We report on a highly efficient spin diode effect in an exchange-biased spin-valve giant magnetoresistance (GMR) strips. In such multilayer structures, symmetry of the current distribution along the vertical direction is broken and, as a result, a non-compensated Oersted field acting on the magnetic free layer appears. This field, in turn, is a driving force of magnetization precessions. Due to the GMR effect, resistance of the strip oscillates following the magnetization dynamics. This leads to rectification of the applied radio frequency current and induces a direct current voltage VDC. We present a theoretical description of this phenomenon and calculate the spin diode signal, VDC, as a function of frequency, external magnetic field, and angle at which the external field is applied. A satisfactory quantitative agreement between theoretical predictions and experimental data has been achieved. Finally, we show that the spin diode signal in GMR devices is significantly stronger than in the anisotropic magnetoresistance permalloy-based devices.
@article{arxiv.1410.6672,
title = {Rectification of radio frequency current in giant magnetoresistance spin valve},
author = {Sławomir Ziętek and Piotr Ogrodnik and Marek Frankowski and Jakub Chęciński and Piotr Wiśniowski and Witold Skowroński and Jerzy Wrona and Tomasz Stobiecki and Antoni Żywczak and Józef Barnaś},
journal= {arXiv preprint arXiv:1410.6672},
year = {2015}
}