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Search Publications

NIST Authors in Bold

Displaying 776 - 800 of 3361

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

Surface Magnetization of Ferromagnetic Ni(110): A Polarized LEED Experiment

September 3, 1979
Author(s)
Robert Celotta, Daniel T. Pierce, G Wang, S Bader, G P. Felcher
… (hysteresis curve) and the temperature dependence of the magnetization at a Ni(110) surface was measured by polarized … a few percent. The temperature dependence of the surface magnetization measured in the range 0.5 … Surface Magnetization of Ferromagnetic Ni(110): A Polarized LEED …

Neutron Scattering Studies of LiCoPO 4 & LiMnPO 4

June 9, 2009
Author(s)
W. Tian, Jiying Li, Haifeng Li, Jeffrey W. Lynn, J. L. Zarestky, David Vaknin
LiCoPO 4 (T N approximately equal) 21.8 K ) & LiMnPO 4 (T N approximately equal} 34 K) are antiferromagnetic insulators exhibiting large magnetoelectric effects. We performed inelastic neutron scattering (INS) experiments to investigate the spin dynamics

Controlling Magnetic Configuration in Soft-Hard Bilayers Probed by Polarized Neutron Reflectometry

January 13, 2022
Author(s)
Nan Tang, Jung-Wei Liao, Kai Liu, Siu-Tat Chui, Timothy Ziman, Alexander Grutter
… Hard/soft magnetic bilayer thin films have been widely used in data … technologies and permanent magnet applications. The magnetic configuration and response to temperatures and magnetic fields in these composite systems are considered to … Controlling Magnetic Configuration in Soft-Hard Bilayers Probed by …

Spin Jam Induced by Quantum Fluctuations in a Frustrated Magnet

September 15, 2015
Author(s)
Junjie Yang, Anjana Samarakoon, Sachith Dissanayake, Hiroaki Ueda, Israel Klich, Daniel M Pajerowski, Nicholas Butch, Qingzhen Huang, John R. Copley, Seung-Hun Lee
… jam, in the vicinity of the clean limit of a frustrated magnet, which is insensitive to a low concentration of … Spin Jam Induced by Quantum Fluctuations in a Frustrated Magnet …

Tailored Nanoscale Contrast Agents for Magnetic Resonance Imaging

December 30, 2005
Author(s)
Alexander J. Barker, Brant Cage, Stephen E. Russek, Ruchira Garg, R Shandas, Conrad Stoldt
… vectors are investigated for material properties and magnetic resonance imaging (MRI) contrast improvement. … particle size, monodispersity, crystal symmetry, and magnetic properties of the ensembles as a function of time. … route at 3 hours produced nanoparticles with the greatest magnetic anisotropy (15.8 x 10 4 J/m 3 ). The feasibility of …

Progress Towards Standards for Quantitative MRI (qMRI) and Outstanding Needs

January 24, 2019
Author(s)
Kathryn E. Keenan, Joshua R. Biller, Michael A. Boss, Adele P. Peskin, Karl F. Stupic, Stephen E. Russek, Jana Delfino, Mark Does, Jeffrey L. Evelhoch, Mark Griswold, Jeffrey Gunter, R Scott Hinks, Stuart Hoffman, Geena Kim, Riccardo Lattanzi, Xiaojuan Li, Luca Marinelli, Pratik Mukherjee, Robert J. Nordstrom, Elena Perez, Berkman Sahiner, Natalie J. Serkova, Amita Shukla-Dave, Michael Steckner, Lisa J. Wilmes, Holden Wu, Huiming Zhang, Edward F. Jackson, Daniel Sullivan
The National Institute of Standards and Technology (NIST) MRI Standards project held a one-day workshop on August 4, 2017 on campus in Boulder, CO. The goal of the workshop was to evaluate the advances in quantitative MRI (qMRI) since the last NIST

Investigation of Weak Interlayer Exchange Coupling in the GaMnAs/GaAs Superlattice with Insulating Nonmagnetic Spacers

