Zobrazeno 1 - 10
of 453
pro vyhledávání: '"van Roy, W."'
Vortex-based spin-torque oscillators can be made from extended spin valves connected to an electrical nanocontact. We study the implementation of frequency shift keying modulation in these oscillators. Upon a square modulation of the current in the 1
Externí odkaz:
http://arxiv.org/abs/1010.4464
Autor:
Bianchini, L., Cornelissen, S., Kim, Joo-Von, Devolder, T., van Roy, W., Lagae, L., Chappert, C.
Publikováno v:
Appl. Phys. Lett. 97, 032502 (2010)
We study spin-torque induced oscillations of MgO magnetic tunnel junctions in the time domain. By using the Hilbert transform on the time traces, we obtain for the first time a direct experimental measure of the coupling between the power and the pha
Externí odkaz:
http://arxiv.org/abs/1004.5319
Autor:
Manfrini, M., Devolder, T., Kim, Joo-Von, Crozat, P., Zerounian, N., Chappert, C., Van Roy, W., Lagae, L., Hrkac, G., Schrefl, T.
We study the agility of current-tunable oscillators based on a magnetic vortex orbiting around a point contact in spin-valves. Theory predicts frequency-tuning by currents occurs at constant orbital radius, so an exceptional agility is anticipated. T
Externí odkaz:
http://arxiv.org/abs/0910.1941
We present an experimental and theoretical study of the magnetic field dependence of the mode frequency of thermally excited spin waves in rectangular shaped nanopillars of lateral sizes 60x100, 75x150, and 105x190 nm2, patterned from MgO-based magne
Externí odkaz:
http://arxiv.org/abs/0907.3792
Autor:
Gould, C., Mark, S., Pappert, K., Dengel, G., Wenisch, J., Campion, R. P., Rushforth, A. W., Chiba, D., Li, Z., Liu, X., Van Roy, W., Ohno, H., Furdyna, J. K., Gallagher, B., Brunner, K., Schmidt, G., Molenkamp, L. W.
This paper reports on a detailed magnetotransport investigation of the magnetic anisotropies of (Ga,Mn)As layers produced by various sources worldwide. Using anisotropy fingerprints to identify contributions of the various higher order anisotropy ter
Externí odkaz:
http://arxiv.org/abs/0802.4206
Autor:
Yakunin, A. M., Silov, A. Yu., Koenraad, P. M., Tang, J. -M., Flatté, M. E., Van Roy, W., De Boeck, J., Wolter, J. H.
The local density of states of Mn-Mn pairs in GaAs is mapped with cross-sectional scanning tunneling microscopy and compared with theoretical calculations based on envelope-function and tight-binding models. These measurements and calculations show t
Externí odkaz:
http://arxiv.org/abs/cond-mat/0505536
Autor:
Masmanidis, S. C., Tang, H. X., Myers, E. B., Li, Mo, De Greve, K., Vermeulen, G., Van Roy, W., Roukes, M. L.
A (Ga,Mn)As nanoelectromechanical resonator is used to obtain the first direct measurement of magnetostriction in a dilute magnetic semiconductor. Field-dependent magnetoelastic stress induces shifts in resonance frequency that can be discerned with
Externí odkaz:
http://arxiv.org/abs/cond-mat/0505222
Autor:
Van Dorpe, P., Van Roy, W., De Boeck, J., Borghs, G., Sankowski, P., Kacman, P., Majewski, J. A., Dietl, T.
The spin polarization of the electron current in a p-(Ga,Mn)As-n-(Al,Ga)As-Zener tunnel diode, which is embedded in a light-emitting diode, has been studied theoretically. A series of self-consistent simulations determines the charge distribution, th
Externí odkaz:
http://arxiv.org/abs/cond-mat/0502615
Autor:
Goennenwein, S. T. B., Russo, S., Morpurgo, A. F., Klapwijk, T. M., van Roy, W., de Boeck, J.
We have performed a systematic investigation of the longitudinal and transverse magnetoresistance of a single ferromagnetic domain in (Ga,Mn)As. We find that, by taking into account the intrinsic dependence of the resistivity on the magnetic inductio
Externí odkaz:
http://arxiv.org/abs/cond-mat/0412290
Publikováno v:
Appl. Phys. Lett. 86 (13), 132501 (2005)
We report on in-situ resistivity measurements on GaMnAs during post-growth annealing in different atmospheres. A drop in the resistivity is observed when the GaMnAs is exposed to oxygen, which indicates that the passivation of Mn interstitials (Mn_I)
Externí odkaz:
http://arxiv.org/abs/cond-mat/0409720