Configurational dependence of the magnetization dynamics in spin valve systems: Influence of spin pumping and domain wall induced coupling

Salikhov, Ruslan; Abrudan, R.; Brüssing, F.; Gross, K.; Luo, Chen; Westerholt, K.; Zabel, H.; Radu, F.; Гарифуллин, И. А.

doi:10.1103/physrevb.86.144422

Cited by 18 publications

(24 citation statements)

References 27 publications

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“…[ 19 ]. Probably this effect was observed in several papers [ [20][21][22] ]. However, its interpretation in these papers fully ignores the hybridization of resonance modes, and therefore it is hard to draw some clear conclusions.…”

Section: Hybridization Versus Non-local Dampingmentioning

confidence: 75%

Dynamic exchange via spin currents in acoustic and optical modes of ferromagnetic resonance in spin-valve structures

et al. 2014

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Two ferromagnetic layers magnetically decoupled by a thick normal metal spacer layer can be, nevertheless, dynamically coupled via spin currents emitted by the spin-pump and absorbed through the spin-torque effects at the neighboring interfaces. A decrease of damping in both layers due to a partial compensation of the angular momentum leakage in each layer was previously observed at the coincidence of the two ferromagnetic resonances. In case of non-zero magnetic coupling, such a dynamic exchange will depend on the mutual precession of the magnetic moments in the layers. A difference in the linewidth of the resonance peaks is expected for the acoustic and optical regimes of precession. However, the interlayer coupling hybridizes the resonance responses of the layers and therefore can also change their linewidths. The interplay between the two mechanisms has never been considered before. In the present work, the joint influence of the hybridization and non-local damping on the linewidth has been studied in weakly coupled NiFe/CoFe/Cu/CoFe/MnIr spin-valve multilayers. It has been found that the dynamic exchange by spin currents is different in the optical and acoustic modes, and this difference is dependent on the interlayer coupling strength. In contrast to the acoustic precession mode, the dynamic exchange in the optical mode works as an additional damping source. A simulation in the framework of the LandauLifshitz-Gilbert formalism for two ferromagnetic layers coupled magnetically and by spin currents has been done to separate the effects of the non-local damping from the resonance modes hybridization. In our samples both mechanisms bring about linewidth changes of the same order of magnitude, but lead to a distinctly different angular behavior. The obtained results are relevant for a broad class of coupled magnetic multilayers with ballistic regime of the spin transport.

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Section: Hybridization Versus Non-local Dampingmentioning

confidence: 75%

Dynamic exchange via spin currents in acoustic and optical modes of ferromagnetic resonance in spin-valve structures

et al. 2014

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“…87 The ability of TR-XRMS to probe element specific free precessional magnetization dynamics allows studies of artificially prepared complex structures with more than one magnetic material. We have studied the free precessional dynamics of the Fe magnetic moments in Ni 81 Fe 19 alloy films (Py), 75 in spin valve type trilayers such as Co/Cu/Py, Co 2 MnGe/V/Py and Co 2 MnGe/Au/Py, 77,78,88 or Py/Cu and Py/AlO multilayer structures. 76 An interesting effect has been found by studying magnetization precessional dynamics of Py layers in the Co/Cu/Py spin valves having two different configurations of mutual orientation of magnetization in Py and Co layers: parallel (P) and antiparallel (AP).…”

Section: Selected Resultsmentioning

confidence: 99%

“…The two magnon scattering in the Py film is only observed when the Co 2 MnGe Heusler layer is in a domain state, generating inhomogeneous stray fields from the domain walls. 78,88 Moreover, TR-XRMS was used to study the dynamics in Py/Cu and Py/AlO x multilayer systems as well as simple alloys with different stoichiometries (Fe x Ni 1−x ) and for rare-earth (Gd, Dy) doped permalloy layers. 85…”

Section: Selected Resultsmentioning

confidence: 99%

“…Another transient state can be excited that changes the direction of the magnetization after field pulse excitation, followed by a damped precessional motion about the new field direction. [74][75][76][77][78] Implementation of time-resolved XRMS (TR-XRMS) for probing the transverse magnetization dynamics has the advantages of being element specific and sensitive to layer thickness and interfaces, which is particularly advantageous for investigations of magnetic heterostructures. It should also be mentioned that similar methods have been developed for studying the magnetization dynamics on the picosecond time scale, including the use of microwave excitations phase-locked with photon bunch frequency.…”

