Tunable field imbalance and spin precession in magnetic double layers

Au, Y.; Sooryakumar, R.; Bussmann, K.
November 2004
Applied Physics Letters;11/15/2004, Vol. 85 Issue 20, p4675
Academic Journal
We report on the manipulation of spin-wave mode profiles by a field imbalance in magnetic double layers produced by the combination of an external field (Hext) and an in-plane spacer layer current-induced Amperian field (Hcur). The magnetizations between layers are tuned from antiparallel to parallel alignment and the associated oscillation amplitudes monitored by Brillouin light scattering. While the results are well accounted for by Maxwell and Landau-Lifshitz equations, a mechanical coupled pendulum analog in a variable unbalanced gravitational acceleration (Δg) provides insight into the underlying physics. It is pointed out that the application of magnetic field pulses of specific strength and duration will lead to direct cross-communication between spin-wave normal modes, a feature unique to the tunable local imbalanced field.


Related Articles

  • Breakdown of the Brillouin limit and classical fluxes in rotating collisional plasmas. Rax, J. M.; Fruchtman, A.; Gueroult, R.; Fisch, N. J. // Physics of Plasmas;2015, Vol. 22 Issue 9, p1 

    The classical collisionless analysis displaying the occurrence of slow and fast rigid body rotation modes in magnetized plasmas is extended to collisional discharges. Collisions speed up the fast mode, slow down the slow one, and break down the classical Brillouin limit. Rigid body rotation has...

  • Chaotic Attitude Tumbling of Satellite in Magnetic Field. Bhardwaj, Rashmi; Kaur, Parsan // American Journal of Applied Sciences;2006, Vol. 3 Issue 10, p2037 

    In this study, the half width of the chaotic separatrix has been estimated by chrikov's criterion. Through surface of section method, it has been observed that the magnetic torque parameter, the eccentricity of the orbit and the mass distribution parameter play an important in changing the...

  • Estimation of spin transfer torque effect and thermal activation effect on magnetization reversal in CoFeB/MgO/CoFeB magnetoresistive tunneling junctions. Yoshikawa, Masatoshi; Ueda, Tomomasa; Aikawa, Hisanori; Shimomura, Naoharu; Kitagawa, Eiji; Nakayama, Masahiko; Kai, Tadashi; Nishiyama, Katsuya; Nagase, Toshihiko; Kishi, Tatsuya; Ikegawa, Sumio; Yoda, Hiroaki // Journal of Applied Physics;5/1/2007, Vol. 101 Issue 9, p09A511 

    In the CoFeB/MgO/CoFeB magnetoresistive tunneling junctions, the bias-dependent magnetic switching curves are investigated and the spin transfer torque effect and the thermal activation effect on the magnetic switching are estimated. The different switching behaviors at the positive and negative...

  • Exchange switching of a magnetic junction by a current pulse. Gulyaev, Yu.; Zilberman, P.; Chigarev, S.; Epshtein, E. // Journal of Communications Technology & Electronics;Jun2011, Vol. 56 Issue 6, p683 

    Results of numerical simulation of switching of a magnetic transition induced by a spin-polarized current pulse in the presence of an external magnetic field for a current density and a field strength that are lower than the corresponding threshold values are presented. The magnetic field...

  • Rotating magnetic field current drive of high-temperature field reversed configurations with high ζ scaling. Guo, H. Y.; Hoffman, A. L.; Milroy, R. D. // Physics of Plasmas;Nov2007, Vol. 14 Issue 11, p112502 

    Greatly reduced recycling and impurity ingestion in the Translation, Confinement, and Sustainment—Upgrade (TCSU) device has allowed much higher plasma temperatures to be achieved in the field reversed configurations (FRC) under rotating magnetic field (RMF) formation and sustainment. The...

  • New integrable cases in classical problems of dynamics of rigid bodies. Pleshakov, Yu. D. // Doklady Physics;Apr2007, Vol. 52 Issue 4, p225 

    The article presents a mathematical problem on rotational motion of a charged gyroscope in a homogenous magnetic field and in an axisymmetric force field. This problem is known as generalized Grioli problem. In this type of problem, two general cases of the integrability of equations of motion...

  • Micromagnetic simulations of linewidths and nonlinear frequency shift coefficient in spin torque nano-oscillators. Carpentieri, Mario; Torres, Luis // Journal of Applied Physics;Apr2010, Vol. 107 Issue 7, p073907 

    The dependence of the linewidth on the temperature and the applied magnetic field angle is studied in spin torque nano-oscillators (STNOs) by means of full micromagnetic simulations. The analyzed spin valve is the experimental one by Sankey et al. [Phys. Rev. Lett. 96, 227601 (2006)] and the...

  • Current-driven domain-wall depinning. He, J.; Li, Z.; Zhang, S. // Journal of Applied Physics;7/1/2005, Vol. 98 Issue 1, p016108 

    The characteristics of magnetic domain-wall depinning driven by a spin transfer torque are dramatically different compared to those driven by a conventional magnetic field. By using the recently derived formalism of the spin torque, we describe key features in the dynamics of geometrically...

  • Frequency transition of spin-torque oscillator under the magnetic-field pulse in nanosecond range. Nagasawa, Tazumi; Suto, Hirofumi; Kudo, Kiwamu; Mizushima, Koichi; Sato, Rie // Journal of Applied Physics;Apr2011, Vol. 109 Issue 7, p07C907 

    We report a time domain study of the frequency transition of spin-torque oscillator (STO) under the magnetic-field pulse in nanosecond range. We fabricated the pillar-structured STO devices consisting of MgO-based tunnel junctions with CoFeB free layers. Single-shot waveforms of the STO were...


Read the Article


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

Try another library?
Sign out of this library

Other Topics