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5 results on '"Markus Waschk"'

1. Strain and electric field control of magnetism in La(1--x)SrxMnO3 thin films on ferroelectric BaTiO3 substrates

Author

Markus Schmitz, Alexander Weber, Oleg Petracic, Markus Waschk, Paul Zakalek, Stefan Mattauch, Alexandros Koutsioubas, and Thomas Brückel

Subjects
magneto-electric, polarized neutron reflectometry, ferromagnetic, ferroelectric, strain-induced coupling, electric field control, Science, Physics, QC1-999
Abstract

We report on the observation of strain- and magneto-electric coupling in a system consisting of a thin film of ferromagnetic La _(1− _x _) Sr _x MnO _3 (LSMO, x = 0.5 and 0.3) on a ferroelectric BaTiO _3 (BTO) substrate. Pronounced magnetization steps occur at the BTO structural phase transitions. We associate these steps with a strain induced change of the magnetic anisotropy. Temperature dependent magneto-electric coupling could be evidenced by the magnetic response to an applied AC electric field in all ferroelectric phases of the BTO substrate. In a DC electric field, the magnetization changes are asymmetric with respect to the polarity. Polarized neutron reflectometry hints to oxygen migration as possible mechanism for this asymmetry. It also reveals strain-induced magnetization changes throughout most of the thickness of 252 Å ( x = 0.5) and 360 Å ( x = 0.3), respectively, of the LSMO layer. We conclude that the change of the magnetization depth profile at the interface as previously proposed by ab initio calculations is not the relevant mechanism. Instead strain, oxygen vacancies and frustration at interfacial steps dominate the magnetic response to an applied electric field.

Published
2020
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2. Simultaneous observation of anti-damping and the inverse spin Hall effect in the La0.67Sr0.33MnO3/Pt bilayer system

Author

Anirban Sarkar, Subhankar Bedanta, Braj Bhusan Singh, Koustuv Roy, Markus Waschk, Thomas Brueckel, and Pushpendra Gupta

Subjects
Spin pumping, Materials science, Condensed matter physics, Spintronics, Magnetoresistance, Spin polarization, 02 engineering and technology, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, 021001 nanoscience & nanotechnology, 01 natural sciences, Ferromagnetic resonance, Condensed Matter::Materials Science, Hall effect, 0103 physical sciences, Spin Hall effect, Condensed Matter::Strongly Correlated Electrons, General Materials Science, 010306 general physics, 0210 nano-technology, ddc:600, Spin-½
Abstract

Manganites have shown potential in spintronics because they exhibit high spin polarization. Here, by ferromagnetic resonance we have studied the damping properties of La0.67Sr0.33MnO3/Pt bilayers which are prepared by oxide molecular beam epitaxy. The damping coefficient (α) of a La0.67Sr0.33MnO3 (LSMO) single layer is found to be 0.0104. However the LSMO/Pt bilayers exhibit a decrease in α with an increase in Pt thickness. This decrease in the value of α is probably due to high anti-damping like torque. Furthermore, we have investigated the angle dependent inverse spin Hall effect (ISHE) to quantify the spin pumping voltage from other spin rectification effects such as the anomalous Hall effect and anisotropic magnetoresistance. We have observed a high spin pumping voltage (∼20 μV). The results indicate that both anti-damping and spin pumping phenomena occur simultaneously.

Published
2021
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3. Simultaneous observation of anti-damping and the inverse spin Hall effect in the La

Author

Pushpendra, Gupta, Braj Bhusan, Singh, Koustuv, Roy, Anirban, Sarkar, Markus, Waschk, Thomas, Brueckel, and Subhankar, Bedanta

Abstract

Manganites have shown potential in spintronics because they exhibit high spin polarization. Here, by ferromagnetic resonance we have studied the damping properties of La0.67Sr0.33MnO3/Pt bilayers which are prepared by oxide molecular beam epitaxy. The damping coefficient (α) of a La0.67Sr0.33MnO3 (LSMO) single layer is found to be 0.0104. However the LSMO/Pt bilayers exhibit a decrease in α with an increase in Pt thickness. This decrease in the value of α is probably due to high anti-damping like torque. Furthermore, we have investigated the angle dependent inverse spin Hall effect (ISHE) to quantify the spin pumping voltage from other spin rectification effects such as the anomalous Hall effect and anisotropic magnetoresistance. We have observed a high spin pumping voltage (∼20 μV). The results indicate that both anti-damping and spin pumping phenomena occur simultaneously.

