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Detection of spin torque magnetization dynamics through low frequency noise

Author
Cascales, Juan Pedro; Herranz, David; Ebels, Ursula; Katine, Jordan A.; Aliev Kazanski, Farkhaduntranslated
Entity
UAM. Departamento de Física de la Materia Condensada
Publisher
American Institute of Physics Publising LLC
Date
2015-08-03
Citation
10.1063/1.4927827
Applied Physics Letters 107.5 (2015): 052401
 
 
 
ISSN
0003-6951 (print); 1077-3118 (online)
DOI
10.1063/1.4927827
Funded by
We would like to acknowledge the support by the Spanish MINECO (MAT2012-32743), and the Comunidad de Madrid through NANOFRONTMAG-CM (S2013/MIT- 2850) and CCC-UAM (SVORTEX)
Project
Gobierno de España. MAT2012-32743; Comunidad de Madrid. S2013/MIT-2850/NANOFRONTMAG
Editor's Version
http://dx.doi.org/10.1063/1.4927827
Subjects
Dynamics; Magnetization; Spurious signal noise; Tunnel junctions; Física
URI
http://hdl.handle.net/10486/674798
Rights
© 2015 AIP Publishing LLC

Abstract

We present a comparative study of high frequency dynamics and low frequency noise in elliptical magnetic tunnel junctions with lateral dimensions under 100 nm presenting current-switching phenomena. The analysis of the high frequency oscillation modes with respect to the current reveals the onset of a steady-state precession regime for negative bias currents above J = 10 7 A / cm 2, when the magnetic field is applied along the easy axis of magnetization. By the study of low frequency noise for the same samples, we demonstrate the direct link between changes in the oscillation modes with the applied current and the normalised low frequency (1/f) noise as a function of the bias current. These findings prove that low frequency noise studies could be a simple and powerful technique to investigate spin-torque based magnetization dynamics
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  • Producción científica en acceso abierto de la UAM [18064]

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