Spin-wave excitations in finite rectangular elements of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Ni</mml:mi><mml:mn>80</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Fe</mml:mi><mml:mn>20</mml:mn></mml:msub></mml:mrow></mml:math>

Bayer, Christian; Jorzick, J.; Hillebrands, B.; Demokritov, S. O.; Kouba, Robert; Bozinoski, R.; Slavin, A. N.; Guslienko, K. Yu.; Berkov, D. V.; Gorn, N. L.; Kostylev, Mikhail

doi:10.1103/physrevb.72.064427

Cited by 154 publications

(99 citation statements)

References 38 publications

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“…In our case, magnetization oscillations in the linear regime are already localized within the Py nanowire area under the CoFe nanomagnet due to the stray field form the CoFe nanomagnet. Analogous localization of thermal spin waves was observed in patterned nanoelement arrays 38 . 4) At a relatively high current, I sw , the system switches to a qualitatively different magnetization state.…”

Section: A General Features Of the Magnetization Oscillationsmentioning

confidence: 77%

“…This situation is fully analogous to the localization of edge modes in patterned nanoelements 38 , where the self-demagnetizing field of the nanoelement is directed opposite to the external field, creating a potential well for the magnetization oscillations. An important distinct feature of our system is the strong asymmetry of the CoFe stray field with respect to the nanowire axis (resulting from the C-state of CoFe magnetization, see Fig.…”

Section: B Effect Of the Py Exchange Constant A Pymentioning

confidence: 99%

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Micromagnetic simulations of magnetization dynamics in a nanowire induced by a spin-polarized current injected via a point contact

Berkov

Boone

2011

Phys. Rev. B

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We present a detailed numerical analysis of the magnetization auto-oscillations induced in a thin NiFe nanowire by a direct spin polarized current injected via a square-shaped CoFe nanomagnet (a system experimentally studied in C. Boone et al., Phys. Rev. B 79, 140404 (2009)). We demonstrate that all auto-oscillation modes in the nanowire are localized under the nanocontact for magnetic field applied in the plane of the nanowire. This mode localization is induced by a strong stray magnetic field acting on the NiFe nanowire from the CoFe current injector. We find that the auto-oscillation frequency, power and the frequency shift with the current strongly depend on the exchange constant of NiFe. We also find that the auto-oscillation power depends non-monotonically on the CoFe saturation magnetization, and demonstrate that this effect has its origin in resonant excitation of the CoFe eigenmodes by magnetization oscillations in the NiFe nanowire. The calculated dependence of the oscillation frequency on current is in a good agreement with the experiment. However, the agreement between theory and experiment for the oscillation power is unsatisfactory. Finally, we have shown that an auto-oscillatory mode propagating along the nanowire in the system under study is possible when a sufficiently strong out-of-plane field is applied.

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Section: A General Features Of the Magnetization Oscillationsmentioning

confidence: 77%

Section: B Effect Of the Py Exchange Constant A Pymentioning

confidence: 99%

Micromagnetic simulations of magnetization dynamics in a nanowire induced by a spin-polarized current injected via a point contact

Berkov

Boone

2011

Phys. Rev. B

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“…However, one can see also a second peak at about 4.3 GHz (M1), which corresponds to the edge-mode, i.e. a mode localized in the region where the effective field is reduced due to the demagnetizing field of the transversely magnetized NW [19,20,21].…”

Section: Resultsmentioning

confidence: 99%

Micro-focused Brillouin light scattering study of the magnetization dynamics driven by Spin Hall effect in a transversely magnetized NiFe nanowire

Madami

Gubbiotti

Moriyama

et al. 2015

Journal of Applied Physics

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We employed micro-focused Brillouin light scattering to study the amplification of the thermal spin wave eigenmodes by means of a pure spin current, generated by the spin-Hall effect, in a transversely magnetized Pt(4nm)/NiFe(4nm)/SiO 2 (5nm) layered nanowire with lateral dimensions 500×2750 nm 2 . The frequency and the cross section of both the center (fundamental) and the edge spin wave modes have been measured as a function of the intensity of the injected dc electric current. The frequency of both modes exhibits a clear redshift while their cross section is greatly enhanced on increasing the intensity of the injected dc. A threshold-like behavior is observed for a value of the injected dc of 2.8 mA. Interestingly an additional mode, localized in the central part of the nanowire, appears at higher frequency on increasing the intensity of the injected dc above the threshold value. Micromagnetic simulations were used to quantitatively reproduce the experimental results and to investigate the complex non-linear dynamics induced by the spin-Hall effect, including the modification of the spatial profile of the spin wave modes and the appearance of the extra mode above the threshold.

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“…According to Guslienko et al 28 and Bayer et al 2 , the frequency of the quantized SW modes (or Eigen-modes) of a strip can be evaluated from the solution of the LLG equation and is given by …”

Section: Excited Spin-wave Modesmentioning

confidence: 99%

Anomalous Hall voltage rectification and quantized spin-wave excitation induced by simultaneous application of dc and rf currents in a single-layeredNi81Fe19nanoscale wire

et al. 2009

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(K.M.) and miyajima@phys.keio.ac.jp (H. M.) 2/42[Abstract]An anomalous Hall effect and rectification of a Hall voltage are observed by applying a radio-frequency (rf) current through a single-layered ferromagnetic wire located on a coplanar waveguide. The components of the magnetization precession, both in and perpendicular to the plane, can be detected via the Hall voltage rectification of the rf current by incorporating an additional direct (dc) current. In this paper, we propose a phenomenological model, which describes the time-dependent anisotropic magnetoresistance and time-dependent planer Hall effect. The nonlinearity of the spin dynamics accompanied by spin-waves as functions of rf and dc currents is also studied, as well as those of the magnitude and orientation of the external magnetic field.3/42

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Spin-wave excitations in finite rectangular elements ofNi80Fe20

Cited by 154 publications

References 38 publications

Micromagnetic simulations of magnetization dynamics in a nanowire induced by a spin-polarized current injected via a point contact

Micromagnetic simulations of magnetization dynamics in a nanowire induced by a spin-polarized current injected via a point contact

Micro-focused Brillouin light scattering study of the magnetization dynamics driven by Spin Hall effect in a transversely magnetized NiFe nanowire

Anomalous Hall voltage rectification and quantized spin-wave excitation induced by simultaneous application of dc and rf currents in a single-layeredNi81Fe19nanoscale wire

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