Modern Magnetic Systems
Note: This department has relocated.


2023


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Imaging of short-wavelength spin waves in a nanometer-thick YIG/Co bilayer

Talapatra, A., Qin, H., Schulz, F., Yao, L., Flajsman, L., Weigand, M., Wintz, S., van Dijken, S.

Applied Physics Letters, 122(20):202404, American Institute of Physics, Melville, NY, 2023 (article)

DOI [BibTex]

2023

DOI [BibTex]


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Nanoporous adsorbents for hydrogen storage

Hirscher, M., Zhang, L., Oh, H.

Applied Physics A, 129(2), Springer-Verlag Heidelberg, Heidelberg, 2023 (article)

DOI [BibTex]

DOI [BibTex]


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Seeding and emergence of composite skyrmions in a van der Waals magnet

Powalla, L., Birch, M. T., Litzius, K., Wintz, S., Yasin, F. S., Turnbull, L. A., Schulz, F., Mayoh, D. A., Balakrishnan, G., Weigand, M., Yu, X., Kern, K., Schütz, G., Burghard, M.

Advanced Materials, 35(12):2208930, Wiley-VCH, Weinheim, 2023 (article)

DOI [BibTex]

DOI [BibTex]


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Site-selective substitution and resulting magnetism in arc-melted perovskite ATiO3-delta (A \textequals Ca, Sr, Ba)

Yoon, S., Xie, W., Xiao, X., Checchia, S., Coduri, M., Schützendübe, P., Widenmeyer, M., Ebbinghaus, S. G., Balke, B., Weidenkaff, A., Schütz, G., Son, K.

Journal of the American Ceramic Society, 106(11):6778-6786, American Ceramic Society, Westerville, OH, USA, 2023 (article)

DOI [BibTex]

DOI [BibTex]


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ZIF-8 pellets as a robust material for hydrogen cryo-adsorption tanks

Balderas-Xicohténcatl, R., Villajos, J. A., Casabán, J., Wong, D., Maiwald, M., Hirscher, M.

ACS Applied Energy Materials, 6(18):9145-9152, American Chemical Society, Washington, DC, 2023 (article)

DOI [BibTex]

DOI [BibTex]


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Realization of a magnonic analog adder with frequency-division multiplexing

Schulz, F., Groß, F., Förster, J., Mayr, S., Weigand, M., Goering, E., Gräfe, J., Schütz, G., Wintz, S.

AIP Advances, 13(1), American Institute of Physics, Melville, NY, USA, 2023 (article)

DOI [BibTex]

DOI [BibTex]


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Spatially-resolved dynamic sampling of different phasic magnetic resonances of nanoparticle ensembles in a magnetotactic bacterium Magnetospirillum magnetotacticum

Feggeler, T., Lill, J., Günzing, D., Meckenstock, R., Spoddig, D., Efremova, M. V., Wintz, S., Weigand, M., Zingsem, B. W., Farle, M., Wende, H., Ollefs, K. J., Ohldag, H.

New Journal of Physics, 25(4):043010, IOP Publishing, Bristol, 2023 (article)

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DOI [BibTex]


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A squarate-pillared titanium oxide quantum sieve towards practical hydrogen isotope separation

Yan, Q., Wang, J., Zhang, L., Liu, J., Wahiduzzaman, M., Yan, N., Yu, L., Dupuis, R., Wang, H., Maurin, G., Hirscher, M., Guo, P., Wang, S., Du, J.

Nature Communications, 14, pages: 4189, Nature Publishing Group, London, 2023 (article)

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DOI [BibTex]


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20 K H2 physisorption on metal−organic frameworks with enhanced dormancy compared to liquid hydrogen storage

Park, J., Ha, J., Muhammad, R., Lee, H. K., Balderas-Xicohtencatl, R., Cheng, Y., Ramirez-Cuesta, A. J., Streppel, B., Hirscher, M., Moon, H. R., Oh, H.

