Mode-hopping mechanism generating colored noise in a magnetic tunnel junction based spin torque oscillator

Raghav Sharma; Philipp Durrenfeld; Ezio Iacocca; O. G. Heinonen; Johan Akerman; Pranaba K. Muduli

doi:10.1063/1.4896634

Mode-hopping mechanism generating colored noise in a magnetic tunnel junction based spin torque oscillator

Raghav Sharma, Philipp Durrenfeld, Ezio Iacocca, O. G. Heinonen, Johan Akerman, Pranaba K. Muduli

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Abstract

The frequency noise spectrum of a magnetic tunnel junction based spin torque oscillator is examined where multiple modes and mode-hopping events are observed. The frequency noise spectrum is found to consist of both white noise and 1/f frequency noise. We find a systematic and similar dependence of both white noise and 1/f frequency noise on bias current and the relative angle between the reference and free layers, which changes the effective damping and hence the mode-hopping behavior in this system. The frequency at which the 1/f frequency noise changes to white noise increases as the free layer is aligned away from the anti-parallel orientation w.r.t the reference layer. These results indicate that the origin of 1/f frequency noise is related to mode-hopping, which produces both white noise as well as 1/f frequency noise similar to the case of ring lasers.

Original language	English
Article number	132404
Journal	Applied Physics Letters
Volume	105
Issue number	13
DOIs	https://doi.org/10.1063/1.4896634
Publication status	Published - 29 Sept 2014
Externally published	Yes

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title = "Mode-hopping mechanism generating colored noise in a magnetic tunnel junction based spin torque oscillator",

abstract = "The frequency noise spectrum of a magnetic tunnel junction based spin torque oscillator is examined where multiple modes and mode-hopping events are observed. The frequency noise spectrum is found to consist of both white noise and 1/f frequency noise. We find a systematic and similar dependence of both white noise and 1/f frequency noise on bias current and the relative angle between the reference and free layers, which changes the effective damping and hence the mode-hopping behavior in this system. The frequency at which the 1/f frequency noise changes to white noise increases as the free layer is aligned away from the anti-parallel orientation w.r.t the reference layer. These results indicate that the origin of 1/f frequency noise is related to mode-hopping, which produces both white noise as well as 1/f frequency noise similar to the case of ring lasers.",

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AU - Sharma, Raghav

AU - Durrenfeld, Philipp

AU - Iacocca, Ezio

AU - Heinonen, O. G.

AU - Akerman, Johan

AU - Muduli, Pranaba K.

PY - 2014/9/29

Y1 - 2014/9/29

N2 - The frequency noise spectrum of a magnetic tunnel junction based spin torque oscillator is examined where multiple modes and mode-hopping events are observed. The frequency noise spectrum is found to consist of both white noise and 1/f frequency noise. We find a systematic and similar dependence of both white noise and 1/f frequency noise on bias current and the relative angle between the reference and free layers, which changes the effective damping and hence the mode-hopping behavior in this system. The frequency at which the 1/f frequency noise changes to white noise increases as the free layer is aligned away from the anti-parallel orientation w.r.t the reference layer. These results indicate that the origin of 1/f frequency noise is related to mode-hopping, which produces both white noise as well as 1/f frequency noise similar to the case of ring lasers.

AB - The frequency noise spectrum of a magnetic tunnel junction based spin torque oscillator is examined where multiple modes and mode-hopping events are observed. The frequency noise spectrum is found to consist of both white noise and 1/f frequency noise. We find a systematic and similar dependence of both white noise and 1/f frequency noise on bias current and the relative angle between the reference and free layers, which changes the effective damping and hence the mode-hopping behavior in this system. The frequency at which the 1/f frequency noise changes to white noise increases as the free layer is aligned away from the anti-parallel orientation w.r.t the reference layer. These results indicate that the origin of 1/f frequency noise is related to mode-hopping, which produces both white noise as well as 1/f frequency noise similar to the case of ring lasers.

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DO - 10.1063/1.4896634

M3 - Article

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VL - 105

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 13

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ER -

Mode-hopping mechanism generating colored noise in a magnetic tunnel junction based spin torque oscillator

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