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Search Publications by: Hans Nembach (Fed)

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Displaying 1 - 25 of 133

Uncovering the Timescales of Spin Reorientation in TbMn6Sn6

July 26, 2024
Author(s)
Sinead Ryan, Anya Grafov, Na Li, Hans Nembach, Justin Shaw, Hari Bhandari, Tika Kafle, Richa Sapkota, Henry Kapteyn, Nirmal Ghimire, Margaret Murnane
TbMn6Sn¬6 is a ferrimagnetic material which exhibits a highly unusual phase transition near room temperature where spins remain collinear while the total magnetic moment rotates from out-of-plane to in-plane. The mechanisms underlying this phenomenon have

Symmetry-dependent ultrafast manipulation of nanoscale magnetic domains

December 23, 2022
Author(s)
Nanna Hagstrom, Rahul Jangid, F. N. U. Meera, Diego Turenne, Jeffrey Brock, Erik Lamb, Boyan Stoychev, Justine Schlappa, Natalia Gerasimova, Benjamin Van Kuiken, Rafael Gort, Laurent Mercadier, Loic Le Guyader, Andrey Samartsev, Andreas Scherz, Giuseppe Mercurio, Hermann Durr, Alexander Reid, Monika Arora, Hans Nembach, Justin Shaw, Emmanuelle Jal, Eric Fullerton, Mark Keller, Roopali Kukreja, Stefano Bonetti, Thomas J. Silva, Ezio Iacocca
Symmetry is a powerful concept in physics, but its applicability to far-from-equilibrium states is still being understood. Recent attention has focused on how far-from-equilibrium states lead to spontaneous symmetry breaking. Conversely, ultrafast optical

Ultrafast perturbation of magnetic domains by optical pumping in a ferromagnetic multilayer

October 19, 2022
Author(s)
Dmitriy Zusin, Ezio E. Iacocca, Loic Le Guyader, Alexander H. Reid, William Schlotter, TianMin Liu, Daniel Higley, Giacomo Coslovich, Scott F. Wandel, Phoebe Tengdin, Sheena K. Patel, Anatoly Shabalin, Nelson Hua, Stjepan Hrkac, Hans Nembach, Justin Shaw, Sergio Montoya, Adam Blonsky, Christian Gentry, Mark Hoefer, Margaret M. Murnane, Henry C. Kapteyn, Eric E. Fullerton, Oleg Shpyrko, Hermann Durr, Thomas J. Silva
Ultrafast optical pumping of spatially nonuniform magnetic textures is known to induce far-from-equilibrium spin transport effects. Here, we use ultrafast x-ray diffraction with unprecedented dynamic range to study the laser-induced dynamics of labyrinth

Megahertz-rate Ultrafast X-ray Scattering and Holographic Imaging at the European XFEL

August 23, 2022
Author(s)
Thomas J. Silva, Hans Nembach, Mark Keller, Justin Shaw, Nanna Hagstrom, michael schneider, Nico Kerber, Alexander Yaroslavtsev, Erick Parra, Eric Fullerton, Oleg Shpyrko, Christian Gutt, Hermann Durr, Ezio Iacocca, Roopali Kukreja, stefano Bonetti, Emmanuelle Jal
The advent of X-ray free-electron lasers (XFELs) has revolutionized fundamental science, from atomic to condensed matter physics, from chemistry to biology, giving researchers access to X-rays with unprecedented brightness, coherence, and pulse duration

Imaging of Magnetic Excitations in Nanostructures with Microwave Near-Field Microscopy

November 25, 2021
Author(s)
Samuel Berweger, Robert Tyrrell-Ead, Houchen Chang, Mingzhong Wu, Hong Tang, Hans Nembach, Karl Stupic, Stephen E. Russek, Thomas Mitchell (Mitch) Wallis, Pavel Kabos
We present images of spin-wave excitations in a patterned yttrium iron garnet (YIG) thin film obtained by use of near-field microwave microscopy, which can achieve spatial resolution as high as 50 nm. Visualization of magnetic excitations is an enticing