ACS Applied Energy Materials, 6(18):9057-9064, American Chemical Society, Washington, DC, 2023 (article)

DOI [BibTex]

DOI [BibTex]


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Pump probe x-ray microscopy of photo-induced magnetization dynamics at MHz repetition rates

Gerlinger, K., Pfau, B., Hennecke, M., Kern, L., Will, I., Noll, T., Weigand, M., Gräfe, J., Traeger, N., Schneider, M., Günther, C. M., Engel, D., Schütz, G., Eisebitt, S.

Structural Dynamics, 10(2):024301, American Institute of Physics, Melville, NY, 2023 (article)

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DOI [BibTex]


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Voltage x-ray reflectometry: A method to study electric-field-induced changes to interfacial electronic structures

Ilse, S. E., Schütz, G., Goering, E.

Physical Review Letters, 131(3):036201, American Physical Society, Woodbury, N.Y., 2023 (article)

DOI [BibTex]

DOI [BibTex]


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Direct observation of Néel-type skyrmions and domain walls in a ferrimagnetic DyCo3 thin film

Luo, C., Chen, K., Ukleev, V., Wintz, S., Weigand, M., Abrudan, R., Prokes, K., Radu, F.

Communications Physics, 6, pages: 2018, Nature Publishing Group, London, 2023 (article)

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DOI [BibTex]


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Ferromagnetic order controlled by the magnetic interface of LaNiO3/ La2/3Ca1/3MnO3 superlattices

Soltan, S., Macke, S., Ilse, S. E., Pennycook, T., Zhang, Z. L., Christiani, G., Benckiser, E., Schütz, G., Goering, E.

Scientific Reports, 13, pages: 3847, Nature Publishing Group, London, UK, 2023 (article)

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DOI [BibTex]

2022


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Imaging magnonic frequency multiplication in nanostructured antidot lattices

Groß, F., Weigand, M., Gangwar, A., Werner, M., Schütz, G., Goering, E. J., Back, C. H., Gräfe, J.

Physical Review B, 106(1):014426, American Physical Society, Woodbury, NY, July 2022 (article)

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2022

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Toggle-like current-induced Bloch point dynamics of 3D skyrmion strings in a room temperature nanowire

Birch, M. T., Cortés-Ortuno, D., Litzius, K., Wintz, S., Schulz, F., Weigand, M., Stefancic, A., Mayoh, D. A., Balakrishnan, G., Hatton, P. D., Schütz, G.

Nature Communications, 13, pages: 3630, Nature Publishing Group, London, June 2022 (article)

DOI [BibTex]

DOI [BibTex]


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Oxygen hole character and lateral homogeneity in PrNiO2+delta thin films

Fürsich, K., Pons, R., Bluschke, M., Ortiz, R. A., Wintz, S., Schierle, E., Weigand, M., Logvenov, G., Schütz, G., Keimer, B., Benckiser, E.

Frontiers in Physics, 9, pages: 810220, Frontiers Media, Lausanne, January 2022 (article)

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DOI [BibTex]


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Roadmap on spin-wave computing

