Narrow linewidth spin transfer driven vortex self-oscillations in Py/Cu/Py spin valves of elliptical cross section (160 nm x 75 nm) are investigated by means of micromagnetic simulations. "GPmagnet", a high performance GPU based micromagnetic package, is used for this purpose, allowing for 100 KHz spectral resolution at reasonable computational time. The variation of the linewidth with applied current (10 x 10(7) A/cm(2) < J < 20 x 10(7) A/cm(2)) is analyzed in the temperature range 0 K < T < 300 K. Linewidths around 1 MHz are found at T = 0 K. At T = 300 K, linewidths remain below 2 MHz for J < 16 x 10(7) A/cm(2), whereas for larger currents the presence of two oscillation modes lead to a further linewidth increase.
|Autori interni:||CARPENTIERI, Mario|
|Titolo:||Intrinsic and Thermal Linewidths of Spin-Transfer-Driven Vortex Self-Oscillations|
|Rivista:||IEEE TRANSACTIONS ON MAGNETICS|
|Data di pubblicazione:||2013|
|Digital Object Identifier (DOI):||10.1109/TMAG.2013.2248135|
|Appare nelle tipologie:||1.1 Articolo in rivista|