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Instruments / Technical Area	Publication Details	Published
I06-Nanoscience	Imaging of current induced Néel vector switching in antiferromagnetic Mn 2 Au S. Yu. Bodnar , M. Filianina , S. P. Bommanaboyena , T. Forrest , F. Maccherozzi , A. A. Sapozhnik , Y. Skourski , M. Klaui , M. Jourdan Physical Review B 99 DOI: 10.1103/PhysRevB.99.140409 Diamond Proposal Number(s): [20534] Show Abstract ▼ Abstract: The effects of current induced Néel spin-orbit torques on the antiferromagnetic domain structure of epitaxial Mn2Au thin films were investigated by x-ray magnetic linear dichroism–photoemission electron microscopy.We observed current induced switching of antiferromagnetic domains essentially corresponding to morphological features of the samples. Reversible as well as irreversible Néel vector reorientation was obtained in different parts of the samples and the switching of up to 30% of all domains in the field of view of 10 μm is demonstrated. Our direct microscopical observations are compared to and fully consistent with anisotropic magnetoresistance effects previously attributed to current induced Néel vector switching in Mn2Au.	Apr 2019
I06-Nanoscience	Direct imaging of antiferromagnetic domains in Mn 2 Au manipulated by high magnetic fields A. A. Sapozhnik , M. Filianina , S. Yu. Bodnar , A. Lamirand , M.-a. Mawass , Y. Skourski , H.-j. Elmers , H. Zabel , M. Klaui , M. Jourdan Physical Review B 97, 134429 DOI: 10.1103/PhysRevB.97.134429 Diamond Proposal Number(s): [17120] Show Abstract ▼ Abstract: In the field of antiferromagnetic (AFM) spintronics, information about the Néel vector, AFM domain sizes, and spin-flop fields is a prerequisite for device applications but is not available easily.We have investigated AFM domains and spin-flop-induced changes of domain patterns in Mn2Au(001) epitaxial thin films by x-ray magnetic linear dichroism photoemission electron microscopy (PEEM) using magnetic fields up to 70 T. As-prepared Mn2Au films exhibit AFM domains with an average size of 1μm. Application of a 30 T field, exceeding the spin-flop field, along a magnetocrystalline easy axis dramatically increases the AFM domain size with Néel vectors perpendicular to the applied field direction. The width of Néel-type domain walls (DW) is below the spatial resolution of the PEEM and therefore can only be estimated from an analysis of the DW profile to be smaller than 80 nm. Furthermore, using the values for the DW width and the spin-flop field, we evaluate an in-plane anisotropy constant ranging between 1 and 17 eV/f.u..	Apr 2018
NONE-No attached Diamond beamline	Role of B diffusion in the interfacial Dzyaloshinskii-Moriya interaction in Ta/Co20Fe60B20/MgO nanowires R. Lo Conte , E. Martinez , A. Hrabec , A. Lamperti , T. Schulz , L. Nasi , L. Lazzarini , R. Mantovan , F. Maccherozzi , S. Dhesi , B. Ocker , Christopher Marrows , Thomas Moore , Mathias Klaui Physical Review B 91 (1) DOI: 10.1103/PhysRevB.91.014433 Show Abstract ▼ Abstract: We report on current-induced domain wall motion in Ta/Co20Fe60B20/MgO nanowires. Domain walls are observed to move against the electron flow when no magnetic field is applied, while a field along the nanowires strongly affects the domain wall motion velocity. A symmetric effect is observed for up-down and down-up domain walls. This indicates the presence of right-handed domain walls, due to a Dzyaloshinskii-Moriya interaction (DMI) with a DMI coefficient D=+0.06mJ/m2. The positive DMI coefficient is interpreted to be a consequence of B diffusion into the Ta buffer layer during annealing, which was observed by chemical depth profiling measurements. The experimental results are compared to one-dimensional model simulations including the effects of pinning. This modeling allows us to reproduce the experimental outcomes and reliably extract a spin-Hall angle θSH=0.11 for Ta in the nanowires, showing the importance of an analysis that goes beyond the model for perfect nanowires.	Jan 2015
I06-Nanoscience	Scaling of spin relaxation and angular momentum dissipation in permalloy nanowires T. Moore , M. Klaui , L. Heyne , P. Mohrke , D. Backes , J. Rhensius , U. Rudiger , L. Heyderman , J.-u. Thiele , G. Wolterstorf , C. Back , A. Fraile Rodriquez , F. Nolting , T. Mentes , M. Nino , A. Locatelli , S. Dhesi , S. Cavill , H. Marchetto , A. Potenza Physical Review B 80 (13), 132403 DOI: 10.1103/PhysRevB.80.132403 Show Abstract ▼ Abstract: We study the relationship between the damping (alpha) and the nonadiabaticity of the spin transport (beta) in permalloy nanowires. alpha is engineered by Ho doping, and from the characteristics of the current-induced domain-wall velocity, determined by high-resolution x-ray magnetic circular-dichroism photoemission electron microscopy, beta due to spin relaxation is measured. We find that beta scales with alpha and conclude that the spin relaxation that leads to nonadiabatic spin torque originates from the same underlying mechanism as the angular momentum dissipation that causes viscous damping.	Oct 2009
I06-Nanoscience	Domain wall velocity measurement in permalloy nanowires with X-ray magnetic circular dichroism imaging and single shot Kerr microscopy T. A. Moore , M. Klaui , L. Heyne , P. Möhrke , D. Backes , J. Rhensius , U. Rüdiger , L. J. Heyderman , T. O. Mentes , M. A. Niño , A. Locatelli , A. Potenza , S. S. Dhesi , S. Cavill , H. Marchetto Journal Of Magnetism And Magnetic Materials DOI: 10.1016/j.jmmm.2009.06.048 Show Abstract ▼ Abstract: Domain walls (DWs) propagated along nanoscale magnetic wires by current or field pulses could potentially be used for data storage or logic applications, but the understanding of the DW dynamics, particularly under the influence of spin-polarized current, is incomplete. Measuring the velocity can give insights into the physics of the DW motion. Here we demonstrate DW velocity measurements in permalloy (Ni80Fe20Ni80Fe20) nanowires (1500 nm width and 20 nm thickness) using the techniques of X-ray magnetic circular dichroism photoemission electron microscopy (XMCD-PEEM) to image the magnetic contrast in the nanowires, and single shot Kerr microscopy, which allows for dynamic measurements. The magnetic imaging yields the average velocity as well as information on the DW spin structure, whereas the single shot method highlights the stochastic nature of the DW motion.	Jun 2009

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