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Displaying 1751 - 1775 of 3361

Chemical Pressure Effects on Pyrochlore Spin Ice

May 18, 2012
Author(s)
H. D. Zhou, J. G. Cheng, A. M. Hallas, C. R. Wiebe, G. Li, L. Balicas, J. S. Zhou, J. B. Goodenough, Jason S. Gardner, E. S. Choi
Ho 2Ge 2O 7 with the cubic pyrochlore structure was prepared by a high temperature high pressure technique. Detailed DC susceptibility, AC susceptibilty, and specific heat measurements confirm that it is a new spin ice. A comparison amoung the two sets of

Evolution from topological Dirac metal to flat-band-induced antiferromagnet in layered KxNi4S2 (0 ? x ? 1)

January 1, 2026
Author(s)
Hengdi Zhao, Xiuquan Zhou, Hyowon Park, Tianqi Deng, Brandon Wilfong, II Au, Samuel E. Pate, Craig Brown, Hui Wu, Tushar Bhowmick, Tessa McNamee, Ravhi Kumar, Yu-Sheng Chen, Zhi-Li Xiao, Russell Hemley, Weizhao Cai, Shanti Deemyad, Duck-Young Chung, Stephan Rosenkranz, Mercouri G. Kanatzidis
Dirac materials and flat-band systems, each possessing distinct electronic structures, have captivated a wide range of scientific communities for their potential to host diverse emerging phenomena. In particular, a tunable ground state featuring a Fermi

Topological lattice using multi-frequency radiation

March 19, 2018
Author(s)
Ian B. Spielman, Gediminas Juzeli?nas, Tomas Andrijauskas
We describe a novel technique for creating an artificial magnetic field for ultra-cold atoms using a periodically pulsed pair of counter propagating Raman lasers that drive transitions between a pair of internal atomic spin states: a multi-frequency

Note: Detection of a single cobalt microparticle with a microfabricated atomic magnetometer

August 23, 2011
Author(s)
Svenja A. Knappe, D. Maser, S. Pandey, H. Ring, Micah P. Ledbetter, John E. Kitching, Dimitry Budkerl
Detection of the magnetic signal of a single, 2 {um}m cobalt microparticle using an atomic magnetometer based on a microfabricated vapor cell is presented. These results represent an improvement by a factor of 10 in terms of the detected magnetic moment

Ferrite Ceramics at Microwave Frequencies

January 1, 2001
Author(s)
Richard G. Geyer
Ferrite ceramics are widely used in microwave devices to control transmission path, frequency, amplitude, and phase of microwave signals. Accurate dielectric and magnetic property measurements at the operational frequency and temperature ranges are needed

Multispectral MR imaging and sensing using shaped nanoparticles

November 26, 2016
Author(s)
Gary Zabow
The idea that size and shape can determine color is well known in optics-based quantum dot and plasmonic nanoparticle fields. But what about in the radio-frequency (RF) portion of the spectrum? This chapter reviews recent work on specially shaped magnetic

An ultra-low noise bipolar current source

June 6, 2023
Author(s)
Ian Spielman, Alessandro Restelli, Mingshu Zhao, Junheng Tao, Qiyu Liang
The precise control of dc magnetic fields is crucial in wide range of experimental platforms, from ultracold quantum gases, nuclear magnetic resonance, to precision measurements. In each of these cases the Zeeman effect causes quantum states to shift in

Phase Separation Enhanced Magneto-Electric Coupling in La 0.7 Ca 0.3 MnO 3 /BaTiO 3 Ultra-thin Films

December 9, 2015
Author(s)
A. Alberca, C. Munuera, Brian Kirby, N. M. Nemes, A. M. Perez-Munoz, J. Tornos, F. J. Mompean, C. Leon, J. Santamaria, M. Garcia-Hernandez
We study the origin of the magnetoelectric coupling in manganite films on ferroelectric substrates. We find large magnetoelectric coupling in La 0.7Ca 0.3MnO 3/BaTiO 3 ultra-thin films in experiments based on the converse magnetoelectric effect. The

Quantitative magnetometry of ferromagnetic nanorods by microfluidic analytical magnetophoresis

September 3, 2015
Author(s)
Andrew L. Balk, Lamar O. Mair, Feng Guo, Carlos M. Hangarter, Pramod Mathai, Robert D. McMichael, Samuel M. Stavis, John Unguris
We introduce an implementation of magnetophoresis to measure the absolute magnetization of ferromagnetic nanorods dispersed in fluids, by analyzing the velocity of single nanorods under an applied magnetic field gradient. A microfluidic guideway prevents

Successive Phase Transitions and Extended Spin-Excitation Continuum in the S=1/2 Triangular-Lattice Antiferromagnet Ba 3 CoSb 2 ) 9