Comparison of measured and simulated spin-wave mode spectra of magnetic nanostructures

January 6, 2021
Author(s)
Hans Nembach, Robert McMichael, Michael Schneider, Justin Shaw, Thomas J. Silva
Motivated by the importance of magnetization dynamics in nanomagnets for the development and optimization of magnetic devices and sensors, we measured and modeled spin wave spectra in patterned elliptical nanomagnets. Ferromagnetic resonance spectra for

Nonlinear losses in magnon transport due to four-magnon scattering

May 25, 2020
Author(s)
T. Hula, K. Schultheiss, A. Budzakov, L. Korber, M. Bejarano, L. Flacke, L. Liensberger, M. Weiler, Justin Shaw, Hans Nembach, J. Fassbender, H. Schultheiss
We report on the impact of nonlinear four-magnon scattering on magnon transport in microstructured Co 25Fe 75 waveguides with low magnetic damping. We determine the magnon propagation length with microfocused Brillouin light scattering over a broad range

Tuning interfacial Dzyaloshinskii-Moriya interactions in thin amorphous ferrimagnetic alloys

May 4, 2020
Author(s)
Yassine Quessab, Jun-Wen Xu, Chung Ting Ma, W. Zhou, Grant A. Riley, Justin Shaw, Hans Nembach, S. J. Poon, Andrew D. Kent
Skyrmions can be stabilized in magnetic systems with broken inversion symmetry and chiral interactions, such as Dzyaloshinskii-Moriya interactions (DMI). Further, compensation of magnetic moments in ferrimagnetic materials can significantly reduce magnetic

All-optical spin transfer between elemental sublattices in half-metallic Co2MnGe Heusler compound within the femtosecond laser excitation pulse

January 17, 2020
Author(s)
Phoebe Tengdin, Christian Gentry, Adam Blonsky, Dmitriy Zusin, Michael Gerrity, Lukas Hellbruck, Moritz Hofherr, Justin Shaw, Yaroslav Kvashnin, Erna K. Delczeg-Czirjak, Monika Arora, Hans Nembach, Thomas J. Silva, Stefan Mathias, Martin Aeschliman, Henry C. Kapteyn, Danny Thonig, Konstantinos Koumpouras, Olle Eriksson, Margaret M. Murnane
Heusler compounds are exciting materials for future spintronics applications because they display a wide range of tunable electronic and magnetic interactions. Here, we use a femtosecond laser to directly transfer spin polarization from one element to

Ultrafast optically induced spin transfer in ferromagnetic alloys

January 17, 2020
Author(s)
Moritz Hofherr, Soren Hauser, J. K. Dewhurst, Phoebe Tengdin, S Sakshath, Hans Nembach, Tobias Weber, Justin Shaw, Thomas J. Silva, H C. Kapteyn, M Cinchetti, B Rethfeld, M M. Murnane, D Steil, B Stadtmuller, S Sharma, Martin Aeschlimann, S Mathias
The vision of using light to manipulate electronic and spin excitations in materials on their fundamental time and length scales requires new approaches in experiment and theory to observe and understand these excitations. The ultimate speed limit for all

High spin-wave propagation length consistent with low damping in a metallic ferromagnet

August 31, 2019
Author(s)
L. Flacke, L. Liensberger, Matthias Althammer, Hans Huebl, Stephan Gepr?ags, Katrin Schultheiss, Aleksandr Buzdakov, T. Hula, H. Schultheiss, Eric R. Edwards, Hans Nembach, Justin Shaw, Rudolf Gross, M. Weiler
We report ultralow intrinsic magnetic damping in Co 25Fe 75 heterostructures, reaching the low 10 -4 regime at room temperature. By using a broadband ferromagnetic resonance technique in out-of-plane geometry, we extracted the dynamic magnetic properties