Robert Streubel
Assistant Professor Physics & Astronomy
streubel@unl.edu
https://orcid.org/0000-0003-4783-892X

How to harness curvature and short-range order for 3D nanomagnetism?

Structural and chemical order of atoms and electron orbitals define magnetic properties of condensed matter. A microscopic magnetization forms as a result of magnetic interactions in long-range-ordered systems. Spin-orbit coupling between adjacent atoms, originating from the hybridization of electron orbitals, causes ferro-, ferri- or antiferromagnetism. Dipole interactions in weak-exchange-coupled materials or between nanostructures may lead to similar configurations at a larger length scale. Magnetic properties and novel functionalities are governed by the curvature and short-range order alongside elements and composition.

Our group seeks to understand the influence of curvature, structural and chemical disorder on 3D nanomagnetism in view of stabilizing non-collinear, topological spin textures, and to identify prospective applications. Our site is https:\\streubel.unl.edu

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2021

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Spontaneous fluctuations in a magnetic Fe/Gd skyrmion lattice, M. H. Seaberg, B. Holladay, S. A. Montoya, X. Y. Zheng, J. C.T. Lee, A. H. Reid, J. D. Koralek, L. Shen, V. Esposito, G. Coslovich, P. Walter, S. Zohar, V. Thampy, M. F. Lin, P. Hart, K. Nakahara, R. Streubel, S. D. Kevan, P. Fischer, W. Colocho, A. Lutman, F. J. Decker, E. E. Fullerton, M. Dunne, S. Roy, S. K. Sinha, and J. J. Turner

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Chiral Spin Textures in Amorphous Iron–Germanium Thick Films, Robert Streubel, D. Simca Bouma, Frank Bruni, Xiaoqian Chen, Peter Ercius, Jim Ciston, Alpha T. N'Diaye, Sujoy Roy, Steve D. Kevan, Peter Fischer, and Frances Hellman

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Magnetism in curved geometries, Robert Streubel, Evgeny Y. Tsymbal, and Peter Fischer

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Ferromagnetic resonances in single-crystal yttrium iron garnet nanofilms fabricated by metal-organic decomposition, Szu Fan Wang, Kayetan Chorazewicz, Suvechhya Lamichhane, Ronald A. Parrott, Stefano Cabrini, Peter Fischer, Noah Kent, John H. Turner, Takayuki Ishibashi, Zachary Parker Frohock, Jacob J. Wisser, Peng Li, Ruthi Zielinski, Bryce Herrington, Yuri Suzuki, Mingzhong Wu, Keiko Munechika, Carlos Pina-Hernandez, Robert Streubel, and Allen A. Sweet

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Ferromagnetic liquid droplets with adjustable magnetic properties, Xuefei Wu, Robert Streubel, Xubo Liu, Paul Y. Kim, Yu Chai, Qin Hu, Dong Wang, Peter Fischer, and Thomas P. Russell

2020

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Itinerant ferromagnetism and intrinsic anomalous Hall effect in amorphous iron-germanium, D. S. Bouma, Z. Chen, B. Zhang, F. Bruni, M. E. Flatté, A. Ceballos, R. Streubel, L. W. Wang, R. Q. Wu, and F. Hellman

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Skyrmion fluctuations at a first-order phase transition boundary, V. Esposito, X. Y. Zheng, M. H. Seaberg, S. A. Montoya, B. Holladay, A. H. Reid, R. Streubel, J. C.T. Lee, L. Shen, J. D. Koralek, G. Coslovich, P. Walter, S. Zohar, V. Thampy, M. F. Lin, P. Hart, K. Nakahara, P. Fischer, W. Colocho, A. Lutman, F. J. Decker, S. K. Sinha, E. E. Fullerton, S. D. Kevan, S. Roy, M. Dunne, and J. J. Turner

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Launching a new dimension with 3D magnetic nanostructures, Peter Fischer, Dédalo Sanz-Hernández, Robert Streubel, and Amalio Fernández-Pacheco

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Perspective: Ferromagnetic liquids, Robert Streubel, Xubo Liu, Xuefei Wu, and Thomas P. Russell

2019

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Generation and stability of structurally imprinted target skyrmions in magnetic multilayers, Noah Kent, Robert Streubel, Charles Henri Lambert, Alejandro Ceballos, Soong Gun Je, Scott Dhuey, Mi Young Im, Felix Büttner, Frances Hellman, Sayeef Salahuddin, and Peter Fischer

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Textured heterogeneity in square artificial spin ice, J. C.T. Lee, S. K. Mishra, V. S. Bhat, R. Streubel, B. Farmer, X. Shi, L. E. De Long, I. McNulty, P. Fischer, S. D. Kevan, and S. Roy