Chumak, A. V., Kabos, P., Wu, M., Abert, C., Adelmann, C., Adeyeye, A. O., Akerman, J., Aliev, F. G., Anane, A., Awad, A., Back, C. H., Barman, A., Bauer, G. E. W., Becherer, M., Beginin, E. N., Bittencourt, V. A. S. V., Blanter, Y. M., Bortolotti, P., Boventer, I., Bozhko, D. A., Bunyaev, S. A., Carmiggelt, J. J., Cheenikundil, R. R., Ciubotaru, F., Cotofana, S., Csaba, G., Dobrovolskiy, O. V., Dubs, C., Elyasi, M., Fripp, K. G., Fulara, H., Golovchanskiy, I. A., Gonzalez-Ballestero, C., Graczyik, P., Grundler, D., Gruszecki, P., Gubbiotti, G., Guslienko, K., Haldar, A., Hamdioui, S., Hertel, R., Hillebrands, B., Hioki, T., Houshang, A., Hu, C., Huebl, H., Huth, M., Iacocca, E., Jungfleisch, M. B., Kakazei, G. N., Khitun, A., Khymyn, R., Kikkawa, T., Kläui, M., Klein, O., Klos, J. W., Knauer, S., Koraltan, S., Kostylev, M., Krawczyk, M., Krivorotov, I. N., Kruglyak, V. V., Lachance-Quirion, D., Ladak, S., Lebrun, R., Li, Y., Lindner, M., Macedo, R., Mayr, S., Melkov, G. A., Mieszczak, S., Nakamura, Y., Nembach, H. T., Nikitin, A. A., Nikitov, S. A., Novosad, V., Otálora, J. A., Otani, Y., Papp, A., Pigeau, B., Pirro, P., Porod, W., Porrati, F., Qin, H., Rana, B., Reimann, T., Riente, F., Romero-Isart, O., Ross, A., Sadovnikov, A. V., Safin, A. R., Saitoh, E., Schmidt, G., Schultheiss, H., Schultheiss, K., Serga, A. A., Sharma, S., Shaw, J. M., Suess, D., Surzhenko, O., Szulc, K., Taniguchi, T., Urbánek, M., Usami, K., Ustinov, A. B., van der Sar, T., van Dijken, S., Vasyuchka, V. I., Verba, R., Viola Kusminskiy, S., Wang, Q., Weides, M., Weiler, M., Wintz, S., Wolski, S. P., Zhang, X.

IEEE Transactions on Magnetics, 58(6):0800172, Published by the Institute of Electrical and Electronics Engineers for the Magnetics Group, New York, NY, 2022 (article)

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DOI [BibTex]


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Tuning spin-orbit torques across the phase transition in VO2/NiFe heterostructure

Kim, J., Cramer, J., Lee, K., Han, D., Go, D., Salev, P., Lapa, P. N., Vargas, N. M., Schuller, I. K., Mokrousov, Y., Jakob, G., Kläui, M.

Advanced Functional Materials, 32(17):2111555, Wiley-VCH Verlag GmbH, Weinheim, 2022 (article)

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DOI [BibTex]


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Commensurate vortex-core switching in magnetic nanodisks at gigahertz frequencies

Gypens, P., Leliaert, J., Schütz, G., Van Waeyenberge, B.

Physical Review B, 105(9):094420, American Physical Society, Woodbury, NY, 2022 (article)

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DOI [BibTex]


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Chemical affinity of Ag-exchanged zeolites for efficient hydrogen isotrope separation

Zhang, L., Wulf, T., Baum, F., Schmidt, W., Heine, T., Hirscher, M.

Inorganic Chemistry, 61(25):9413-9420, American Chemical Society, Washington, DC, 2022 (article)

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DOI [BibTex]


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High-resolution kinoform X-ray optics printed via 405 nm 3d laser lithography

Sanli, U. T., Messer, T., Weigand, M., Lötgering, L., Schütz, G., Wegener, M., Kern, C., Keskinbora, K.

Advanced Materials Technologies, 7(9):2101695, Wiley, Weinheim, 2022 (article)

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DOI [BibTex]


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Single skyrmion generation via a vertical nanocontact in a 2D magnet-based heterostructure

Powalla, L., Birch, M. T., Litzius, K., Wintz, S., Schulz, F., Weigand, M., Scholz, T., Lotsch, B. V., Kern, K., Schütz, G., Burghard, M.

Nano Letters, 22(23):9236-9243, American Chemical Society, Washington, DC, 2022 (article)

DOI [BibTex]

DOI [BibTex]


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Isotope-selective pore opening in a flexible metal-organic framework

Bondorf, L., Fiorio, J. L., Bon, V., Zhang, L., Maliuta, M., Ehrling, S., Senkovska, I., Evans, J. D., Joswig, J., Kaskel, S., Heine, T., Hirscher, M.

