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Proposal for a Domain Wall Nano-Oscillator driven by Non-uniform Spin Currents.

Sharma S, Muralidharan B, Tulapurkar A - Sci Rep (2015)

Bottom Line: We show that such oscillations are stable under noise and can exhibit a quality factor of over 1000.A domain wall under dynamic translation, not only being a source for rich physics, is also a promising candidate for advancements in nanoelectronics with the actively researched racetrack memory architecture, digital and analog switching paradigms as candidate examples.Devising a stable rf oscillator using a domain wall is hence another step towards the realization of an all domain wall logic scheme.

View Article: PubMed Central - PubMed

Affiliation: Department of Electrical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India.

ABSTRACT
We propose a new mechanism and a related device concept for a robust, magnetic field tunable radio-frequency (rf) oscillator using the self oscillation of a magnetic domain wall subject to a uniform static magnetic field and a spatially non-uniform vertical dc spin current. The self oscillation of the domain wall is created as it translates periodically between two unstable positions, one being in the region where both the dc spin current and the magnetic field are present, and the other, being where only the magnetic field is present. The vertical dc spin current pushes it away from one unstable position while the magnetic field pushes it away from the other. We show that such oscillations are stable under noise and can exhibit a quality factor of over 1000. A domain wall under dynamic translation, not only being a source for rich physics, is also a promising candidate for advancements in nanoelectronics with the actively researched racetrack memory architecture, digital and analog switching paradigms as candidate examples. Devising a stable rf oscillator using a domain wall is hence another step towards the realization of an all domain wall logic scheme.

No MeSH data available.


Noise Analysis.Power Spectral Density of the domain wall position for three values of the applied field and with the spin current density fixed at 0.96 GA/m2. It shows peaks at the expected values of the oscillation frequency with small width due to noise.
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f4: Noise Analysis.Power Spectral Density of the domain wall position for three values of the applied field and with the spin current density fixed at 0.96 GA/m2. It shows peaks at the expected values of the oscillation frequency with small width due to noise.

Mentions: where has been chosen such that Fokker-Planck equation corresponding to Langevin equations Eq (10) and Eq (11) admits the Boltzmann distribution in steady state. We simulated the above equations at a room temperature of 300 K for 40 μs for various values of spin current and magnetic field. The power spectral density (PSD) of Z for three values of the applied magnetic field is plotted in Fig. 4. From the simulated spectrum we find that the quality factor of the oscillator is ~550, ~1100 and ~1400 respectively for the applied fields of 8 kA/m, 10 kA/m and 12 kA/m respectively.


Proposal for a Domain Wall Nano-Oscillator driven by Non-uniform Spin Currents.

Sharma S, Muralidharan B, Tulapurkar A - Sci Rep (2015)

Noise Analysis.Power Spectral Density of the domain wall position for three values of the applied field and with the spin current density fixed at 0.96 GA/m2. It shows peaks at the expected values of the oscillation frequency with small width due to noise.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4588506&req=5

f4: Noise Analysis.Power Spectral Density of the domain wall position for three values of the applied field and with the spin current density fixed at 0.96 GA/m2. It shows peaks at the expected values of the oscillation frequency with small width due to noise.
Mentions: where has been chosen such that Fokker-Planck equation corresponding to Langevin equations Eq (10) and Eq (11) admits the Boltzmann distribution in steady state. We simulated the above equations at a room temperature of 300 K for 40 μs for various values of spin current and magnetic field. The power spectral density (PSD) of Z for three values of the applied magnetic field is plotted in Fig. 4. From the simulated spectrum we find that the quality factor of the oscillator is ~550, ~1100 and ~1400 respectively for the applied fields of 8 kA/m, 10 kA/m and 12 kA/m respectively.

Bottom Line: We show that such oscillations are stable under noise and can exhibit a quality factor of over 1000.A domain wall under dynamic translation, not only being a source for rich physics, is also a promising candidate for advancements in nanoelectronics with the actively researched racetrack memory architecture, digital and analog switching paradigms as candidate examples.Devising a stable rf oscillator using a domain wall is hence another step towards the realization of an all domain wall logic scheme.

View Article: PubMed Central - PubMed

Affiliation: Department of Electrical Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India.

ABSTRACT
We propose a new mechanism and a related device concept for a robust, magnetic field tunable radio-frequency (rf) oscillator using the self oscillation of a magnetic domain wall subject to a uniform static magnetic field and a spatially non-uniform vertical dc spin current. The self oscillation of the domain wall is created as it translates periodically between two unstable positions, one being in the region where both the dc spin current and the magnetic field are present, and the other, being where only the magnetic field is present. The vertical dc spin current pushes it away from one unstable position while the magnetic field pushes it away from the other. We show that such oscillations are stable under noise and can exhibit a quality factor of over 1000. A domain wall under dynamic translation, not only being a source for rich physics, is also a promising candidate for advancements in nanoelectronics with the actively researched racetrack memory architecture, digital and analog switching paradigms as candidate examples. Devising a stable rf oscillator using a domain wall is hence another step towards the realization of an all domain wall logic scheme.

No MeSH data available.