Influence of geometry on current-driven vortex oscillations in nanocontact devices

Jaromirska, E.; López-Dı́az, L.; Ruotolo, A.; Grollier, Julie; Cros, Vincent; Berkov, D. V.

doi:10.1103/physrevb.83.094419

Cited by 25 publications

(13 citation statements)

References 26 publications

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“…First of all it should be noted that since κ > 0 than accordingly to (19) the current plays role of an effective damping. That explains why we omitted weak natural damping in Eq.…”

Section: Harmonic Approximationmentioning

confidence: 99%

Magnetic vortex-antivortex crystals generated by spin-polarized current

et al. 2012

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We study vortex pattern formation in thin ferromagnetic films under the action of strong spinpolarized currents. Considering the currents which are polarized along the normal of the film plane, we determine the critical current above which the film goes to a saturated state with all magnetic moments being perpendicular to the film plane. We show that stable square vortex-antivortex superlattices (vortex crystals) appears slightly below the critical current. The melting of the vortex crystal occurs with current further decreasing. A mechanism of current-induced periodic vortexantivortex lattice formation is proposed. Micromagnetic simulations confirm our analytical results with a high accuracy.

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“…First of all it should be noted that since κ > 0 than accordingly to (19) the current plays role of an effective damping. That explains why we omitted weak natural damping in Eq.…”

Section: Harmonic Approximationmentioning

confidence: 99%

Magnetic vortex-antivortex crystals generated by spin-polarized current

et al. 2012

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“…In most studies synchronization of STNOs with a nearly collinear magnetization configuration within the contact area is considered. Only recently it has been shown that a steadystate vortex gyration [15][16][17][18] is also a possible candidate for realizing a system of synchronized STNOs [7,14].…”

Section: Introductionmentioning

confidence: 99%

Robust synchronization of an arbitrary number of spin-torque-driven vortex nano-oscillators

Erokhin¹,

Berkov²

2014

Phys. Rev. B

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Non-linear magnetization dynamics in ferromagnetic nanoelements excited by the spin-polarized dc-current is one of the most intensively studied phenomena in solid state magnetism. Despite immense efforts, synchronization of oscillations induced in several such nanoelements (spin-torque driven nanooscillators, or STNO) still represents a major challenge both from the fundamental and technological points of view. In this paper we propose a system where synchronization of any number of STNOs, represented by magnetization vortices inside squared nanoelements, can be easily achieved. Using full-scale micromagnetic simulations we show that synchronization of these STNOs is extremely dynamically stable due to their very large coupling energy provided by the magnetodipolar interaction. Finally, we demonstrate that our concept allows robust synchronization of an arbitrary number of STNOs (arranged either as a 1D chain or as a 2D array), even when current supplying nanocontacts have a broad size distribution.

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“…Pribiag et al firstly reported the excitation of vortex oscillations by means of dc currents in a nanoscale spin valve structure [7]. From then on, the gyration of vortex driven by spin-polarized currents in nanopillars [8][9][10][11][12][13][14][15][16] and single-nanocontact structures [17][18][19][20][21][22][23][24] have raised strong interests because it represents not only a very interesting phenomenon from the fundamental point view, but also is a very promising candidate for spin torque nano-oscillators [25].…”

Section: Introductionmentioning

confidence: 99%

Magnetic vortex gyration in a confined double-nanocontacts structure

Liu

et al. 2014

Solid State Communications

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Influence of geometry on current-driven vortex oscillations in nanocontact devices

Cited by 25 publications

References 26 publications

Magnetic vortex-antivortex crystals generated by spin-polarized current

Magnetic vortex-antivortex crystals generated by spin-polarized current

Robust synchronization of an arbitrary number of spin-torque-driven vortex nano-oscillators

Magnetic vortex gyration in a confined double-nanocontacts structure

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