Published
2021

4. Impact of growth kinetics on the interface morphology and magnetization in La 1/3 Sr 2/3 FeO 3 /La 2/3 Sr 1/3 MnO 3 heterostructures

Author

Th. Brückel, Anirban Sarkar, Markus Schmitz, Jörg Voigt, Markus Waschk, J. Schubert, B J Kirby, Juri Barthel, Sabine Pütter, Sonja Schröder, and Paul Zakalek

Subjects
Materials science, Magnetic structure, Condensed matter physics, Heterojunction, 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Magnetization, Surface coating, Exchange bias, Ferromagnetism, 0103 physical sciences, General Materials Science, ddc:530, Thin film, 010306 general physics, 0210 nano-technology, Perovskite (structure)
Abstract

Journal of physics / Condensed matter Condensed matter 32(16), 165801 - (2020). doi:10.1088/1361-648X/ab678c, Published by IOP Publ., Bristol

Published
2020
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5. Poster: Advances in Technology and Characterization

Author

Alexander Weber, M. Reiners, Mikko Ritala, See‐Hun Yang, Thomas Schäpers, Y. Yamashita, C. H. Chen, C. M. Schneider, S. Ueda, Larissa Juschkin, Igor Nemeth, Sergey Seriy, Kilian Flöhr, H. D. Yang, L. Juschkin, M. Leskelä, Rainer Jany, Alexander X. Gray, H. Boschker, Claus M. Schneider, R. Muenstermann, Susanne Hoffmann-Eifert, I. Krug, Markku Leskelä, Dieter Weber, W. Drube, U. Klemradt, Alexander Kaiser, J. Niinistö, C.S Fadley, J. Perlich, M. H. Lee, H. Mähne, Regina Dittmann, Anke Aretz, Jochen Mannhart, Meiken Falke, Jan Minár, Manfred Martin, Lukasz Plucinski, H. Kim, Irina Kärkkänen, F. Pfaff, Jürgen Braun, L. Plucinski, Jaakko Niinistö, S. Stille, H. Yusuf Günel, A. X. Gray, S. Hoffmann‐Eifert, M.‐W. Chu, A. Köhl, Guus Rijnders, K. Sladek, Eli Rotenberg, Ch. Lenser, Markus Morgenstern, Mark Huijben, M. Sing, H. Ebert, T. Blanquart, David H.A. Blank, T. Mikolajick, Alexandra Steffen, G. Berner, R. Waser, Aleksey Maryasov, Stefan Mattauch, P. Loosen, Charles S. Fadley, Stefan Herbert, Tobias Salge, Jun-ichiro Kishine, Aaron Bostwick, Tassilo Heeg, Tadachika Nakayama, Yoshihiko Togawa, A. Müller, Róza Võfély, Haifeng Li, Mikko Heikkilä, Thomas Brückel, K. Kobayashi, Sabine Pütter, Gertjan Koster, J. Braun, Markus Waschk, N. Aslam, Slavomír Nemšák, Rainer Lebert, Rainer Waser, K. Bergmann, Carsten Woltmann, Yuehua Chen, Igor Proskurin, Koichi Niihara, Hans Boschker, W. Stein, Milias Crumbach, G. Conti, Dave H. A. Blank, Marcus Liebmann, Robert Frielinghaus, S. Danylyuk, R. Claessen, Ulrich Poppe, Susanne Stemmer, Hilde Hardtdegen, A. S. Ovchinnikov, S. Thiess, Roman Nowak, Christoph Richter, J. Minar, Juergen Braun, and Hubert Ebert

Subjects
Materials science, Reflection high-energy electron diffraction, Electron diffraction, 0103 physical sciences, Nanotechnology, 02 engineering and technology, 021001 nanoscience & nanotechnology, 010306 general physics, 0210 nano-technology, 01 natural sciences, Characterization (materials science)
Published
2013
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