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Search Publications by: Julie A. Borchers (Fed)

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Displaying 1 - 25 of 80

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

June 5, 2023
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

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

November 17, 2021
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
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 3 As 2 , with a metallic ferromagnet,Ni 0.80 Fe 0.20 (permalloy). The spin-charge interconversion is

Magnetic depth profiling Co/Cu multilayers to investigate magnetoresistance

October 12, 2021
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
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−x GeTe 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

Magnetic Particle Self-Assembly at Functionalized Interfaces

April 13, 2021
Apurve Saini, Katharina Theis-Brohl, Alexandros Koutsioubas, Kathryn L. Krycka, Julie Borchers, Max Wolff
We study the assembly of magnetite nanoparticles in water-based ferrofluids in wetting layers close to silicon substrates with different functionalization without and with an out-of-plane magnetic field. For particles of nominal sizes 5 nm, 15 nm and 25 nm

Observation of Anti-Damping Spin-Orbit Torques Generated by In-Plane and Out-of-Plane Spin Polarizations in MnPd 3

December 16, 2020
Mahendra DC, Ding-Fu Shao, Vincent D.-H. Hou, Patrick Quarterman, Ali Habiboglu, Brooks Venuti, Masashi Miura, Brian Kirby, Arturas Vailionis, Chong Bi, Xiang Li, Fen Xue, Yen-Lin Huang, Yong Deng, Shy-Jay Lin, Wilman Tsai, Serena Eley, Weigang Wang, Julie A. Borchers, Evgeny Y. Tsymbal, Shan X. Wang
High spin-orbit torques (SOTs) generated by topological materials and heavy metals interfaced with a ferromagnetic layer show promise for next generation magnetic memory and logic devices. SOTs generated from the in-plane spin polarization along y-axis

Large Exchange Splitting in Monolayer Graphene Magnetized by an Antiferromagnet

September 30, 2020
Yingying Wu, Gen Yin, Lei Pan, Alexander Grutter, Quanjun Pan, Albert Lee, Dustin A. Gilbert, Julie A. Borchers, William D. Ratcliff, Ang Li, Xiao-dong Han, Kang L. Wang
Spin splitting in graphene has been identified as a key component for unlocking multifunctionality with low dissipation and long-distance spin transport. Magnetic proximity effects are an extremely promising route to realizing exchange splitting in

Layering of Magnetic Nanoparticles at Amorphous Magnetic Templates with Perpendicular Anisotropy

August 26, 2020
Apurve Saini, Julie Borchers, Sebastian George, Brian B. Maranville, Kathryn L. Krycka, Joseph Dura, Katharina Theis-Brohl, Max Wolff
We reveal the assembly of monodisperse magnetite nanoparticles of sizes 5 nm, 15 nm and 25 nm from dilute water-based ferrofluids onto an amorphous magnetic template with out-ofplane anisotropy. From neutron reflectometry experiments we extract density

Termination Switching of Antiferromagnetic Proximity Effect in Topological Insulator

August 12, 2020
Chao-Yao Yang, Lei Pan, Alexander Grutter, Haiying Wang, Xiaoyu Che, Qing L. He, Yingying Wu, Dustin A. Gilbert, Padraic Shafer, Elke Arenholz, Hao Wu, Gen Yin, Peng Deng, Julie Borchers, William D. Ratcliff, Kang L. Wang
The magnetic proximity effect (MPE) allows exchange-coupling of topological insulators (TIs) with magnetically ordered materials to break time-reversal-symmetry and open a gap in the Dirac-cone surface state, with the goal of realizing quantum anomalous

Ferromagnetism in van der Waals Compound MnSb 1.8 Bi 0.2 Te 4

June 11, 2020
Yangyang Chen, Ya-Wen Chuang, Seng Huat Lee, Yanglin Zhu, Kevin Honz, Yingdong Guan, Yu Wang, Ke Wang, Zhiqiang Mao, Jun Zhu, Colin A. Heikes, Patrick Quarterman, P. Zajdel, Julie Borchers, William D. Ratcliff
The intersection of topology and magnetism represent a new playground to discover novel quantum phenomena and new device concepts. In this work, we show that a van der Waals compound MnSb 1.8 Bi 0.2 Te 4 exhibits a ferromagnetic ground state with a Curie

Magnetic Field Frustration of the Metal-Insulator Transition in V 2 O 3

June 1, 2020
J. Trastoy, A. Camjayi, J. del Valle, Y. Kalcheim, J.-P. Crocombette, Dustin A. Gilbert, Julie Borchers, J. E. Villegas, D. Ravelosona, M. J. Rozenberg, Ivan K. Schuller
Despite decades of efforts, the origin of metal-insulator transitions (MITs) in strongly-correlated materials remains one of the main longstanding problems in condensed-matter physics. An archetypal example is V 2 O 3 , which undergoes simultaneous

Dysprosium Iron Garnet Thin Films with Perpendicular Magnetic Anisotropy on Silicon

January 1, 2020
Jackson J. Bauer, Ethan R. Rosenberg, Subhajit Kundu, K. Andre Mkhoyan, Patrick Quarterman, Alexander Grutter, Brian Kirby, Julie Borchers, Caroline A. Ross
Magnetic insulators, such as the rare-earth iron garnets, are promising materials for energy-efficient spintronic memory and logic devices, and their anisotropy, magnetization and other properties can be tuned over a wide range through selection of the

Spin Scattering and Noncollinear Spin Structure-Induced Intrinsic Anomalous Hall Effect in Antiferromagnetic Topological Insulator MnBi 2 Te 4

August 19, 2019
Seng Huat Lee, Yanglin Zhu, Yu Wang, Leixin Miao, Timothy Pillsbury, Hemian Yi, Susan Kempinger, Jin Hu, Colin A. Heikes, Patrick Quarterman, William D. Ratcliff, Julie Borchers, Heda Zhang, Xianglin Ke, David Graf, Nasim Alem, Cui-Zu Chang, Nitin Samarth, Zhiqiang Mao
MnBi 2 Te 4 has recently been established as an intrinsic antiferromagnetic (AFM) topological insulator - an ideal platform to create quantum anomalous Hall (QAH) insulator and axion insulator states. We performed comprehensive studies on the structure

Nanoscale Magnetization Inhomogeneity within Single Phase Nanopillars

August 1, 2019
Thomas O. Farmer, Er-Jia Guo, Ryan D. Desautels, Lisa Debeer-Schmitt, Aiping Chen, Zhongchang Wang, Quanxi Jia, Julie Borchers, Dustin A. Gilbert, Ben Holladay, Sunil K. Sinha, Michael R. Fitzsimmons
We report observation of a radial dependence in the magnetic anisotropy of epitaxially strained CoFe 2 O 4 nanostructures in a BaTiO 3 matrix. This archetypal example of a multiferroic heterostructure with a self-assembling three dimensional architecture