Science Advances, 8(15):eabn7035, AAAS, Washington, 2022 (article)

DOI [BibTex]

DOI [BibTex]


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Magnesium- and intermetallic alloys-based hydrides for energy storage: modelling, synthesis and properties

Pasquini, L., Sakaki, K., Akiba, E., Allendorf, M. D., Alvares, E., Ares, J. R., Babai, D., Baricco, M., Bellosta von Colbe, J., Bereznitsky, M., Buckley, C. E., Cho, Y. W., Cuevas, F., de Rango, P., Dematteis, E. M., Denys, R. V., Dornheim, M., Fernández, J. F., Hariyadi, A., Hauback, B. C., Heo, T. W., Hirscher, M., Humphries, T. D., Huot, J., Jacob, I., Jensen, T. R., Jerabek, P., Kang, S. Y., Keilbart, N., Kim, H., Latroche, M., Leardini, F., Li, H., Ling, S., Lototskyy, M. V., Mullen, R., Orimo, S., Paskevicius, M., Pistidda, C., Polanski, M., Puszkiel, J., Rabkin, E., Sahlberg, M., Sartori, S., Santhosh, A., Sato, T., Shneck, R. Z., Sorby, M. H., Shang, Y., Stavila, V., Suh, J., Suwarno, S., Thu, L. T., Wan, L. F., Webb, C. J., Witman, M., Wan, C., Wood, B. C., Yartys, V. A.

Progress in Energy, 4(3):032007, IOP Science, Bristol, 2022 (article)

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DOI [BibTex]


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Research and development of hydrogen carrier based solutions for hydrogen compression and storage

Dornheim, M., Baetcke, L., Akiba, E., Ares, J., Autrey, T., Barale, J., Baricco, M., Brooks, K., Chalkiadakis, N., Charbonnier, V., Christensen, S., Bellosta von Colbe, J., Costamagna, M., Dematteis, E., Fernández, J., Gennett, T., Grant, D., Heo, T. W., Hirscher, M., Hurst, K., Lototskyy, M., Metz, O., Rizzi, P., Sakaki, K., Sartori, S., Stamatakis, E., Stuart, A., Stubos, A., Walker, G., Webb, C. J., Wood, B., Yartys, V., Zoulias, E.

Progress in Energy, 4(4):042005, IOP Science, Bristol, 2022 (article)

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DOI [BibTex]


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Fundamentals of hydrogen storage in nanoporous materials

Zhang, L., Allendorf, M. D., Balderas-Xicohténcatl, R., Broom, D. P., Fanourgakis, G. S., Froudakis, G. E., Gennett, T., Hurst, K. E., Ling, S., Milanese, C., Parilla, P. A., Pontiroli, D., Riccò, M., Shulda, S., Stavila, V., Steriotis, T. A., Webb, C. J., Witman, M., Hirscher, M.

Progress in Energy, 4(4):042013, IOP Science, Bristol, 2022 (article)

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DOI [BibTex]


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Skyrmions in synthetic antiferromagnets and their nucleation via electrical current and ultra-fast laser illumination

Juge, R., Sisodia, N., Larrañaga, J. U., Zhang, Q., Pham, V. T., Rana, K. G., Sarpi, B., Mille, N., Stanescu, S., Belkhou, R., Mawass, M., Novakovic-Marinkovic, N., Kronast, F., Weigand, M., Gräfe, J., Wintz, S., Finizio, S., Raabe, J., Aballe, L., Foerster, M., Belmeguenai, M., Buda-Prejbeanu, L. D., Pelloux-Prayer, J., Shaw, J. M., Nembach, H. T., Ranno, L., Gaudin, G., Boulle, O.

Nature Communications, 13, pages: 4807, Nature Publishing Group, London, 2022 (article)

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DOI [BibTex]


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X-ray holographic imaging of magnetic surface spirals in FeGe lamellae

Turnball, L. A., Littlehales, M. T., Wilson, M. N., Birch, M. T., Popescu, H., Jaouen, N., Verezhak, J. A. T., Balakrishnan, G., Hatton, P. D.

