Zobrazeno 1 - 10
of 467
pro vyhledávání: '"Spemann D"'
Autor:
Lorite, I., Zandalazini, C., Esquinazi, P., Spemann, D., Friedländer, S., Pöppl, A., Michalsky, T., Grundmann, M., Vogt, J., Meijer, J., Heluani, S. P., Ohldag, H., Adeagbo, W. A., Nayak, S. K., Hergert, W., Ernst, A., Hoffmann, M.
The magneto-transport properties of single proton-implanted ZnO and of Li(7\%)-doped ZnO microwires have been studied. The as-grown microwires were highly insulating and not magnetic. After proton implantation the Li(7\%) doped ZnO microwires showed
Externí odkaz:
http://arxiv.org/abs/1504.08230
The magnetotransport properties were studied in hundreds of micrometer length double-wall carbon nanotubes (DWCNT) bundles. Above 15 K the resistance shows an ohmic behavior and its temperature dependence is well described using the variable-range ho
Externí odkaz:
http://arxiv.org/abs/1503.00579
We present a new method to obtain topological insulator Bi$_2$Se$_3$ thin films with a centimeter large lateral length. To produce amorphous Bi$_2$Se$_3$ thin films we have used a sequential flash-evaporation method at room temperature. Transmission
Externí odkaz:
http://arxiv.org/abs/1502.01135
In this study, the impurity concentration and magnetic response of nine highly oriented pyrolytic graphite (HOPG) samples with different grades and from different providers were determined using ion beam microscopy and SQUID magnetometry. Apart from
Externí odkaz:
http://arxiv.org/abs/1310.3056
Publikováno v:
Magnetics, IEEE Transactions on, Volume:49, pages: 4668 - 4674 (2013)
In the last years the number of nominally non-magnetic solids showing magnetic order induced by some kind of defects has increased continuously. From the single element material graphite to several covalently bonded non-magnetic compounds, the influe
Externí odkaz:
http://arxiv.org/abs/1304.0137
Publikováno v:
EPL 98 (2012) 57006
This comment addresses several issues in the paper by Sepioni et al., where it is stated that the ferromagnetism in pristine highly oriented pyrolytic graphite (HOPG) reported by several groups in the previous years is most likely due to impurity con
Externí odkaz:
http://arxiv.org/abs/1204.2992
Publikováno v:
Phys. Rev. B 85, 134424 (2012)
We investigated the magnetic properties of hydrogen plasma treated ZnO single crystals by SQUID magnetometry. In agreement with the expected hydrogen penetration depth we found ferromagnetic behavior located at the first 20 nm of the H-treated surfac
Externí odkaz:
http://arxiv.org/abs/1104.1899
We present a x-ray dichroism study of graphite surfaces that addresses the origin and magnitude of ferromagnetism in metal-free carbon. We find that, in addition to carbon $\pi$ states, also hydrogen-mediated electronic states exhibit a net spin pola
Externí odkaz:
http://arxiv.org/abs/0905.4315
Autor:
Esquinazi, P., Barzola-Quiquia, J., Spemann, D., Rothermel, M., Ohldag, H., García, N., Setzer, A., Butz, T.
We discuss recently obtained data using different experimental methods including magnetoresistance measurements that indicate the existence of metal-free high-temperature magnetic order in graphite. Intrinsic as well as extrinsic difficulties to trig
Externí odkaz:
http://arxiv.org/abs/0902.1671
We have prepared magnetic graphite samples bombarded by protons at low temperatures and low fluences to attenuate the large thermal annealing produced during irradiation. An overall optimization of sample handling allowed us to find Curie temperature
Externí odkaz:
http://arxiv.org/abs/0706.2442