July 1, 2011
Author(s)
Jae-Ho Chung, Young-Sang Song, Taehee Yoo, Sun-Jae Chung, Sanghoon Lee, Brian Kirby, X. Liu, J. K. Furdyna
A robust long-range antiferromagnetic coupling between ferromagnetic Ga 0.97Mn 0.03As layers has previously been realized via insertion of non-magnetic Be-doped GaAs spacers. In this paper, we report the observation of the weak antiferromagnetic coupling

Nanoscale spin wave localization using ferromagnetic resonance force microscopy

February 24, 2012
Author(s)
Han-Jong H. Chia, Feng Guo, Lyubov Belova, Robert D. McMichael
We utilize ferromagnetic resonance force microscopy (FMRFM) to generate and detect multiple localized spin wave modes with spatial dimensions less than 100 nm in ferromagnetic thin films. Localized spin waves are a potentially powerful tool for imaging

Damping phenomena in Co 90 Fe 10 /Ni multilayers and alloys

July 6, 2011
Author(s)
Justin M. Shaw, Hans T. Nembach, Thomas J. Silva
We used perpendicular ferromagnetic resonance to measure the damping parameter in Co 90Fe 10/Ni multilayers over a wide range of layer thicknesses. The magnetic anisotropy within this range varied from in-pane to out-of-plane. We measured (Co 90Fe 10) xNi

Microfabricated High-Moment Micrometer-Sized MRI Contrast Agents

August 26, 2010
Author(s)
Gary Zabow, John M. Moreland, Stephen Dodd, alan koretsky, erik shapiro
While chemically synthesized superparamagnetic microparticles have enabled much new research based on MRI tracking of magnetically labeled cells, signal-to-noise levels still limit the potential range of applications. Here it is shown how, through top-down

Spin Torque for Dummies

January 6, 2007
Author(s)
Thomas J. Silva
I will present a stripped down presentation on the fundamental mechanisms that give rise to spin torque effects. This presentation will assume the audience has little or no background in this fascinating and rapidly expanding field. We will start with an

A Distinct Spin Structure and Giant Baromagnetic Effect in MnNiGe Compounds with Fe-Doping

May 3, 2021
Author(s)
Feiran Shen, Houbo Zhou, Fengxia Hu, Jian-Tao Wang, Hui Wu, Qingzhen Huang, Jiazheng Hao, Zibing Yu, Yihong Gao, Yuan Lin, Yangxin Wang, Cheng Zhang, Zhuo Yin, Jing Wang, Sihao Deng, Jie Chen, Lunhua He, Tianjiao Liang, Jirong Sun, Tongyun Zhao, Baogen Shen
Spin structure of a magnetic system results from the competition of various exchange couplings. Pressure driven spin structure evolution, through altering interatomic distance and hence electronic structure, produces baromagnetic effect(BME), which has

Resonant interaction of trapped cold atoms with a magnetic cantilever tip

June 26, 2015
Author(s)
John E. Kitching, Chris Montoya, Jose Valencia, Andrew A. Geraci, Matt Eardley, John M. Moreland
… Magnetic resonance in an ensemble of laser-cooled trapped Rb atoms is excited using a micro cantilever with a magnetic tip. The cantilever is mounted on a multi-layer atom … The coupling is observed by measuring the loss from a magnetic trap as the oscillating cantilever induces Zeeman …

MgO Tunnel Barriers in Magnetic Nanostructures and Devices

April 28, 2010
Author(s)
Ranko R. Heindl, Matthew Pufall, William Rippard
… in the development of MgO based tunnel barriers for use in magnetic devices, such as nanoscale magnetic random access memory elements (MRAM) and magnetic field sensors. Much of the focus has been on … MgO Tunnel Barriers in Magnetic Nanostructures and Devices …

