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Physics

Magnetics

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Displaying 101 - 125 of 291

Magnetoelasticity of Co 25 Fe 75 thin films

August 20, 2019
Author(s)
Daniel Schwienbacher, Matthias Pernpeintner, Lukas Liensberger, Eric R. Edwards, Hans Nembach, Justin Shaw, Mathias Weiler, Rudolf Gross, Hans Huebl
We investigate the magnetoelastic properties of Co 25Fe 75 and Co 10Fe 90 thin films by measuring the mechanical properties of a doubly clamped string resonator covered with multilayer stacks containing these films. For the magnetostrictive constants, we

Anomalous spin-orbit torques in magnetic single-layer films

July 22, 2019
Author(s)
Wenrui Wang, Tao Wang, Vivek P. Amin, Yang Wang, Anil Radhakrishna, Angie Davidson, Shane Allen, Thomas J. Silva, Hendrik Ohldag, Davor Balzar, Barry L. Zink, Paul M. Haney, John Xiao, D.G. Cahill, Virginia O. Lorenz, Xin Fan
Spin-orbit interaction (SOI) couples charge and spin transport, enabling electrical control of magnetization, the foundation of next-generation spintronic devices. A quint essential example of SOI-induced transport is the anomalous Hall effect (AHE), first

Developing Next-generation Brain Sensing Technologies - A Review

July 22, 2019
Author(s)
Jacob T. Robinson, Eric Pohlmeyer, Malte C. Gather, Caleb Kemere, John Kitching, George G. Malliaras, Adam Marblestone, Kenneth L. Shepard, Thomas Stieglitz, Chong Xie
Advances in sensing technology raise the possibility of creating neural interfaces that can more effectively restore or repair neural function and reveal fundamental properties of neural information processing. To realize the potential of these

Spin-current-mediated Rapid Magnon Localisation and Coalescence After Ultrafast Optical Pumping of Ferrimagnetic Alloys

April 15, 2019
Author(s)
Ezio E. Iacocca, TianMin Liu, Alexander H. Reid, Z Fu, S Ruta, P. W. Granitzka, E Jal, S. Bonetti, A. Gray, C E. Graves, R Kukreja, Z Chen, Daniel Higley, T Chase, L L. Guyader, K Hirsch, H Ohldag, W F. Schlotter, G L. Dakovski, Giacomo Coslovich, M C. Hoffmann, S Carron, A Tsukamoto, A Kirilyuk, A V. Kimel, Th Rasing, J Stohr, R F. Evans, T Ostler, R W. Chantrell, M A. Hoefer, Thomas J. Silva, H A. Durr
Sub-picosecond magnetisation manipulation via femtosecond optical pumping has attracted wide attention ever since its original discovery in 1996. However, the spatial evolution of the magnetisation is not yet well understood, in part due to the difficulty

Domain-wall motion and interfacial Dzyaloshinskii-Moriya interactions in Pt/Co/Ir(tIr)/Ta multilayers

March 7, 2019
Author(s)
Kowsar Shahbazi, Joo-Von Kim, Hans Nembach, Justin Shaw, Andreas Bischof, Marta Rossell, Vincent Jeudy, Thomas A. Moore, Christopher H. Marrows
The interfacial Dzyaloshinskii-Moriya interaction (DMI) is important for chiral domain walls (DWs) and for stabilizing magnetic skyrmions. We study the effects of introducing increasing thicknesses of Ir, from zero to 2 nm, into a Pt/Co/Ta multilayer

Axisymmetric scalable magneto-gravitational trap for diamagnetic particle levitation

December 11, 2018
Author(s)
Kristine A. Bertness, John P. Houlton, Max L. Chen, Matthew D. Brubaker, Charles T. Rogers
We report an axisymmetric magnetic trap design for levitating diamagnetic particles. The magnetic traps each consist of two iron pole pieces passively driven by a neodymium iron boron (NdFeB) permanent magnet. The magnetic field configuration between the

Energy efficient single flux quantum based neuromorphic computing

November 8, 2018
Author(s)
Michael Schneider, Christine A. Donnelly, Stephen E. Russek, Burm Baek, Matthew Pufall, Pete Hopkins, William Rippard
Many neuromorphic hardware technologies are being explored for their potential to increase the efficiency of computing certain problems, and thus facilitate machine learning with greater energy efficiency and or with more complexity. Among the technologies

Persistence of Electromagnetic Units in Magnetism

October 31, 2018
Author(s)
Ronald B. Goldfarb
The centimeter-gram-second system of electromagnetic units (EMU) has been used in magnetism since the late 19th century. The International System of Units (SI), a successor to Giorgi's 1901 meter- kilogram-second system, was adopted by the General

High-speed low-power neuromorphic systems based on magnetic Josephson junctions

October 25, 2018
Author(s)
Michael Schneider, Christine A. Donnelly, Stephen E. Russek
Josephson junctions and single flux quantum (SFQ) circuits form a natural neuromorphic technology with SFQ pulses and superconducting transmission lines simulating action potentials and axons, respectively. Josephson junctions consist of superconducting

Inhomogeneous magnon scattering during ultrafast demagnetization

October 25, 2018
Author(s)
Ronny J. Knut, Erna Delczeg-Czirjak, Somnath Jana, Justin M. Shaw, Hans T. Nembach, Yaroslav Kvashnin, Robert Stefaniuk, Rameez Malik, Patrik Grychtol, Dmitriy Zusin, Christian Gentry, Raghuveer Chimata, Manuel Pereiro, Johan Soderstrom, Emrah Turgut, Martina Ahlberg, Johan Akerman, H C. Kapteyn, Margaret M. Murnane, Dario A. Arena, Olle Eriksson, Olof Karis, Thomas J. Silva
Ni 0.8Fe 0.2 (Py) and Py alloyed with Cu exhibit intriguing ultrafast demagnetization behavior, where the Ni magnetic moment shows a delayed response relative to the Fe, an effect which is strongly enhanced by Cu alloying. We have studied a broad range of