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Magnetization reversal and local switching fields of ferromagnetic Co/Pd microtubes with radial magnetization, Norbert Puwenberg, Christopher F. Reiche, Robert Streubel, Mishal Khan, Dipankar Mukherjee, Ivan V. Soldatov, Michael Melzer, Oliver G. Schmidt, Bernd Büchner, and Thomas Mühl

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X-ray ptychography on low-dimensional hard-condensed matter materials, Xiaowen Shi, Nicolas Burdet, Bo Chen, Gang Xiong, Robert Streubel, Ross Harder, and Ian K. Robinson

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Origin of enhanced anisotropy in FePt-C granular films revealed by XMCD, Robert Streubel, Alpha T. N'Diaye, Kumar Srinivasan, Antony Ajan, and Peter Fischer

2018

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Hartmann characterization of the PEEM-3 aberration-corrected X-ray photoemission electron microscope, A. Scholl, M. A. Marcus, A. Doran, J. R. Nasiatka, A. T. Young, A. A. MacDowell, R. Streubel, N. Kent, J. Feng, W. Wan, and H. A. Padmore

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Spatial and Temporal Correlations of XY Macro Spins, Robert Streubel, Noah Kent, Scott Dhuey, Andreas Scholl, Steve Kevan, and Peter Fischer

2017

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Three-dimensional nanomagnetism, Amalio Fernández-Pacheco, Robert Streubel, Olivier Fruchart, Riccardo Hertel, Peter Fischer, and Russell P. Cowburn

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Nanosecond X-Ray Photon Correlation Spectroscopy on Magnetic Skyrmions, M. H. Seaberg, B. Holladay, J. C.T. Lee, M. Sikorski, A. H. Reid, S. A. Montoya, G. L. Dakovski, J. D. Koralek, G. Coslovich, S. Moeller, W. F. Schlotter, R. Streubel, S. D. Kevan, P. Fischer, E. E. Fullerton, J. L. Turner, F. J. Decker, S. K. Sinha, S. Roy, and J. J. Turner

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Vortex circulation patterns in planar microdisk arrays, Sven Velten, Robert Streubel, Alan Farhan, Noah Kent, Mi Young Im, Andreas Scholl, Scott Dhuey, Carolin Behncke, Guido Meier, and Peter Fischer

2016

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Magnetism in curved geometries, Robert Streubel, Peter Fischer, Florian Kronast, Volodymyr P. Kravchuk, Denis D. Sheka, Yuri Gaididei, Oliver G. Schmidt, and Denys Makarov

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Vortex circulation and polarity patterns in closely packed cap arrays, Robert Streubel, Florian Kronast, Christopher F. Reiche, Thomas Mühl, Anja U.B. Wolter, Oliver G. Schmidt, and Denys Makarov

2015

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Magnetization dynamics of imprinted non-collinear spin textures, Robert Streubel, Peter Fischer, Martin Kopte, Oliver G. Schmidt, and Denys Makarov

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Manipulating topological states by imprinting non-collinear spin textures, Robert Streubel, Luyang Han, Mi Young Im, Florian Kronast, Ulrich K. Rößler, Florin Radu, Radu Abrudan, Gungun Lin, Oliver G. Schmidt, Peter Fischer, and Denys Makarov

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Magnetic soft x-ray tomography of magnetic Swiss roll architectures, Robert Streubel, F. Kronast, P. Fischer, O. G. Schmidt, and D. Makarov

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Retrieving spin textures on curved magnetic thin films with full-field soft X-ray microscopies, Robert Streubel, Florian Kronast, Peter Fischer, Dula Parkinson, Oliver G. Schmidt, and Denys Makarov

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Reconfigurable large-area magnetic vortex circulation patterns, Robert Streubel, Florian Kronast, Ulrich K. Rößler, Oliver G. Schmidt, and Denys Makarov

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Magnetic chiral spin textures by imprinting, Robert Streubel, F. Kronast, U. Rössler, O. G. Schmidt, P. Fischer, and D. Makarov

2013

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Strain-mediated elastic coupling in magnetoelectric nickel/barium-titanate heterostructures, Robert Streubel, Denny Köhler, Rudolf Schäfer, and Lukas M. Eng

2012

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Out-of-surface vortices in spherical shells, Volodymyr P. Kravchuk, Denis D. Sheka, Robert Streubel, Denys Makarov, Oliver G. Schmidt, and Yuri Gaididei

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Equilibrium magnetic states in individual hemispherical permalloy caps, Robert Streubel, Volodymyr P. Kravchuk, Denis D. Sheka, Denys Makarov, Florian Kronast, Oliver G. Schmidt, and Yuri Gaididei

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Magnetic vortices on closely packed spherically curved surfaces, Robert Streubel, Denys Makarov, Florian Kronast, Volodymyr Kravchuk, Manfred Albrecht, and Oliver G. Schmidt