Physical Review B, 106(6):064422, American Physical Society, Woodbury, NY, 2022 (article)

DOI [BibTex]

DOI [BibTex]


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Nonstationary spin waves in a single rectangular permalloy microstrip under uniform magnetic excitation

Pile, S., Stienen, S., Lenz, K., Narkowicz, R., Wintz, S., Förster, J., Mayr, S., Buchner, M., Weigand, M., Ney, V., Lindner, J., Ney, A.

Physical Review B, 105(9):094415, American Physical Society, Woodbury, NY, 2022 (article)

DOI [BibTex]

DOI [BibTex]


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Hydrogen storage in complex hydrides: past activities and new trends

Dematteis, E. M., Amdisen, M. B., Autrey, T., Barale, J., Bowden, M. E., Buckley, C. E., Cho, Y. W., Deledda, S., Dornheim, M., de Jongh, P., Grinderslev, J. B., Gizer, G., Gulino, V., Hauback, B. C., Heere, M., Heo, T. W., Humphries, T. D., Jensen, T. R., Kang, S. Y., Lee, Y., Li, H., Li, S., Møller, K. T., Ngene, P., Orimo, S., Paskevicius, M., Polanski, M., Takagi, S., Wan, L., Wood, B. C., Hirscher, M., Baricco, M.

Progress in Energy, 4(3):032009, IOP Science, Bristol, 2022 (article)

DOI [BibTex]

DOI [BibTex]


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History-dependent domain and skyrmion formation in 2D van der Waals magnet Fe3GeTe2

Birch, M. T., Powalla, L., Wintz, S., Hovorka, O., Litzius, K., Loudon, J. C., Turnbull, L. A., Nehruji, V., Son, K., Bubeck, C., Rauch, T. G., Weigand, M., Goering, E., Burghard, M., Schütz, G.

Nature Communications, 13, pages: 3035, Nature Publishing Group, London, 2022 (article)

DOI [BibTex]

DOI [BibTex]


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A high frequency builder software for arbitrary radio frequency signal

Groß, F., Träger, N., Schulz, F., Weigand, M., Dippon, T., Gräfe, J.

Review of Scientific Instruments, 93(3):034704, AIP Publishing, Melville, NY, 2022 (article)

DOI [BibTex]

DOI [BibTex]


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Magnetic interlayer coupling between ferromagnetic SrRuO3 layers through a SrIrO3 spacer

Wysocki, L., Ilse, S. E., Yang, L., Goering, E., Gunkel, F., Dittmann, R., van Loosdrecht, P. H. M., Lindfors-Vrejoiu, I.

Journal of Applied Physics, 131(13):133902, AIP Publishing, New York, NY, 2022 (article)

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DOI [BibTex]


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Tailoring optical excitation to control magnetic skyrmion nucleation

Kern, L., Pfau, B., Schneider, M., Gerlinger, K., Deinhart, V., Wittrock, S., Sidiropoulos, T., Engel, D., Will, I., Günther, C. M., Litzius, K., Wintz, S., Weigand, M., Büttner, F., Eisebitt, S.

Physical Review B, 106(5):054435, American Physical Society, Woodbury, NY, 2022 (article)

DOI [BibTex]

DOI [BibTex]


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Tailoring morphological and chemical properties of covalent triazine frameworks for dual CO2 and H2 adsorption

Tuci, G., Iemhoff, A., Rossin, A., Yakhvarov, D., Gatto, M. F., Balderas-Xicohténcatl, R., Zhang, L., Hirscher, M., Palkovits, R., Pham-Huu, C., Giambastiani, G.

International Journal of Hydrogen Energy, 47(13):8434-8445, Elsevier, Amsterdam, 2022 (article)

DOI [BibTex]

DOI [BibTex]


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Deterministric generation and guided motion of magnetic skyrmions by focused He+-ion irradiation

Kern, L., Pfau, B., Deinhart, V., Schneider, M., Klose, C., Gerlinger, K., Wittrock, S., Engel, D., Will, I., Günther, C. M., Liefferink, R., Mentink, J. H., Wintz, S., Weigand, M., Huang, M., Battistelli, R., Metternich, D., Büttner, F., Höflich, K., Eisebitt, S.