Spin-Transfer Nano-Oscillators

January 7, 2013
Author(s)
Stephen E. Russek, Ranko R. Heindl, Thomas Cecil, William H. Rippard
Spin transfer nano-oscillators are small multilayer magnetic devices that undergo microwave oscillations and output a microwave voltage when a bias current is applied. The oscillation frequency is tunable, over a range of 0.5 GHz to 225 GHz, by varying the

Interfacial Exchange Coupling in Fe/(Ga,Mn)As Bilayers

June 16, 2014
Author(s)
A. M. Alsmadi, Y. Choi, D.J. Keavney, K.F. Eid, Brian Kirby, X. Liu, J. Leiner, K. Tivakornsasithorn, M. Dobrowolska, J. K. Furdyna
We have carried out a systematical study of magnetic order and magnetic interlayer coupling in Fe/(Ga,Mn)As bilayers using superconducting quantum interference device magnetometry, polarized neutron reflectometry, element-specific x-ray absorption

Spin Rotation Induced by Applied Pressure in Cd-Doped Ce 2 RhIn 8 Intermetallic Compound

October 21, 2019
Author(s)
D. S. Christovam, C. Giles, L. Mendonca-Ferreira, Juscelino Leao, William D. Ratcliff, Jeffrey W. Lynn, S. Ramos, E. N. Hering, H. Hidaka, E. Baggio-Saitovich, Z. Fisk, P. G. Pagliuso, C. Adriano
The pressure evolution of the magnetic properties of the Ce 2RhIn 7.79Cd 0.21 heavy fermion compound was investigated by single crystal neutron magnetic diffraction and electrical resistivity experiments under applied pressure. From the neutron magnetic

Evaluation of Raman-scattering in La 1-x M x MnO 3 single-crystals due to structural and magnetic transitions, ed. by M. Hundley

January 1, 1998
Author(s)
Vyacheslav B. Podobedov, Alfons Weber, D B. Romero, Joseph P. Rice, H D. Drew
… features and these are strongly affected by structural and magnetic phase transitions. Due to the symmetry conditions in … Science and Technology of Magnetic Oxides Materials Research Society Symp Proc … in La 1-x M x MnO 3 single-crystals due to structural and magnetic transitions, ed. by M. Hundley …

Nano-Sized Ferrite Particles for Magnetic Resonance Imaging Thermometry

September 8, 2018
Author(s)
Janusz H. Hankiewicz, J A. Stoll, John Stroud, J Davidson, K L. Livesey, K Tvrdy, Alexana Roshko, Stephen E. Russek, Karl Stupic, P Bilski, Robert E. Camley
… Recently, we reported the use of magnetic particles as temperature indicators in magnetic resonance imaging thermometry (tMRI). In this … changes with temperature due to a temperature-dependent magnetic field inhomogeneity caused by the dipolar field of … Nano-Sized Ferrite Particles for Magnetic Resonance Imaging Thermometry …

In-plane bias in a patterned ferromagnetic/antiferromagnetic bilayer

April 30, 2009
Author(s)
Yury P. Kabanov, Valerian I. Nikitenko, Oleg A. Tikhomirov, William F. Egelhoff Jr., Alexander J. Shapiro, Robert D. Shull
Exchange bias in bi- and multilayer magnetic systems is usually ascribed to the existence of transient magnetic structures at the interfaces between adjacent layers. Here, we report the observation of a similar phenomenon in the lateral direction

Magnetoelastic effects in doubly clamped electroplated CoFe micro-beam resonators

March 12, 2019
Author(s)
Margo Staruch, S. P. Bennett, B. R. Matis, J. W. Baldwin, K. Bussmann, Daniel Gopman, Yury Kabanov, June W. Lau, Robert D. Shull, E. Langlois, C. Arrington, J. R. Pillars, Peter Finkel
Magnetostrictive Co77Fe23 films were fabricated on silicon wafers and fully suspended to produce free-standing, doubly clamped, micro-beam resonators. A negative or positive shift in the resonant frequency was observed for magnetic fields applied parallel
Displaying 776 - 800 of 3361
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