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Search Publications by: Julie A. Borchers (Fed)

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Displaying 126 - 150 of 171

Particle Moment Canting in CoFe 2 O 4 Nanoparticles

November 19, 2014
Author(s)
K. Hasz, Y. Ijiri, Kathryn L. Krycka, Julie Borchers, R. A. Booth, S. Oberdick, S. A. Majetich
Polarization-analyzed small-angle neutron scattering methods are used to determine the spin morphology in high crystalline anisotropy, 11 nm diameter CoFe 2O 4 nanoparticle assemblies with randomly oriented easy axes. In moderate to high magnetic fields

Origin of Surface Canting Within Fe 3 O 4 Nanoparticles

October 2, 2014
Author(s)
Kathryn L. Krycka, Julie A. Borchers, R. A. Booth, Y. Ijiri, K. Hasz, J. J. Rhyne, S. A. Majetich
The nature of near-surface spin canting within Fe 3O 4 nanoparticles is highly debated. Here we develop a neutron scattering asymmetry analysis which quantifies the spin canting angle to between 23° and 42° at 1.2 T. Simultaneously, an energy-balance model

Deposition Order Dependent Magnetization Reversal of Pressure Graded Co/Pd Films

April 15, 2014
Author(s)
P. K. Greene, Brian Kirby, June W. Lau, Julie Borchers, M .R. Fitzsimmons, Kai Liu
Magnetization reversal mechanisms have been investigated in pressure graded Co/Pd multilayer thin films with inverted deposition orders. Structural and magnetic properties have been investigated using x-ray diffraction, transmission electron microscopy

Interdependence Between Training and Magnetization Reversal in Granular Co-CoO Exchange Bias Systems

April 9, 2014
Author(s)
E. Menendez, T. Dias, J. Geshev, J. F. Lopez-Barbera, J. Nogues, R. Steitz, Brian Kirby, Julie Borchers, L.M.C. Pereira, A. Vantomme, K. Temst
The interdependence between training and magnetization reversal in granular Co-CoO exchange bias systems prepared by O ion implantation in Co thin films is demonstrated by polarized neutron reflectometry. The implantations result in rather uniform O depth

Effect of Capping Material on Interfacial Ferromagnetism in FeRh Thin Films

January 31, 2014
Author(s)
C. Baldasseroni, G. K. Palsson, C. Bordel, S. Valencia, A. A. Unal, F. Kronast, S. Nemsak, C. S. Fadley, Julie Borchers, Brian B. Maranville, F. Hellman
The role of the capping material in stabilizing a thin ferromagnetic layer at the interface between an FeRh film and cap in the nominally antiferromagnetic phase at room temperature was studied by x-ray magnetic circular dichroism in photoemission electron

Ferromagnetism in Bi 2 Se 3 :Mn Epitaxial Layers

August 30, 2013
Author(s)
H.J. von Bardeleben, J.L. Cantin, D. M. Zhang, A. Richardella, D. W. Rench, N. Samarth, Julie Borchers
The magnetism in approximatley}1at% Mn doped nanometric Bi 2Se 3 epitaxial layers has been studied by ferromagnetic resonance (FMR), magnetometry and polarized neutron reflectivity (PNR) measurements. The FMR results reveal the formation of an intrinsic

Polarization-Analyzed Small-Angle Neutron Scattering. II. Mathematical Angular Analysis

June 1, 2012
Author(s)
Kathryn L. Krycka, Julie A. Borchers, Yumi Ijiri, Ryan Booth, Sara Majetich
SANS with longitudinal polarization analysis is a powerful technique to study magnetic morphology and domain interactions with directional sensitivity on the nancoscale. Here, by explicitly isolating the various nuclear-magnetic and magnetic-magnetic

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

X-ray and Neutron Reflectivity and Electronic Properties of PCBM-poly(bromo)styrene Blends and Bilayers with Poly(3-hexylthiophene)

March 1, 2012
Author(s)
Stuart B. Kirschner, Nathaniel P. Smith, Kevin A. Wepasnick, Howard E. Katz, Brian Kirby, Julie Borchers, Daniel H. Reich
We used neutron reflectivity to complement x-ray reflectivity characterization of PCMB-based layers formed on poly(3-hexylthiophene) (P3HT). Single-layer analyses were used to provide reliable scattering length density values for bilayer fitting. Atomic

Nanometer Size Magnetic Domains and Coherent Magnetization Reversal in a Giant Exchange Bias System

August 23, 2011
Author(s)
C. Dufour, M .R. Fitzsimmons, Julie Borchers, M. Laver, Kathryn L. Krycka, K. Dumesnil, Shannon M. Watson, Wangchun Chen, S. Singh
We present compelling evidence obtained with small angle scattering of unpolarized and polarized neutron beams the magnetization reversal occurs via formation of 10-100's nm sized magnetic domains in an exchanged biased DyFe 2/YFed2^ superlattice. The
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