Nano Letters, 22(10):4028-4035, American Chemical Society, Washington, DC, 2022 (article)

DOI [BibTex]

DOI [BibTex]


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Freezing and thawing magnetic droplet solitons

Ahlberg, M., Chung, S., Jiang, S., Frisk, A., Khademi, M., Khymyn, R., Awad, A. A., Tuan Le, Q., Mazraati, H., Mohseni, M., Weigand, M., Bykova, I., Groß, F., Goering, E., Schütz, G., Gräfe, J., Åkerman, J.

Nature Communications, 13, pages: 2462, Nature Publishing Group, London, 2022 (article)

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DOI [BibTex]


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Current-induced Néel order switching facilitated by magnetic phase transition

Wu, H., Zhang, H., Wang, B., Groß, F., Yang, C., Li, G., Guo, C., He, H., Wong, K., Wu, D., Han, X., Lai, C., Gräfe, J., Cheng, R., Wang, K. L.

Nature Communications, 13, Nature Publishing Group, London, 2022 (article)

DOI [BibTex]

DOI [BibTex]


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Hydrogen isotope separation using a metal-organic cage built from macrocycles

He, D., Zhang, L., Liu, T., Clowes, R., Little, M. A., Liu, M., Hirscher, M., Cooper, A. I.

Angewandte Chemie International Edition, 61(32):e202202450, Wiley-VCH, Weinheim, 2022 (article)

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DOI [BibTex]


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Formation of a super-dense hydrogen monolayer on mesoporous silica

Balderas-Xicohténcatl, R., Lin, H., Lurz, C., Daemen, L., Cheng, Y., Cychosz Struckhoff, K., Guillet-Nicolas, R., Schütz, G., Heine, T., Ramirez-Cuesta, A. J., Thommes, M., Hirscher, M.

Nature Chemistry, 14(11):1319-1324, Nature Publishing Group, London, UK, 2022 (article)

DOI [BibTex]

DOI [BibTex]


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Role of substrate clamping on anisotropy and domain structure in the canted antiferromagnet α-Fe2O3

Wittmann, A., Gomonay, O., Litzius, K., Kaczmarek, A., Kossak, A. E., Wolf, D., Lubk, A., Johnson, T. N., Tremsina, E. A., Churikova, A., Büttner, F., Wintz, S., Mawass, M., Weigand, M., Kronast, F., Scipioni, L., Shepard, A., Newhouse-Illige, T., Greer, J. A., Schütz, G., Birge, N. O., Beach, G. S. D.

Physical Review B, 106(22):224419, American Physical Society, Woodbury, NY, 2022 (article)

DOI [BibTex]

DOI [BibTex]


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Enhanced skyrmion metastability under applied strain in FeGe

Littlehales, M. T., Turnbull, L. A., Wilson, M. N., Birch, M. T., Popescu, H., Jaouen, N., Verezhak, J. A. T., Balakrishnan, G., Hatton, P. D.

Physical Review B, 106(21):214434, American Physical Society, Woodbury, NY, 2022 (article)

DOI [BibTex]

DOI [BibTex]


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Breathing mode dynamics of coupled three-dimensional chiral bobbers

Bassirian, P., Hesjedal, T., Parkin, S. S. P., Litzius, K.

APL Materials, 10(10):101107, AIP Scitation, 2022 (article)

DOI [BibTex]

DOI [BibTex]


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Ferromagnetism and superconductivity in CaRuO3 / YBa2Cu3O7-δheterostructures

Ionescu, A. M., Ivan, I., Locovei, C., Onea, M., Crisan, A., Soltan, S., Schütz, G., Albrecht, J.

