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Search Publications by: Julie A. Borchers (Fed)

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Displaying 1 - 25 of 170

Skyrmion Lattice Formation and Destruction Mechanisms Probed with TR-SANS

April 30, 2024
Author(s)
W. L. N. C. Liyanage, Nan Tang, Rebecca Dally, Lizabeth J. Quigley, C. Buchanan, Guo-Jiun Shu, Nicholas Butch, Kathryn Krycka, Markus Bleuel, Julie A. Borchers, Debeer-Schmitt Lisa, Dustin Gilbert
Magnetic skyrmions are topologically protected, nanoscale whirls of the spin configuration that tend to form hexagonally ordered arrays. As a topologically non-trivial structure, the nucleation and annihilation of the skyrmion, as well as the interaction

Constraints on Proximity-Induced Ferromagnetism in a Dirac Semimetal (Cd3As2)/ferromagnetic Semiconductor (Ga1-xMnxSb)heterostructure

June 5, 2023
Author(s)
Arpita Mitra, Run Xiao, Wilson Yanez, Yongxi Ou, Juan Chamorro, Tyrel M. McQueen, Alexander Grutter, Julie Borchers, Michael R. Fitzsimmons, Timothy Charlton, Nitin Samarth
Breaking time-reversal symmetry in a Dirac semimetal Cd3As2 through doping with magnetic ions or by the magnetic proximity effect is expected to cause a transition to other topological phases (such as a Weyl semimetal). To this end, we investigate the

Skyrmion-Excited Spin-Wave Fractal Networks

August 18, 2023
Author(s)
Nan Tang, W. L. N. C. Liyanage, Sergio A. Montoya, Sheena Patel, Lizabeth J. Quigley, Alexander Grutter, Michael R. Fitzsimmons, Sunil Sinha, Julie A. Borchers, Eric E. Fullerton, Lisa Debeer-Schmitt, Dustin A. Gilbert
Magnetic skyrmions exhibit unique, technologically relevant pseudo-particle behaviors which arise from their topological protection, including well-defined, three-dimensional breathing and gyration modes which occur at microwave frequencies. During dynamic

Influence of Hard/Soft Layer Ordering on Magnetization Reversal of Bimagnetic Nanoparticles: Implications for Biomedical/Theranostic Applications

June 14, 2023
Author(s)
Corisa Kons, Kathryn L. Krycka, Joshua Robles, Nikolaos Ntallis, Manuel Pereiro, Manh-Huong Phan, Hariharan Srikanth, Julie A. Borchers, Dario A. Arena
We investigate the spatial distribution of spin orientation in magnetic nanoparticles consisting of hard and soft magnetic layers. The nanoparticles are synthesized in a core / shell spherical morphology where the magnetically hard, high anisotropy layer

Three-Dimensional Structure of Hybrid Magnetic Skyrmions Determined by Neutron Scattering

May 5, 2023
Author(s)
W. L. N. C. Liyanage, Nan Tang, Lizabeth J. Quigley, Julie A. Borchers, Alexander Grutter, Brian B. Maranville, Sunil Sinha, Nicolas Reyren, Sergio A. Montoya, Eric E. Fullerton, Lisa Debeer-Schmitt, Dustin A. Gilbert
Magnetic skyrmions are topologically protected chiral spin structures which present opportunities for next-generation magnetic data storage and logic information technologies. The topology of these structures originates in the geometric configuration of

Absence of Magnetic Interactions in Ni-Nb Ferromagnet-Superconductor Bilayers

March 28, 2023
Author(s)
Nathan Satchell, Patrick Quarterman, Julie A. Borchers, Gavin Burnell, Norman Birge
Studies of ferromagnet-superconductor hybrid systems have uncovered magnetic interactions between the competing electronic orderings. The Electromagnetic Proximity Effect predicts the formation of a spontaneous vector potential inside a superconductor

Chemically Induced Magnetic Dead Shells in Superparamagnetic Ni Nanoparticles Deduced from Polarized Small-Angle Neutron Scattering

July 17, 2022
Author(s)
Bhaskar Das, Joseph Batley, Kathryn L. Krycka, Julie A. Borchers, Patrick Quarterman, Caroline Korostynski, My Nguyen, Ishita Kamboj, Eray Aydil, Chris Leighton
Advances in synthesis and characterization of colloidal magnetic nanoparticles (NPs) have yielded great gains in the understanding of their complex magnetic behavior, with implications for numerous applications. Recent work using Ni NPs as a model soft

Chiral Spin Bobbers in Exchange-Coupled Hard-Soft Magnetic Bilayers

November 17, 2021
Author(s)
X. H. Zhang, T. R. Gao, L. Fang, S. Fackler, Julie Borchers, Brian Kirby, Brian B. Maranville, S. E. Lofland, A. T. N'Diaye, E. Arenholz, A. Ullah, J. Cui, R. Skomski, Ichiro Takeuchi
The spin structure of exchange-coupled MnBi:Co-Fe bilayers is investigated by X-ray magnetic circular dichroism (XMCD), polarized neutron reflectometry (PNR), and micromagnetic simu-lations. The purpose of the present research is two-fold. First, the

Spin and Charge Interconversion in Dirac-Semimetal Thin Films

November 16, 2021
Author(s)
Wilson Yanez, Yongxi Ou, Run Xiao, Jahyun Koo, Jacob T. Held, Supriya Ghosh, Jeffrey Rable, Timothy Pillsbury, Enrique Gonzalez Delgado, Kezhou Yang, Juan Chamorro, Alexander Grutter, Patrick Quarterman, Anthony Richardella, Abhronil Sengupta, Tyrel M. McQueen, Julie Borchers, K. A. Mkhoyan, Binghai Yan, Nitin Samarth
We report spin-to-charge and charge-to-spin conversion at room temperature in heterostructure devices that interface an archetypal Dirac semimetal, Cd 3As 2, with a metallic ferromagnet,Ni 0.80Fe 0.20 (permalloy). The spin-charge interconversion is

Magnetic depth profiling Co/Cu multilayers to investigate magnetoresistance

October 12, 2021
Author(s)
John Unguris, D. Tulchinsky, Michael H. Kelley, Julie Borchers, Joseph Dura, Charles Majkrzak, S. Y. Hsu, R. Loloee, W. P. Pratt, J. Bass
The magnetic microstructure responsible for the metastable high resistance state of weakly coupled, as-prepared [Co(6nm)/Cu(6nm)] 20 multilayers was analyzed using polarized neutron reflectivity and scanning electron microscopy with polarization analysis

Magnetic Field-Induced Non-Trivial Electronic Topology in Fe 3-x GeTe 2

October 7, 2021
Author(s)
Juan Macy, Danilo Ratkovski, Purnima P. Balakrishnan, Mara Strungaru, Yu-Che Chiu, Aikaterini Flessa, Alex Moon, Wenkai Zheng, Ashley Weiland, Gregory T. McCandless, Julia Y. Chan, Govind S. Kumar, Michael Shatruk, Alexander Grutter, Julie Borchers, William D. Ratcliff, Eun S. Choi, Elton J. Santos, Luis Balicas
The anomalous Hall, Nernst and thermal Hall coefficients of the itinerant ferromagnet Fe 3−xGeTe 2 display several features upon cooling, like a reversal in the Nernst signal below T = 50 K pointing to a topological transition possibly associated to the