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Physics

Magnetics

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Displaying 151 - 175 of 291

The Permeability of Vacuum and the Revised International System of Units

December 29, 2017
Author(s)
Ronald B. Goldfarb
The International System of Units (SI) is expected to be revised such that all seven base units, including the kilogram, will be defined in terms of fixed numerical values of seven defining constants. The revised SI will include a redefinition of the

Optical spin transfer and spin-orbit torques in thin-film ferromagnets

August 30, 2017
Author(s)
Junwen Li, Paul M. Haney
We study the optically induced torques on thin film ferromagnetic layers under excitation by circularly polarized light. We include Rashba spin-orbit coupling and assume an out-of-plane magnetization, and consider incident light with an in-plane component

Spin-wave propagation in cubic anisotropy materials

June 30, 2017
Author(s)
Koji Sekiguchi, Seo-Won Lee, Hiroaki Sukegawa, Nana Sato, Se-Hyeok Oh, Robert McMichael, Kyung-Jin Lee
The information carrier of modern technologies is the electron charge whose transport inevitably generates Joule heating. Spin-wave, the collective precessional motion of electron spins, does not involve moving charges and thus alleviates Joule heating [1

A Perspective on Nonvolatile Magnetic Memory Technology

December 21, 2016
Author(s)
Ronald B. Goldfarb
Magnetic random-access memory (MRAM) is characterized by nonvolatility, low energy dissipation, high endurance (repeated writing), scalability to smaller dimensions, compatibility with complementary metal-oxide semiconductor (CMOS) processing, resistance

Circular Photogalvanic Effect in Organometal Halide Perovskite CH3NH3PbI3

November 7, 2016
Author(s)
Junwen Li, Paul M. Haney
We study the circular photogalvanic effect in the organometal halide perovskite solar cell absorber CH$_3$NH$_3$PbI$_3$. The calculated photocurrent density is about $10^{-9}$ A/W, comparable to the previously studied quantum well and bulk Rashba systems

Spin wave localization in tangentially magnetized films

June 28, 2016
Author(s)
Elena V. Tartakovskaya, Martha Pardavi-Horvath, Robert McMichael
We present an analytical description of localized spin wave modes that form in a parabolic field minimum in a thin ferromagnetic film. Mode profiles proportional to Hermite functions are eigen-functions of the applied field and exchange parts of the

Phase-resolved ferromagnetic resonance using heterodyne detection method

April 28, 2016
Author(s)
Seungha Yoon, Hau Jian Liu, Robert D. McMichael
This paper describes a phase-resolved ferromagnetic resonance (FMR) measurement using a heterodyne method. Spin precession is driven by microwave fields and detected by 1550 nm laser light that is modulated at a frequency slightly shifted with respected to

Concentric transmon qubit featuring fast tunability and an anisotropic magnetic dipole moment

January 21, 2016
Author(s)
Jochen Braumuller, Martin O. Sandberg, Michael Vissers, Andre Schneider, Steffen Schlor, Lukas Grunhaupt, Hannes Rotzinger, Michael Marthaler, Alexander Lukashenko, Amadeus Dieter, Alexey V. Ustinov, Martin Weides, David P. Pappas
We present a planar qubit design based on a superconducting circuit that we call concentric transmon. While employing a straightforward fabrication process using Al evaporation and lift-off lithography, we observe qubit lifetimes and coherence times in the

Logic circuit prototypes for three-terminal magnetic tunnel junctions with mobile domain walls

January 12, 2016
Author(s)
Jean Anne Currivan-Incorvia, S. Siddiqui, S. Dutta, Eric R. Evarts, J. Zhang, D. Bono, C A. Ross, M. A. Baldo
Spintronic computing promises superior energy efficiency and nonvolatility compared to conventional field-effect transistor logic. But, it has proven difficult to realize spintronic circuits with a versatile, scalable device design that is adaptable to