Analytical investigation of spin-transfer dynamics using a perpendicular-to-plane polarizer

Lee, K. J.; Redon, O.; Dieny, B.
January 2005
Applied Physics Letters;1/10/2005, Vol. 86 Issue 2, p022505
Academic Journal
We studied current-induced magnetic switching and excitations in structures comprising a free layer with in-plane magnetization traversed by a current with perpendicular-to-plane spin polarization. We derived analytical solutions from the Landau–Lifshitz–Gilbert equation including the spin-torque term, and compared them to numerical simulations within the single domain assumption. Taking into account the criterion of thermal stability, the magnetization switching in nanostructures of typical size below 100 nm comprising a perpendicular polarizer is found to require larger current density but to be much faster than with a longitudinal polarizer. Furthermore, a steady precession of magnetization can be generated in this geometry; those frequencies can be tuned from about 1 to 20 GHz by only changing the current without applying any external field. This opens a promising application as microwave sources.


Related Articles

  • Magnetic-field-controlled noise-activated switching in a nonlinear three-terminal nanojunction. Hartmann, F.; Hartmann, D.; Kowalzik, P.; Gammaitoni, L.; Forchel, A.; Worschech, L. // Applied Physics Letters;Feb2010, Vol. 96 Issue 8, p082108 

    Magnetic-field-controlled switching of a nonlinear three-terminal nanojunction was studied. Noise-activated switching was observed, which depends sensitively on the strength of an external magnetic field. Such a functioning resembles a noise-activated nonlinear detector as proposed by Gammaitoni...

  • Effect of bias on indirect exchange within magnetic nanostructures. Kozub, V. I.; Vinokur, V. // Applied Physics Letters;8/8/2005, Vol. 87 Issue 6, p062507 

    We formulate a theory of a reversible switching of the magnetic state of magnetic multilayers embedded in the metallic nanoconstriction by the external bias. The switching is related to the effect of strongly nonequilibrium electron distribution existing in the biased nanoconstriction on the...

  • Electric-current-driven vortex-core reversal in soft magnetic nanodots. Kim, Sang-Koog; Choi, Youn-Seok; Lee, Ki-Suk; Guslienko, Konstantin Y.; Jeong, Dae-Eun // Applied Physics Letters;8/20/2007, Vol. 91 Issue 8, p082506 

    The authors report on electric-current-driven vortex-core (VC) reversal (switching) and the accompanying spin-wave emission, driven by spin-polarized ac currents of different amplitudes and frequencies, investigated by micromagnetic calculations of the dynamic evolution of a magnetic vortex in...

  • Diagnostics of a Weak Magnetic Field upon Pulse Excitation of an Ensemble of Particles. Kantsyrev, V. L.; Petrashen�, A. G.; Shlyaptseva, A. S. // Optics & Spectroscopy;Mar2003, Vol. 94 Issue 3, p338 

    A method of diagnostics of weak magnetic fields, based on the spectropolarimetry of damped radiation from an ensemble of particles excited by a rectangular pulse, is suggested. This method can be used without any assumptions about the dynamics of excitation. � 2003 MAIK �Nauka /...

  • Spin transfer switching enhancement in perpendicular anisotropy magnetic tunnel junctions with a canted in-plane spin polarizer. Sbiaa, Rachid; Law, Randall; Tan, Ei-Leen; Liew, Thomas // Journal of Applied Physics;Jan2009, Vol. 105 Issue 1, p013910 

    We have studied spin transfer switching (STS) in a magnetic tunnel junction with perpendicular magnetic anisotropy for the reference and free layers using the Landau–Lifshitz–Gilbert formalism. We propose a multilayer structure in which the insertion of an additional spin polarizer...

  • Multistable switching due to magnetic vortices pinned at artificial pinning sites. Rahm, M.; Stahl, J.; Wegscheider, W.; Weiss, D. // Applied Physics Letters;8/30/2004, Vol. 85 Issue 9, p1553 

    Magnetic vortices form the ground state in micron and submicron ferromagnetic disks. By inserting artificial defects (antidots) into a submicron ferromagnetic disk, magnetic vortices can be pinned controllably thus enabling a different way for magnetic switching. We show that by inserting n...

  • Switching of saturation magnetization by carrier injection in YBa2Cu3O7-δ/α-Fe2O3/Nb-SrTiO3 junctions. Yuansha Chen; Guijun Lian; Guangcheng Xiong; Venkatesan, T. // Applied Physics Letters;6/6/2011, Vol. 98 Issue 23, p232513 

    Ferromagnetic (FM) α-Fe2O3 layers were deposited on n-type oxide semiconductor substrates of Nb-doped SrTiO3 (NSTO) to form YBa2Cu3O7-δ/α-Fe2O3/NSTO junctions. Multilevel resistance switching behavior was observed in YBa2Cu3O7-δ/α-Fe2O3/NSTO junctions with stable resistive states....

  • Distribution of switching field fluctuations in Fe-rich wires under tensile stress. Gawronski, P.; Zhukov, A.; Zhukova, V.; González, J.; Blanco, J. M.; Kulakowski, K. // Applied Physics Letters;4/10/2006, Vol. 88 Issue 15, p152507 

    We present experimental results on the influence of the applied tensile stress on switching-field distribution in as-cast Fe-rich amorphous wires. The fluctuation spectrum of the switching field reveals two different mechanisms, namely (i) magnetoelastic coupling of the domain wall with internal...

  • Demonstration of multilevel cell spin transfer switching in MgO magnetic tunnel junctions. Xiaohua Lou; Zheng Gao; Dimitrov, Dimitar V.; Tang, Michael X. // Applied Physics Letters;12/15/2008, Vol. 93 Issue 24, p242502 

    Multilevel cell is an important concept to improve the density of spin transfer torque memory. We demonstrated two-bit multilevel cell spin transfer switching using MgO-based magnetic tunnel junctions. Two types of cell structural design are discussed. Multiple resistance levels are depicted in...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics