Zobrazeno 1 - 10
of 330
pro vyhledávání: '"Hrkac G."'
Autor:
Kirk, E., Bull, C., Finizio, S., Sepehri-Amin, H., Wintz, S., Suszka, A. K., Bingham, N. S., Warnicke, P., Hono, K., Nutter, P. W., Raabe, J., Hrkac, G., Thomson, T., Heyderman, L. J.
The ability to tune the competition between the in-plane and out-of-plane orientation of magnetization provides a means to construct thermal sensors with a sharp spin re-orientation transition at specific temperatures. We have observed such a tuneabl
Externí odkaz:
http://arxiv.org/abs/2007.03657
Autor:
Bance S., Gusenbauer M., Praetorius D., Hrkac G., Suess D., Schrefl T., Reichel F., Oezelt H., Fischbacher J., Exl L.
Publikováno v:
EPJ Web of Conferences, Vol 40, p 13004 (2013)
By application of a magnetic field on an amorphous metallic strip, the orientation of magnetization of Weiss domains can be changed. When the strip changes its length, this effect is called magnetostriction. We simulate this effect using a finite e
Externí odkaz:
https://doaj.org/article/998b1a9f4615417da65eef1c4f28817a
Autor:
Fischbacher, J., Kovacs, A., Oezelt, H., Gusenbauer, M., Schrefl, T., Exl, L., Givord, D., Dempsey, N. M., Zimanyi, G., Winklhofer, M., Hrkac, G., Chantrell, R., Sakuma, N., Yano, M., Kato, A., Shoji, T., Manabe, A.
Publikováno v:
Appl. Phys. Lett. 111, 072404 (2017)
The maximum coercivity that can be achieved for a given hard magnetic alloy is estimated by computing the energy barrier for the nucleation of a reversed domain in an idealized microstructure without any structural defects and without any soft magnet
Externí odkaz:
http://arxiv.org/abs/1708.01880
Autor:
Mushenok, F. B., Dost, R., Davies, C. S., Allwood, D. A., Inkson, B. J., Hrkac, G., Kruglyak, V. V.
Publikováno v:
Appl. Phys. Lett. 111, 042404 (2017)
We have used time-resolved scanning Kerr microscopy (TRSKM) and micromagnetic simulations to demonstrate that, when driven by spatially uniform microwave field, the edges of patterned magnetic samples represent both efficient and highly tunable sourc
Externí odkaz:
http://arxiv.org/abs/1706.04409
Autor:
Keatley, P. S., Sani, S. R., Hrkac, G., Mohseni, S. M., Dürrenfeld, P., Åkerman, J., Hicken, R. J.
Publikováno v:
Phys. Rev. B 94, 094404 (2016)
Super-harmonic injection locking of single nano-contact (NC) spin-torque vortex oscillators (STVOs) subject to a small microwave current has been explored. Frequency locking was observed up to the fourth harmonic of the STVO fundamental frequency $f_
Externí odkaz:
http://arxiv.org/abs/1604.04462
Autor:
Keatley, P. S., Sani, S. R., Hrkac, G., Mohseni, S. M., Dürrenfeld, P., Loughran, T. H. J., Åkerman, J., Hicken, R. J.
Publikováno v:
Phys. Rev. B 94, 060402 (2016)
Time-resolved scanning Kerr microscopy has been used to directly image the magnetization dynamics of nano-contact (NC) spin-torque vortex oscillators (STVOs) when phase-locked to an injected microwave (RF) current. The Kerr images reveal free layer m
Externí odkaz:
http://arxiv.org/abs/1604.04455
Autor:
Bance, S., Ciuta, G., Shoji, T., Gao, T., Hrkac, G., Yano, M., Manabe, A., Dempsey, N. M., Schrefl, T., Givord, D.
Publikováno v:
Proceedings of the 23rd International Workshop on Rare earth and Future Permanent Magnets and Their Appications (REPM2014), Annapolis, Maryland, August 2014
Based on a critical analysis of the experimental coercive properties, general considerations on the reversal mechanisms in RFeB magnets are recalled. By plotting together the experimental parameters obtained in various magnets, common features of the
Externí odkaz:
http://arxiv.org/abs/1502.02491
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 low-field dynamics of current-driven vortex oscillations in nanocontacts based on spin-valve multilayers. These oscillations appear as low-frequency (250-500 MHz) excitations in the electrical p
Externí odkaz:
http://arxiv.org/abs/0906.0878
Autor:
Cornelissen, S., Bianchini, L., Hrkac, G., de Beeck, M. Op, Lagae, L., Kim, Joo-Von, Devolder, T., Crozat, P., Chappert, C., Schrefl, T.
Publikováno v:
Europhys. Lett. 87, 57001 (2009)
We present an experimental study of the power spectrum of current-driven magnetization oscillations in MgO tunnel junctions under low bias. We find the existence of narrow spectral lines, down to 8 MHz in width at a frequency of 10.7 GHz, for small a
Externí odkaz:
http://arxiv.org/abs/0810.1110