Dependence of resistance drift on the amorphous cap size in phase change memory arrays

Braga, Stefania; Cabrini, Alessandro; Torelli, Guido
March 2009
Applied Physics Letters;3/2/2009, Vol. 94 Issue 9, pN.PAG
Academic Journal
Multilevel programming in phase change memories (PCMs) requires understanding of the phenomena which affect the stability of the programmed resistance levels. Although the Ge2Sb2Te5 (GST alloy) crystallization process has been extensively studied, further analysis is needed to characterize the drift of low-field amorphous-GST resistance. In this paper, we carry out a statistical analysis on an array of PCM cells so as to investigate the drift dynamics of intermediate GST resistance states. Our experimental results reveal the dependence of the drift dynamics exponent on the thickness of the amorphous cap inside the GST layer, which is ascribed to the different stresses.


Related Articles

  • Mixing effects in glass-forming Lennard-Jones mixtures. Valdes, L.-C.; Affouard, F.; Descamps, M.; Habasaki, J. // Journal of Chemical Physics;4/21/2009, Vol. 130 Issue 15, p154505 

    Mixing effects have been investigated from molecular dynamics simulations at constant number of particles, volume, and temperature on the Kob–Andersen glass-forming Lennard-Jones atomic mixture AxB1-x for 0≤x≤1 compositions. Upon cooling, crystallization is observed for...

  • Structural study of the Eu3+ environments in fluorozirconate glasses: Role of the temperature-induced and the pressure-induced phase transition processes in the development of a rare earth’s local structure model. Muñoz-Santiuste, Juan E.; Rodríguez-Mendoza, Ulises R.; González-Platas, Javier; Lavín, Víctor // Journal of Chemical Physics;4/21/2009, Vol. 130 Issue 15, p154501 

    The correlation between the optical properties of the Eu3+ ions and their local structures in fluorozirconate glasses and glass-ceramics have been analyzed by means of steady-state and time-resolved site-selective laser spectroscopies. Changes in the crystal-field interaction, ranging from weak...

  • Bilayered smectic phase polymorphism in the dipolar Gay–Berne liquid crystal model. Houssa, Mohammed; Rull, Luis F.; Romero-Enrique, Jose M. // Journal of Chemical Physics;4/21/2009, Vol. 130 Issue 15, p154504 

    We present computer simulations of the Gay–Berne model with a strong terminal dipole. We report the existence of different stable antiferroelectric interdigitated bilayered phases in this model with diverse in-plane organization. The occurrence of these phases depends crucially on the...

  • Simple models for two-dimensional tunable colloidal crystals in rotating ac electric fields. Elsner, Nils; Royall, C. Patrick; Vincent, Brian; Snoswell, David R. E. // Journal of Chemical Physics;4/21/2009, Vol. 130 Issue 15, p154901 

    We compare the behavior of a new two-dimensional aqueous colloidal model system with a simple numerical treatment. To the first order the attractive interaction between the colloids induced by an in-plane rotating ac electric field is dipolar, while the charge stabilization leads to a shorter...

  • Effect of polydispersity on the relative stability of hard-sphere crystals. Mingcheng Yang; Hongru Ma // Journal of Chemical Physics;4/7/2008, Vol. 128 Issue 13, p134510 

    By extending the nonequilibrium potential refinement algorithm and lattice switch method to the semigrand ensemble, the semigrand potentials of the fcc and hcp structures of polydisperse hard-sphere crystals are calculated with the bias sampling scheme. The result shows that the fcc structure is...

  • Entanglement of spin pairs in alternating open spin-1/2 chains with the XY Hamiltonian. Doronin, S. I.; Pyrkov, A. N.; Fel'dman, E. B. // Journal of Experimental & Theoretical Physics;Dec2007, Vol. 105 Issue 5, p953 

    We investigate entanglement of spin pairs in alternating open spin chains ( s = 1/2) with spin-spin interactions (SSI) in the thermodynamic equilibrium state in an external magnetic field. The reduced density matrix of an arbitrarily chosen spin pair was calculated. The entanglement of a spin...

  • Pattern formation in a mass transfer convective experiment. Maza, Diego; Wolluschek, Cecilia; Mancini, Hector // AIP Conference Proceedings;2004, Vol. 742 Issue 1, p165 

    We present experimental results in a mass transfer driven convective experiment. A layer of volatile fluid, is covered by a second one less dense but non volatile immiscible fluid. This configuration results unstable for appropriated depths of the top layer. Under this condition, low...

  • A Weakly Nonideal Bose Gas Model Leading to the Fountain Effect. Maslov, V. P. // Theoretical & Mathematical Physics;Jun2003, Vol. 135 Issue 3, p889 

    The ordinary thermodynamics corresponds to the equilibrium ground state of the system. We present a model making it possible to construct a “second thermodynamics,” an analogue of an equilibrium state of a superfluid, based on which we explain the effect of the appearance of a...

  • Optimal Protocols and Tradeoffs in Quantum Key Distribution. Renes, Joseph M. // AIP Conference Proceedings;2004, Vol. 734 Issue 1, p327 

    Quantum key distribution protocols based on equiangular spherical codes are introduced and a security comparison made to random and unbiased-bases schemes in two and three dimensions. Attention is limited to intercept/resend attacks for simplicity. In each case, a general tradeoff between...


Read the Article


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

Try another library?
Sign out of this library

Other Topics