Section: B Magnetic Field Pulse (Pump)-x-ray (Probe) Experimentsmentioning

confidence: 99%

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ALICE—An advanced reflectometer for static and dynamic experiments in magnetism at synchrotron radiation facilities

Abrudan

Brüssing

Salikhov

et al. 2015

Review of Scientific Instruments

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We report on significant developments of a high vacuum reflectometer (diffractometer) and spectrometer for soft x-ray synchrotron experiments which allows conducting a wide range of static and dynamic experiments. Although the chamber named ALICE was designed for the analysis of magnetic hetero- and nanostructures via resonant magnetic x-ray scattering, the instrument is not limited to this technique. The versatility of the instrument was testified by a series of pilot experiments. Static measurements involve the possibility to use scattering and spectroscopy synchrotron based techniques (photon-in photon-out, photon-in electron-out, and coherent scattering). Dynamic experiments require either laser or magnetic field pulses to excite the spin system followed by x-ray probe in the time domain from nano- to femtosecond delay times. In this temporal range, the demagnetization/remagnetization dynamics and magnetization precession in a number of magnetic materials (metals, alloys, and magnetic multilayers) can be probed in an element specific manner. We demonstrate here the capabilities of the system to host a variety of experiments, featuring ALICE as one of the most versatile and demanded instruments at the Helmholtz Center in Berlin-BESSY II synchrotron center in Berlin, Germany.

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“…Even more complex are asymmetric superlattices of the type [F 1 /N/F 2 /N] Â n with different ferromagnetic layers F 1 and F 2 . On one hand, asymmetric superlattices open up new degrees of freedom for static and dynamic exchange coupling, 6 including spin valve characteristics 7 and spin pumping effects, [8][9][10] which are essential ingredients of spintronic devices. [11][12][13][14][15][16] Furthermore, stacking a sequence of spin-valves into a superlattice enables the magnetic rachet effect, which has the potential of dramatically increasing the non-volatile memory capacity of information storage devices.…”

Section: Introductionmentioning

confidence: 99%

Laterally patterned spin-valve superlattice: Magnetometry and polarized neutron scattering study

Brüssing

Toperverg

Devishvili

et al. 2015

Journal of Applied Physics

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The magnetization reversal of magnetic multilayers with spin-valve like characteristics, patterned into an array of parallel stripes, was structurally and magnetically analyzed, in detail, via x-ray scattering, magnetometry, and polarized neutron reflectivity. Each stripe contains a multiple repetition of the layer sequence [Fe/Cr/Co/Cr]. X-ray and neutron scattering maps of the patterned multilayer show rich details resulting from the superposition of Bragg peaks representing the lateral in-plane periodicity and the out-of-plane multilayer period. Detailed analysis of specular and off-specular polarized neutron intensity was used to ascertain the antiparallel alignment of the Co and Fe magnetization within the kink region of their combined hysteresis loop between the coercive fields of Fe and Co layers. This includes also an examination of domain formation and inter-as well as intra-stripe correlation effects upon magnetization reversal. Our combined study shows that the shape induced anisotropy via patterning is capable of overriding the four-fold crystal anisotropy but is unable to eliminate the ripple domain state of the Co layers, already present in the continuous multilayer. V C 2015 AIP Publishing LLC. [http://dx.

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Configurational dependence of the magnetization dynamics in spin valve systems: Influence of spin pumping and domain wall induced coupling

Cited by 18 publications

References 27 publications

Dynamic exchange via spin currents in acoustic and optical modes of ferromagnetic resonance in spin-valve structures

Dynamic exchange via spin currents in acoustic and optical modes of ferromagnetic resonance in spin-valve structures

ALICE—An advanced reflectometer for static and dynamic experiments in magnetism at synchrotron radiation facilities

Laterally patterned spin-valve superlattice: Magnetometry and polarized neutron scattering study

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