Temperature effect on vortex-core reversals in magnetic nanodots
作者： Bosung Kim , Myoung-Woo Yoo , Jehyun Lee , Sang-Koog Kim
DOI: 10.1063/1.4919836
关键词:
摘要: We studied the temperature effect on vortex-core reversals in soft magnetic nanodots by micromagnetic numerical calculations within a framework of stochastic Landau-Lifshitz-Gilbert scheme. It was determined that vortex-core-switching events at non-zero temperatures occur stochastically, and threshold field strength increases with for given frequency. The mechanism core elevated is same as vortex-antivortex-pair-mediated found zero temperature. reversal criterion also out-of-plane component magnetization dip should reach −p, which to say, mz,dip = −p, where p original polarization, p = +1 (−1), upward (downward) core. By this criterion, creation vortex-antivortex pair accompanies complete vortex-antivortex-annihilation-mediated reversals, resulting maximum excess exchange energy density, ΔEexcri ≈ 15.4 ± 0.2 mJ/cm3. This work provides underl...
harvard.edu
scitation.org
aip.org
sci-hub.se 参考文章(40)
G. M. Wysin, W. Figueiredo, Thermal vortex dynamics in thin circular ferromagnetic nanodisks Physical Review B. ,vol. 86, pp. 104421- ,(2012) , 10.1103/PHYSREVB.86.104421
Kristof M. Lebecki, Ulrich Nowak, Ferromagnetic vortex core switching at elevated temperatures Physical Review B. ,vol. 89, pp. 014421- ,(2014) , 10.1103/PHYSREVB.89.014421
J. C. Sankey, I. N. Krivorotov, S. I. Kiselev, P. M. Braganca, N. C. Emley, R. A. Buhrman, D. C. Ralph, Mechanisms limiting the coherence time of spontaneous magnetic oscillations driven by dc spin-polarized currents Physical Review B. ,vol. 72, pp. 224427- ,(2005) , 10.1103/PHYSREVB.72.224427
V. Novosad, M. Grimsditch, K. Yu. Guslienko, P. Vavassori, Y. Otani, S. D. Bader, Spin excitations of magnetic vortices in ferromagnetic nanodots Physical Review B. ,vol. 66, pp. 052407- ,(2002) , 10.1103/PHYSREVB.66.052407
Matthias Noske, Ajay Gangwar, Hermann Stoll, Matthias Kammerer, Markus Sproll, Georg Dieterle, Markus Weigand, Manfred Fähnle, Georg Woltersdorf, Christian H. Back, Gisela Schütz, Unidirectional sub-100-ps magnetic vortex core reversal Physical Review B. ,vol. 90, pp. 104415- ,(2014) , 10.1103/PHYSREVB.90.104415
Riccardo Hertel, Claus M. Schneider, Exchange explosions: Magnetization dynamics during vortex-antivortex annihilation. Physical Review Letters. ,vol. 97, pp. 177202- 177202 ,(2006) , 10.1103/PHYSREVLETT.97.177202
Ruifang Wang, Xinwei Dong, Sub-nanosecond switching of vortex cores using a resonant perpendicular magnetic field Applied Physics Letters. ,vol. 100, pp. 082402- ,(2012) , 10.1063/1.3687909
Sang-Koog Kim, Youn-Seok Choi, Ki-Suk Lee, Konstantin Y. Guslienko, Dae-Eun Jeong, Electric-current-driven vortex-core reversal in soft magnetic nanodots Applied Physics Letters. ,vol. 91, pp. 082506- ,(2007) , 10.1063/1.2773748
Ki-Suk Lee, Sang-Koog Kim, Young-Sang Yu, Youn-Seok Choi, Konstantin Yu. Guslienko, Hyunsung Jung, Peter Fischer, Universal criterion and phase diagram for switching a magnetic vortex core in soft magnetic nanodots. Physical Review Letters. ,vol. 101, pp. 267206- 267206 ,(2008) , 10.1103/PHYSREVLETT.101.267206
H.T. Hardner, M.J. Hurben, N. Tabat, Noise and magnetic domain fluctuations in spin-valve GMR heads ieee international magnetics conference. ,vol. 35, pp. 2592- 2594 ,(1999) , 10.1109/20.800900