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Search Publications by: Julie A. Borchers (Fed)

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Displaying 101 - 125 of 170

Large Energy Product Enhancement in Perpendicularly Coupled MnBi/CoFe Magnetic Bilayers

August 29, 2016
Author(s)
T. R. Gao, L. Fang, S. Fackler, S. Maruyama, X. H. Zhang, L. L. Wang, T. Rana, P. Manchanda, A. Kashyap, K. Janicka, A. L. Wysocki, A. T. N'Diaye, E. Arenholz, Julie Borchers, Brian Kirby, Brian B. Maranville, K. W. Sun, M. J. Kramer, V. P. Antropov, D. D. Johnson, R. Skomski, J. Cui, I. Takeuchi
Finding rare-earth free alternatives to Nd and Sm based permanent magnets has emerged as an urgent technological challenge due to the global economic impact of price instability of rare-earth elements. Among possible candidates, MnBi is one of the few

Structural and Magnetic Depth Profiles of Magneto-Ionic Heterostructures Beyond the Interface Limit

July 22, 2016
Author(s)
Dustin A. Gilbert, Alexander J. Grutter, Elke Arenholz, Kai Liu, Brian J. Kirby, Julie A. Borchers, Brian B. Maranville
Electric-field control of magnetism provides a promising route towards ultralow power information storage and sensor technologies. The effects of magneto-ionic motion have so far been prominently featured in the direct modification of interface chemical

Controllable Positive Exchange Bias via Redox-Driven Oxygen Migration

March 21, 2016
Author(s)
Dustin A. Gilbert, Justin Olamit, Randy K. Dumas, Brian J. Kirby, Alexander J. Grutter, Brian B. Maranville, Elke Arenholz, Julie A. Borchers, Kai Liu
We have observed oxygen migration across buried interfaces in Gd^xdx^Fe 1-x/NiCoO films, which leads to tunable positive exchange bias over a relatively small cooling field range of 300 mT. The tunability is shown to be the result of an interfacial layer

Reversible Control of Magnetism in La 0.67 Sr 0.33 MnO 3 through Chemically-Induced Oxygen Migration

February 24, 2016
Author(s)
Alexander J. Grutter, Dustin A. Gilbert, U. S. Alaan, E. Arenholz, Brian B. Maranville, Julie A. Borchers, Y. Suzuki, Kai Liu, Brian J. Kirby
We demonstrate reversible control of magnetization and anisotropy in La 0.67Sr 0.33MnO 3 films through interfacial oxygen migration. Gd metal capping layers deposited onto La 0.67Sr 0.33MnO 3 leach Oxygen from the film through a solid-state redox reaction

Realization of Ground-State Artificial Skyrmion Lattices at Room Temperature

October 8, 2015
Author(s)
Dustin A. Gilbert, Brian B. Maranville, Andy L. Balk, Brian J. Kirby, Peter Fischer, Daniel T. Pierce, John Unguris, Julie A. Borchers, Kai Liu
The topological nature of magnetic skyrmions deriving from broken symmetries leads to extraordinary static and dynamic properties that provide new insight in fundamental problems of magnetism and exciting potentials for exploitation in novel magnetic

Electric Field Control of Interfacial Ferromagnetism in CaMnO 3 /CaRuO 3 Heterostructures

July 24, 2015
Author(s)
Alexander J. Grutter, Brian J. Kirby, M. T. Gray, C. L. Flint, U. S. Alaan, Y. Suzuki, Julie A. Borchers
A key milestone for the development of low-power spintronic devices is electric field control of ferromagnetism. To that end, we have probed the electric field dependence of the emergent ferromagntic layer at CaRuO 3/CaMnO 3 interfaces in bilayers

Self Assembly of Magnetic Nanoparticles at Silicon Surfaces

June 21, 2015
Author(s)
Katharina Theis-Brohl, Philipp Gutfreund, Alexei Vorobiev, Max Wolff, Boris P. Toperverg, Joseph Dura, Julie Borchers
Neutron reflectometry was used to study the assembly of magnetite nanoparticles in a water-based ferrofluid close to a silicon surface, Under three conditions, static, under shear and with a magnetic field, the depth profile is extracted. The particles

Internal Magnetic Structure of Nanoparticles Dominates Time-Dependent Relaxation Processes in a Magnetic Field

June 2, 2015
Author(s)
Cindi L. Dennis, Kathryn L. Krycka, Julie Borchers, Ryan D. Desautels, Johan van Lierop, Natalie F. Huls, Andrew J. Jackson, Cordula Gruettner, Robert Ivkov
Time-dependent relaxation of nanomagnets, such as magnetic nanoparticles, have applications in many disciplines of science and technology because these magnets can exhibit hysteresis and loss power when exposed to AC magnetic fields. In particular, the

Magnetic Structure and Ordering of Multiferroic Hexagonal LuFeO 3

May 29, 2015
Author(s)
Steven M. Disseler, Julie A. Borchers, Charles M. Brooks, Julia A. Mundy, Jarrett A. Moyer, Daniel A. Hillsberry, Eric L. Thies, Dmitri A. Tenne, John Heron, Megan Holtz, James D. Clarkson, Gregory M. Stiehl, Peter Schiffer, David A. Muller, Darrell G. Schlom, William D. Ratcliff
We report on the magnetic structure and ordering of hexagonal LuFeO 3 films of variable thickness grown by molecular-beam epitaxy (MBE) on YSZ (111) and Al 2O 3 (0001) substrates. These crystalline films exhibit long-range structural uniformity dominated

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