High-data-transfer-rate read heads composed of spin-torque oscillators

Mizushima, Koichi; Kudo, Kiwamu; Nagasawa, Tooru; Sato, Rie

doi:10.1088/1742-6596/266/1/012060

Cited by 6 publications

(1 citation statement)

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“…[23][24][25] Modulation of STOs has also been shown to be experimentally straightforward giving rise to several applications. STOs nanopillars have been proposed as hard-drive read-heads where the stray field from the perpendicular media acts a modulating source 26 both in GMR 27 and TMR 28 spin valves. From the perspective of communication applcations, Frequency Modulation (FM) has been observed in GMR nanocontacts [29][30][31][32][33][34] and more recently in nano-oxide layer (NOL) nanocontact STOs.…”

Section: Introductionmentioning

confidence: 99%

Analytical investigation of modulated spin-torque oscillators in the framework of coupled differential equations with variable coefficients

Iacocca

Åkerman

2012

Phys. Rev. B

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Modulation of Spin Torque Oscillators (STOs) is investigated by analytically solving the timedependent coupled equations of an auto-oscillator. A Fourier series solution is proposed, leading to the coefficients being determined with a linear set of equations, from which a Nonlinear Amplitude and Frequency Modulation (NFAM) scheme is obtained. In this framework, the NFAM features are related to the intrinsic STO parameters, revealing a frequency-dependence of the harmonicdependent modulation index that allows a modulation bandwidth to be defined for these devices. The presented results expose a rich parameter space, where the modulation and the STO's operation conditions define the observed modulation features. The Fourier-series representation of the time signal is suitable for studying periodic perturbations on the auto-oscillator equation.

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