Zobrazeno 1 - 10
of 188
pro vyhledávání: '"Böttger, Roman"'
Autor:
Yıldırım, Oğuz, Hilliard, Donovan, Arekapudi, Sri Sai Phani Kanth, Fowley, Ciarán, Cansever, Hamza, Koch, Leopold, Ramasubramanian, Lakshmi, Zhou, Shengqiang, Böttger, Roman, Lindner, Jürgen, Faßbender, Jürgen, Hellwig, Olav, Deac, Alina M.
Publikováno v:
ACS Applied Materials and Interfaces (2020)
Interfaces separating ferromagnetic (FM) layers from non-ferromagnetic layers offer unique properties due to spin-orbit coupling and symmetry breaking, yielding effects such as exchange bias, perpendicular magnetic anisotropy, spin-pumping, spin-tran
Externí odkaz:
http://arxiv.org/abs/2002.08090
Autor:
Ehrler, Jonathan, Sanyal, Biplab, Grenzer, Jörg, Zhou, Shengqiang, Böttger, Roman, Eggert, Benedikt, Wende, Heiko, Lindner, Jürgen, Fassbender, Jürgen, Leyens, Christoph, Potzger, Kay, Bali, Rantej
Publikováno v:
New Journal of Physics (2020)
Ferromagnetism in certain B2 ordered alloys such as Fe$_{60}$Al$_{40}$ can be switched on, and tuned, via antisite disordering of the atomic arrangement. The disordering is accompanied by a $\sim$1 % increase in the lattice parameter. Here we perform
Externí odkaz:
http://arxiv.org/abs/1911.08404
Autor:
Wang, Changan, Chen, Chao, Chang, Ching-Hao, Tsai, Hsu-Sheng, Pandey, Parul, Xu, Chi, Böttger, Roman, Chen, Deyang, Zeng, Yu-Jia, Gao, Xingsen, Helm, Manfred, Zhou, Shengqiang
Publikováno v:
ACS Appl. Mater. Interfaces, 10, 27472 (2018)
Exchange bias stems from the interaction between different magnetic phases and therefore it generally occurs in magnetic multilayers. Here we present a large exchange bias in a single SrRuO3 layer induced by helium ion irradiation. When the fluence i
Externí odkaz:
http://arxiv.org/abs/1809.11035
Autor:
Yuan, Ye, Hübner, René, Birowska, Magdalena, Xu, Chi, Wang, Mao, Prucnal, Slawomir, Jakiela, Rafal, Potzger, Kay, Böttger, Roman, Facsko, Stefan, Majewski, Jacek A., Helm, Manfred, Sawicki, Maciej, Zhou, Shengqiang, Dietl, Tomasz
Publikováno v:
Phys. Rev. Materials 2, 114601 (2018)
The origin of nematicity, i.e., in-plane rotational symmetry breaking, and in particular the relative role played by spontaneous unidirectional ordering of spin, orbital, or charge degrees of freedom, is a challenging issue of magnetism, unconvention
Externí odkaz:
http://arxiv.org/abs/1807.05966
Autor:
Wang, Changan, Chang, Ching-Hao, Huang, Angus, Wang, Pei-Chun, Wu, Ping-Chun, Yang, Lin, Xu, Chi, Pandey, Parul, Zeng, Min, Böttger, Roman, Jeng, Horng-Tay, Zeng, Yu-Jia, Helm, Manfred, Chu, Ying-Hao, Ganesh, R., Zhou, Shengqiang
Publikováno v:
Phys. Rev. Materials 3, 053801 (2019)
The rare-earth nickelates are a rich playground for transport properties, known to host non-Fermi liquid character, resistance saturation and metal-insulator transitions. We report a study of transport in LaNiO3 in the presence of tunable disorder in
Externí odkaz:
http://arxiv.org/abs/1806.07986
Autor:
Berencén, Yonder, Prucnal, Slawomir, Möller, Wolfhard, Hübner, René, Rebohle, Lars, Böttger, Roman, Glaser, Markus, Schönherr, Tommy, Yuan, Ye, Wang, Mao, Georgiev, Yordan M., Erbe, Artur, Lugstein, Alois, Helm, Manfred, Zhou, Shengqiang, Skorupa, Wolfgang
Hyperdoping consists of the intentional introduction of deep-level dopants into a semiconductor in excess of equilibrium concentrations. This causes a broadening of dopant energy levels into an intermediate band between the valence and conduction ban
Externí odkaz:
http://arxiv.org/abs/1802.07099
Autor:
Yuan, Ye, Wang, Mao, Xu, Chi, Hübner, René, Böttger, Roman, Jakiela, Rafal, Helm, Manfred, Sawicki, Maciej, Zhou, Shengqiang
Publikováno v:
J. Phys.: Condens. Matter 30 095801 (2018)
In the present work, low compensated insulating (Ga,Mn)As with 0.7% Mn is obtained by ion implantation combined with pulsed laser melting. The sample shows variable-range hopping transport behavior with a Coulomb gap in the vicinity of the Fermi ener
Externí odkaz:
http://arxiv.org/abs/1802.07056
Autor:
Tripathi, Mukesh, Markevich, Alexander, Böttger, Roman, Facsko, Stefan, Besley, Elena, Kotakoski, Jani, Susi, Toma
Publikováno v:
ACS Nano 12, 4641-4647 (2018)
Incorporating heteroatoms into the graphene lattice may be used to tailor its electronic, mechanical and chemical properties. Direct substitutions have thus far been limited to incidental Si impurities and P, N and B dopants introduced using low-ener
Externí odkaz:
http://arxiv.org/abs/1802.04660
Autor:
Wendler, Florian, Mittendorff, Martin, König-Otto, Jacob C., Brem, Samuel, Berger, Claire, de Heer, Walter A., Böttger, Roman, Schneider, Harald, Helm, Manfred, Winnerl, Stephan, Malic, Ermin
Publikováno v:
Wendler, Florian, et al. "Symmetry-Breaking Supercollisions in Landau-Quantized Graphene." Physical review letters 119.6 (2017): 067405
Recent pump-probe experiments performed on graphene in a perpendicular magnetic field have revealed carrier relaxation times ranging from picoseconds to nanoseconds depending on the quality of the sample. To explain this surprising behavior, we propo
Externí odkaz:
http://arxiv.org/abs/1801.08463
Autor:
Yuan, Ye, Xu, Chi, Hübner, René, Jakiela, Rafal, Böttger, Roman, Helm, Manfred, Sawicki, Maciej, Dietl, Tomasz, Zhou, Shengqiang
Publikováno v:
Phys. Rev. Mater 1, 054401 (2017)
Ion implantation of Mn combined with pulsed laser melting is employed to obtain two representative compounds of dilute ferromagnetic semiconductors (DFSs): Ga1-xMnxAs and In1-xMnxAs. In contrast to films deposited by the widely used molecular beam ep
Externí odkaz:
http://arxiv.org/abs/1709.05043