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Instruments / Technical Area	Publication Details	Published
	Lorentz near-field electron ptychography Shengbo You , Peng-Han Lu , Thomas Schachinger , András Kovács , Rafal E. Dunin-Borkowski , Andrew M. Maiden Applied Physics Letters 123 DOI: 10.1063/5.0169788 Open Access Show Abstract ▼ Abstract: Over the past few years, electron ptychography has drawn considerable attention for its ability to recover high contrast and ultra-high resolution images without the need for high quality electron optics. In this Letter, we focus on electron ptychography's other potential benefits: quantitatively mapping phase variations resulting from magnetic and electric fields over extended fields of view. To this end, we propose an implementation of near-field ptychography that employs an amplitude mask located in the electron microscope's condenser aperture plane. We demonstrate the capabilities of our method by imaging a magnetic Permalloy sample and compare our results with those of off-axis electron holography.	Nov 2023
I06-Nanoscience (XPEEM)	Writing information by current pulses in antiferromagnetic Mn2Au M. Jourdan , S. Reimers , Y. Lytvynenko , Y. R. Niu , E. Golias , B. Sarpi , L. S. I. Veiga , T. Denneulin , A. Kovács , R. E. Dunin-Borkowski , J. Bläßer , M. Klaui 2023 IEEE International Magnetic Conference DOI: 10.1109/INTERMAGShortPapers58606.2023.10228350 Diamond Proposal Number(s): [30141] Show Abstract ▼ Abstract: Antiferromagnets (AFMs) are promising for future spintronic applications because of their fast dynamics and lack of stray fields. For the required switching of the Néel vector (staggered magnetization), a current induced bulk Néel spin-orbit torque (NSOT) is most promising. Here we demonstrate current pulse induced complete, remanent, and reversible Néel vector switching of epitaxial Mn2Au(001) thin films. A current polarity dependence demonstrates an NSOT acting on AFM domain walls. We correlate direct imaging of the Néel vector reorientation by x-ray photoemission electron microscopy with measurements of the associated anisotropic magnetoresistance [1].	Sep 2023
I06-Nanoscience (XPEEM)	Current-driven writing process in antiferromagnetic Mn2Au for memory applications S. Reimers , Y. Lytvynenko , Y. R. Niu , E. Golias , B. Sarpi , L. S. I. Veiga , T. Denneulin , A. Kovács , R. E. Dunin-Borkowski , J. Bläßer , M. Klaui , M. Jourdan Nature Communications 14 DOI: 10.1038/s41467-023-37569-8 Diamond Proposal Number(s): [30141] Open Access Show Abstract ▼ Abstract: Current pulse driven Néel vector rotation in metallic antiferromagnets is one of the most promising concepts in antiferromagnetic spintronics. We show microscopically that the Néel vector of epitaxial thin films of the prototypical compound Mn2Au can be reoriented reversibly in the complete area of cross shaped device structures using single current pulses. The resulting domain pattern with aligned staggered magnetization is long term stable enabling memory applications. We achieve this switching with low heating of ≈20 K, which is promising regarding fast and efficient devices without the need for thermal activation. Current polarity dependent reversible domain wall motion demonstrates a Néel spin-orbit torque acting on the domain walls.	Apr 2023
I20-EDE-Energy Dispersive EXAFS (EDE)	Dynamics of palladium single-atoms on graphitic carbon nitride during ethylene hydrogenation Maurice Vennewald , Nina Michelle Sackers , Andree Iemhoff , Isabella Kappel , Claudia Weidenthaler , Ansgar Meise , Marc Heggen , Rafal E. Dunin-Borkowski , Luke Keenan , Regina Palkovits Journal Of Catalysis 118 DOI: 10.1016/j.jcat.2023.03.011 Diamond Proposal Number(s): [29667] Show Abstract ▼ Abstract: Single-atoms on carbon-nitrogen supports are considered catalysts for a multitude of reactions. However, doubts remain whether really these species or subnanometer clusters formed under reaction conditions are the active species. In this work, we investigate the dynamics of palladium single-atoms on graphitic carbon nitride during ethylene hydrogenation and H2-D2 exchange. By employing aberration-corrected scanning transmission electron microscopy, x-ray photoelectron spectroscopy and x-ray absorption spectroscopy, we will show that palladium, originally present as single-atoms, agglomerates to clusters at 100 °C in a gas atmosphere that contains both ethylene and hydrogen. This agglomeration goes in hand with the emergence of catalytic activity in both ethylene hydrogenation and H2-D2 exchange, suggesting that clusters, rather than single-atoms, are the active species. The results presented herein highlight the potential of analytics over the course of reaction to identify the active species and provide new insights into the influence of gas atmosphere on metal speciation.	Mar 2023

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