December 26, 2012
Author(s)
H. D. Zhou, Cenke Xu, A. M. Hallas, H. J. Silverstein, C. R. Wiebe, I. Umegaki, J. Q. Yan, T. P. Murphy, J.-H. Park, Yiming Qiu, John R. Copley, Jason S. Gardner, Y. Takano
Using magnetic, thermal and neutron measurements on single-crystal samples, we show that Ba 3CoSb 2O 9 is a spin-1/2 triangular-lattice antiferromagnet with easy-axis anisotropy and two magnetic phase transitions bracketing an intermediate up-up-down phase

Evidence for Electrical Spin Injection Into Silicon

October 16, 2008
Author(s)
Cindi L. Dennis, J F. Gregg, G J. Ensell, S M. Thompson
Electrical spin injection into silicon was studied in a ferromagnet/insulator/silicon/insulator/ferromagnet structure, where the insulator is Si3N4. Si3N4 barriers conduct by hopping conduction (HC) at low voltages, but switch to Fowler-Nordheim tunneling

Spinor Dynamics in an Antiferromagnetic Spin-1 Condensate

August 16, 2007
Author(s)
A T. Black, Eduardo Gomez, Lincoln Turner, Sebastian Jung, Paul D. Lett
We observed coherent spin oscillations in an antiferromagnetic spin-1 Bose-Einstein condensate of sodium. The variation of the spin oscillations with magnetic field shows a clear signature of nonlinearity, in agreement with theoretical predictions that

A Comparison of Measurement Methods for Alcohol-Based Hand Sanitizers

February 26, 2021
Author(s)
Mary Bedner, Jacolin Murray, Aaron A. Urbas, William A. MacCrehan, Walter Brent Wilson
The production and demand for hand sanitizers have increased dramatically during the coronavirus disease 2019 (COVID-19) health emergency. To be deemed effective and safe, hand sanitizers should contain at least 60 % alcohol (typically ethanol) as well as

A method to quantify composition, purity, and cross-link density of the polyamide active layer in reverse osmosis composite membranes using 13C cross-polarization magic angle spinning nuclear magnetic resonance spectroscopy

February 12, 2022
Author(s)
Ryan Nieuwendaal, Christopher Stafford, Jeff Wilbur
… membranes was developed, enabling quantitative nuclear magnetic resonance (NMR) measurements of the composition and … using 13C cross-polarization magic angle spinning nuclear magnetic resonance spectroscopy …

Insight into the Spin Reorientation Phase Transition in the Magnetocaloric NdNi Compound

April 1, 2025
Author(s)
Yawei Gao, Xinqi Zheng, Hui Wu, Juping Xu, He Huang, Dingsong Wang, Hao Liu, Shanshan Zhen, Yang Pan, Lei Xi, Guyue Wang, Zixiao Zhang, Guangrui Zhang, Anxu Ma, Zhe Chen, Dan Liu, Zhaojun Mo, Jiawang Xu, Wen Yin, Shouguo Wang, Baogen Shen
Exploring and comprehending magnetocaloric materials with spin reorientation (SR) phase transition is of vital importance for practical applications of magnetocaloric effect (MCE). Herein, this study presents a systematic study on the magnetic properties,

Symmetry-breaking inelastic wave-mixing atomic magnetometry

December 1, 2017
Author(s)
Feng Zhou, Edward W. Hagley, Lu Deng, Chengjie Zhu
The nonlinear magneto-optical rotation (NMOR) effect has prolific applications ranging from precision mapping of Earth's magnetic field to biomagnetic sensing. Studies on collisional spin relaxation effects have led to ultrahigh magnetic field

Neutron Powder Diffraction of Carbon-Coated FeCo Alloy Nanoparticles

June 1, 1999
Author(s)
J H. Scott, K Chowdary, Z Turgut, S. A. Majetich, M E. McHenry
Neutron powder diffraction is used to study the order-disorder transformation in carbon-coated Fe xCo 1-x nanoparticles produced using a radio frequency (RF) plasma torch. The nanoparticles, nominally Fe 50Co 50, are produced from alloy powder and

Bubble magnetometry of nanoparticle heterogeneity and interaction

June 7, 2019
Author(s)
Andrew L. Balk, Ian J. Gilbert, R. Ivkov, John Unguris, Samuel Stavis
Bubbles have a rich history as transducers in particle-physics experiments. In a solid-state analogue, we use bubble domains in nanomagnetic films to measure magnetic nanoparticles. This technique can determine the magnetic orientation of a single

Optimization of Spin-triplet Supercurrent in Ferromagnetic Josephson Junctions

March 20, 2012
Author(s)
Benjamin James McMorran, Theresa Ginley, Julie Borchers, Brian Kirby, Brian B. Maranville, John Unguris
In the past year, several groups have observed evidence for long-range spin-triplet, supercurrent in Josephson junctions containing ferromagnetic (F) materials. In our work, the spin-triplet pair correlations are created by non-collinear magnetizations
Displaying 1751 - 1775 of 3361
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