond timescales [1], numerous intriguing phenomena have been observed, especially in ferrimagnetic rare-earth (RE)–transition metal (TM) alloys [2]. In these materials, the two sub- systems exhibit distinct ultrafast magnetization dynamics when subjected to a femtosecond infrared pulse. For exemple, this has also been...

89. Magnetic Field Dependent Ultrafast Control of an Antiferromagnet (Chair: Hermann Durr)

Abeer Arora (Fritz Haber Institut Berlin, Germany)

08/10/2025, 15:25

Oral

Antiferromagnetic (AF) spintronics is a promising route towards more efficient and stable devices, because antiferromagnets are less susceptible to external fields and foster a broad range of magnetic interactions with the potential for higher speeds and energy efficient manipulation. However, their self-cancelling magnetic moment makes the interaction with magnetic order challenging. One way...

60. Variable out-of-plane magnetic field for soft x-ray resonant magnetic reflectivity (Chair: Maurizio Sacchi)

Jean-Marc Tonnerre (CNRS, Institut Néel)

08/10/2025, 16:05

Oral

It has been known that soft x-ray magnetic reflectivity is a technique for studying the magnetization profile, and therefore interfacial effects, in thin films with perpendicular magnetic anisotropy [1]. This specificity is related to the photon wavelength in the energy range, which allows measuring the reflectivity at very large angles and therefore being sensitive to the out-of-plane...

84. Helimagnetic Order in MnGe Thin Films Probed by RXMR (Chair: Maurizio Sacchi)

Theodore Monchesky (Dalhousie University)

08/10/2025, 16:30

Oral

MnGe is a cubic helimagnet belonging to the B20 family of compounds known to host skyrmion phases. MnGe exhibits the shortest helical wavelength among these compounds that varies between 3 nm at low temperature, up to 6 nm at the ordering temperature near 200 K. While skyrmions have not been observed in this material, there are reports of a unique topological magnetic phase consisting of...

50. Current-driven Magnetisation Reversal in CoFeTaB/Pt Probed By X-ray Magnetic Reflectivity (Chair: Maurizio Sacchi)

Kiranjot Dhaliwal (Diamond Light Source)

08/10/2025, 16:55

Oral

ABSTRACT
Electrical control of magnetisation offers a promising alternative to conventional external magnetic fields for manipulating magnetic materials. This work investigates the current driven magnetisation reversal in CoFeTaB/Pt taking advantage of the magnetisation direction and the polarisation dependence of the X-ray scattering cross-section [1]. A current is applied perpendicular to...

70. Spiral Spin Structure in Dy-Doped Spinel-Ferrite (Chair: Maurizio Sacchi)

Anupam Kumar Singh (Johannes Kepler University Linz)

08/10/2025, 17:20

Oral

Noncollinear spin structures have received tremendous interest in recent years as they
provide a versatile platform for spin control and manipulation desirable for spintronics1.
Realization of noncollinearity in ferrimagnetic insulators is of particular interest as the
combined effect of both ferro- and antiferromagnetic orders opens up opportunities for their potential utilization in...