Materials, 15(7):2345, MDPI, Basel, 2022 (article)

DOI [BibTex]

DOI [BibTex]


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Terahertz spin-to-charge current conversion in stacks of ferromagnets and the transition-metal dichalcogenide NbSe2

Nádvornı́k, L., Gueckstock, O., Braun, L., Niu, C., Gräfe, J., Richter, G., Schütz, G., Takagi, H., Zeer, M., Seifert, T. S., Kubaščı́k, P., Pandeya, A. K., Anane, A., Yang, H., Bedoya-Pinto, A., Parkin, S. S. P., Wolf, M., Mokrousov, Y., Nakamura, H., Kampfrath, T.

Advanced Materials Interfaces, 9(36):2201675, Wiley-VCH, Weinheim, 2022 (article)

DOI [BibTex]

DOI [BibTex]


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Confinement of skyrmions in sanoscale FeGe device-like structures

Twitchett-Harrison, A. C., Loudon, J. C., Pepper, R. A., Birch, M. T., Fangohr, H., Midgley, P. A., Balakrishnan, G., Hatton, P. D.

ACS Applied Electronic Materials, 4(9):4427-4437, American Chemical Socitey, Washington, DC, 2022 (article)

DOI [BibTex]

DOI [BibTex]


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Asynchronous current-induced switching of rare-earth and transition-metal sublattices in ferromagnetic alloys

Sala, G., Lambert, C.-H., Finizio, S., Raposo, V., Krizakova, V., Krishnaswamy, G., Weigand, M., Raabe, J., Rossell, M. D., Martinez, E., Gambardella, P.

Nature Materials, 21(6):640-646, Nature Pub. Group, London, UK, 2022 (article)

DOI [BibTex]

DOI [BibTex]

2021


Light- and magnetically actuated FePt microswimmers
Light- and magnetically actuated FePt microswimmers

Kadiri, V. M., Günther, J., Kottapalli, S. N., Goyal, R., Peter, F., Alarcon-Correa, M., Son, K., Barad, H., Börsch, M., Fischer, P.

The European Physical Journal E, 44(6):74, June 2021 (article)

Abstract
Externally controlled microswimmers offer prospects for transport in biological research and medical applications. This requires biocompatibility of the swimmers and the possibility to tailor their propulsion mechanisms to the respective low Reynolds number environment. Here, we incorporate low amounts of the biocompatible alloy of iron and platinum (FePt) in its L10 phase in microstructures by a versatile one-step physical vapor deposition process. We show that the hard magnetic properties of L10 FePt are beneficial for the propulsion of helical micropropellers with rotating magnetic fields. Finally, we find that the FePt coatings are catalytically active and also make for Janus microswimmers that can be light-actuated and magnetically guided.

link (url) DOI [BibTex]

2021

link (url) DOI [BibTex]


Transient increase of Tc and Jc in superconducting/metallic heterostructures
Transient increase of Tc and Jc in superconducting/metallic heterostructures

Ionescu, A., Bihler, M., Simmendinger, J., Miksch, C., Fischer, P., Cristiani, G., Rabinovich, K., Schütz, G., Albrecht, J.

Materials Chemistry and Physics, 263, pages: 124390, February 2021 (article)

Abstract
The presence of a metallic layer can influence the properties of high-temperature superconductors underneath. We investigate the influence of metallic structures deposited in form of nanoparticles or continuous layers by electron beam evaporation or ion beam sputtering on the properties of Y1Ba2Cu3O7-x (YBCO) thin films. To generally avoid diffusion of metal atoms an additional barrier layer is introduced. Detailed measurements of the magnetic moment of the superconductor as a function of temperature and magnetic field have been performed using SQUID magnetometry. It is found that the modification of the superconducting properties of coated YBCO strongly depends on the deposition method of the metal on top rather than the type of metal (Ni or Ag), its magnetic properties (ferromagnetic or paramagnetic) or its morphology (nanoparticles or thin film). The main result is a transient increase of the critical temperature Tc and critical current density Jc that was observed for samples prepared by electron beam evaporation.

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