Electromechanical probing of ionic currents in energy storage materials

A. N. Morozovska, E. A. Eliseev, and S. V. Kalinin

The frequency dependent strain response of a one-dimensional electrochemically active system to a periodic electric bias is analyzed. The sensitivity and resolution of electrochemical strain measurements are compared to current-based electrochemical impedance spectroscopy. The resolution and detection limits of interferometric and atomic force microscopy based systems for probing electrochemical reactions on the nanoscale are analyzed.

Appl. Phys. Lett. 96, 222906 (2010)

Nonuniformity of a planar polarizer for spin-transfer-induced vortex oscillations at zero field

A. V. Khvalkovskiy, J. Grollier, N. Locatelli, Ya. V. Gorbunov, K. A. Zvezdin, and V. Cros

We discuss a possible mechanism of the spin-transfer-induced oscillations of a vortex in the free layer of spin-valve nanostructures, in which the polarizer layer has a planar magnetization. We demonstrate that if such planar polarizer is essentially nonuniform, steady gyrotropic vortex motion with large amplitude can be excited.

Appl. Phys. Lett. 96, 212507 (2010)