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Physics

Magnetics

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Displaying 176 - 200 of 291

Non-collinear generation of angularly isolated circularly polarized high harmonics

September 21, 2015
Author(s)
Justin M. Shaw, Daniel Hickstein, Franklin Dollar, Patrik Grychtol, Jennifer Ellis, Carlos Hernandez-Garcia, Ronny J. Knut, Christian Gentry, Henry Kapteyn, Margaret Murnane
We generate ultrashort pulses of angularly isolated, circularly polarized extreme ultraviolet (EUV) light through the first implementation of noncollinear high harmonic generation with circularly polarized driving lasers. The noncollinear geometry offers

Ferromagnetic resonance measurement using stroboscopic magneto optical Kerr effect

June 7, 2015
Author(s)
Takahiro Moriyama, Seungha Yoon, Robert McMichael
We have developed a novel ferromagnetic resonance measurement technique using the magneto optical Kerr effect. The measurement technique uses microwave-frequency, intensity-modulated light to stroboscopically measure the Kerr angle due to the magnetization

Higher order perpendicular magnetic anisotropy in ultra-thin Co60Fe20B20 layers and the observation of an easy cone state.

June 1, 2015
Author(s)
Justin M. Shaw, Hans T. Nembach, Mathias A. Weiler, Martin A. Schoen, Thomas J. Silva, Jonathan Z. Sun, Daniel C. Worledge
We used broadband ferromagnetic resonance (FMR) spectroscopy to measure the second and forth order perpendicular magnetic anisotropies in Ta/ Co60Fe20B20/MgO layers over a thickness range of 0.8-5 nm. For a thickness greater than 1.0 nm, the easy axis is

Dynamics of Magnetic Nanoparticles and Nanodevices

May 31, 2015
Author(s)
Stephen E. Russek, Eric R. Evarts, Robert J. Usselman
Nanoscale magnetic devices and particles are being developed for a wide variety of applications including magnetic memory, nanoscale sensors, magnetic resonance imaging (MRI) agents, and therapeutic agents. Magnetic nanoparticles are also endogenous to the

On-wafer Magnetic Resonance of Magnetite Nanoparticles

May 11, 2015
Author(s)
Charles A. Little, Stephen E. Russek, James C. Booth, Pavel Kabos, Robert J. Usselman
Magnetic resonance measurements of ferumoxytol and TEMPO were made using an on-wafer transmission line technique with a vector network analyzer, allowing for broadband measurements of small sample volumes (4 nl) and a small numbers of spin (1 nmole). On

Nanoscale Spin Valve Josephson Junction Devices

April 14, 2015
Author(s)
Burm Baek, William H. Rippard, Matthew R. Pufall, Samuel P. Benz, Stephen E. Russek, Horst Rogalla, Paul D. Dresselhaus
Traditionally, superconductivity and magnetism have had a mutually exclusive relationship. However, the physics of superconductor-ferromagnet hybrid structures turned out to be far from being simply destructive, which has led to the hope of a new breed of

Nonlinear ferromagnetic resonance shift in submicron Permalloy ellipses

February 27, 2015
Author(s)
Feng Guo, Lyubov Belova, Robert D. McMichael
We report a systematic study of nonlinearity in the ferromagnetic resonance of a series of submicron Permalloy ellipses with varying aspect ratios. We focus on the sign of the foldover, a resonance field shift or frequency shift that occurs with high

Magnetic structure and anisotropy of [Co/Pd]_5/NiFe multilayers

January 9, 2015
Author(s)
Larysa Tryputen, Feng Guo, Liu Frank, T. N. Anh Nguyen, Majid Mohseni, Sunjae Chung, Yeyu Fang, Johan Akerman, Robert McMichael, Caroline Ross
The magnetization behavior, magnetic anisotropy and domain congurations of Co/Pd multilayers with perpendicular magnetic anisotropy capped with permalloy is investigated using magnetometry, magnetic force microscopy and ferromagnetic resonance. The

Spin-transfer torque switching observed in nanopillar superconducting-magnetic hybrid Josephson junctions

January 9, 2015
Author(s)
Burm Baek, William H. Rippard, Matthew R. Pufall, Samuel P. Benz, Stephen E. Russek, Horst Rogalla, Paul D. Dresselhaus
Combining superconducting and magnetic materials to create novel superconducting devices has been motivated by the discovery of the Josephson critical current (Ics) oscillations with magnetic layer thickness and the demonstration of devices with switchable

Phase-Sensitive Detection of Spin Pumping via the ac Inverse Spin Hall Effect

October 6, 2014
Author(s)
Thomas J. Silva, Justin M. Shaw, Hans T. Nembach, Mathias A. Weiler
Sources of pure spin currents are a fundamental building block of spintronic devices. In ferromagnet/normal metal heterostructures, spin currents are generated at ferromagnetic resonance. This is known as spin pumping, where spin currents of both dc and ac