Fast Vortex Core Switching at Moderate Temperatures

• Authors: K. Lebecki , U. Nowak
• Languages of publication: EN

Abstracts

EN

Ferromagnetic vortex core switching is investigated using micromagnetic simulations. For that the OOMMF program is used together with a temperature extension we have developed recently. This is a continuum micromagnetic approach, where the well-known Landau-Lifshitz-Gilbert equation (valid for zero temperature) is replaced by the Landau-Lifshitz-Bloch equation. In our research we simulate switching of a ferromagnetic vortex core in a flat disk (diameter 200 nm, thickness 20 nm) with material parameters that resemble permalloy. Temperatures in the range 400 K to 700 K are considered. Switching itself is caused by application of a very short oscillating magnetic pulse. Parameters used resemble conditions met in the experiment: oscillation period 141 ps (equal to the peak width) and amplitude 60 mT. Surprisingly, no large temperature- or discretization dependence is found. Reasons for that are discussed.

Keywords

EN

75.30.Ds; 75.60.Nt; 75.78.-n; 75.78.Cd

Discipline

• 75.30.Ds: Spin waves(for spin-wave resonance, see 76.50.+g)
• 75.60.Nt: Magnetic annealing and temperature-hysteresis effects
• 75.78.Cd: Micromagnetic simulations
• 75.78.-n: Magnetization dynamics

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2015
• Volume: 127
• Issue: 2
• Pages: 342-344

Dates

published

2015-02

Contributors

author

K. Lebecki

• Nanotechnology Centre, VSB-Technical University of Ostrava, 17. listopadu 15, CZ-708 33 Ostrava, Czech Republic

author

U. Nowak

• Department of Physics, University of Konstanz, D-78457 Konstanz, Germany

References

• [1] A. Wachowiak, J. Wiebe, M. Bode, O. Pietzsch, M. Morgenstern, R. Wiesendanger, Science 298, 577 (2002), doi: 10.1126/science.1075302
• [2] K. Nakano, D. Chiba, N. Ohshima, S. Kasai, T. Sato, Y. Nakatani, K. Sekiguchi, K. Kobayashi, T. Ono, Appl. Phys. Lett. 99, 262505 (2011), doi: 10.1063/1.3673303
• [3] Q. Mistral, M. van Kampen, G. Hrkac, J.-V. Kim, T. Devolder, P. Crozat, C. Chappert, L. Lagae, T. Schrefl, Phys. Rev. Lett. 100, 257201 (2008), doi: 10.1103/PhysRevLett.100.257201
• [4] A. Thiaville, J.M. Garcia, R. Dittrich, J. Miltat, T. Schrefl, Phys. Rev. B 67, 094410 (2003), doi: 10.1103/PhysRevB.67.094410
• [5] K.M. Lebecki, U. Nowak, Phys. Rev. B 89, 014421 (2014), doi: 10.1103/PhysRevB.89.014421
• [6] R. Hertel, S. Gliga, M. Faehnle, C.M. Schneider, Phys. Rev. Lett. 98, 117201 (2007), doi: 10.1103/PhysRevLett.98.117201
• [7] Y. Liu, S. Gliga, R. Hertel, C. Schneider, Appl. Phys. Lett. 91, 112501 (2007), doi: 10.1063/1.2780107
• [8] B. Van Waeyenberge, A. Puzic, H. Stoll, K.W. Chou, T. Tyliszczak, R. Hertel, M. Fahnle, H. Bruckl, K. Rott, G. Reiss, I. Neudecker, D. Weiss, C.H. Back, G. Schuetz, Nature 444, 461 (2006), doi: 10.1038/nature05240
• [9] M. Kammerer, M. Weigand, M. Curcic, M. Noske, M. Sproll, A. Vansteenkiste, B. Van Waeyenberge, H. Stoll, G. Woltersdorf, C.H. Back, G. Schuetz, Nat. Commun. 2, 279 (2011), doi: 10.1038/ncomms1277
• [10] M. Kammerer, H. Stoll, M. Noske, M. Sproll, M. Weigand, C. Illg, G. Woltersdorf, M. Fähnle, C. Back, G. Schütz, Phys. Rev. B 86, 134426 (2012), doi: 10.1103/PhysRevB.86.134426
• [11] K.M. Lebecki, D. Hinzke, U. Nowak, O. Chubykalo-Fesenko, Phys. Rev. B 86, 094409 (2012), doi: 10.1103/PhysRevB.86.094409
• [12] D.A. Garanin, Phys. Rev. B 55, 3050 (1997), doi: 10.1103/PhysRevB.55.3050
• [13] K.M. Lebecki, U. Nowak, J. Appl. Phys. 113, 023906 (2013), doi: 10.1063/1.4774411
• [14] Applied field was constructed from a sinusoid multiplied by a Lorentzian with the full width at half maximum (FWHM) equal to one period
• [15] C. Andreas, S. Gliga, R. Hertel, J. Magn. Magn. Mater. 362, 7 (2014), doi: 10.1016/j.jmmm.2014.02.097
• [16] R. Hertel, J. Kirschner, J. Magn. Magn. Mater. 278, L291 (2004), doi: 10.1016/j.jmmm.2004.02.032

Identifiers

DOI

10.12693/APhysPolA.127.342