Spin wave excitations in exchange-coupled [Co/Pd]-NiFe films with tunable tilting of the magnetization

Tacchi, S.; Nguyễn, Thị Ngọc Anh; Carlotti, G.; Gubbiotti, G.; Madami, M.; Dumas, Randy K.; Lau, June W.; Åkerman, Johan; Rettori, A.; Pini, M. G.

doi:10.1103/physrevb.87.144426

Cited by 27 publications

(24 citation statements)

References 33 publications

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“…In this work, we investigate the role of the soft layer on the magnetic anisotropy, domain structure and damping in exchange-coupled [Co/Pd] 5 /NiFe films. The results are extended to a wider range of NiFe layer thicknesses, from 3 nm to 80 nm, compared with previous studies 16,17,19 . Also we characterize damping and anisotropy by ferromagnetic resonance measurements, and domain structure by magnetic imaging and simulation.…”

Section: 15supporting

confidence: 51%

Magnetic structure and anisotropy of[Co/Pd]5/NiFemultilayers

et al. 2015

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The magnetization behavior, magnetic anisotropy and domain congurations of Co/Pd multilayers with perpendicular magnetic anisotropy capped with permalloy is investigated using magnetometry, magnetic force microscopy and ferromagnetic resonance. The thickness of the Ni80Fe20 layer in [Co/Pd]5/NiFe(t) was varied from t = 0 nm to 80 nm in order to study the interplay between the anisotropy and magnetization directions of the Co/Pd and the NiFe. By varying the thickness of the NiFe layer the net anisotropy changes sign, but domains with plane-normal magnetization are present even for the thickest NiFe. Ferromagnetic resonance measurements show a decrease in damping with increasing NiFe thickness. The results demonstrate how the magnetic behavior of mixed-anisotropy thin films can be controlled.

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Section: 15supporting

confidence: 51%

Magnetic structure and anisotropy of[Co/Pd]5/NiFemultilayers

et al. 2015

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“…[90], [91], [92]. Subsequent measurements have then focused on the fundamental spin wave excitations in such tilted anisotropy exchange springs [93], [94]. Zero field operation in CoFeB/MgO/CoFeB MTJs with tilted CoFeB free layers has been experimentally demonstrated [95].…”

Section: B Stno Materialsmentioning

confidence: 99%

Spin-Torque and Spin-Hall Nano-Oscillators

et al. 2016

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This paper reviews the state of the art in spin-torque and spin Hall effect driven nano-oscillators. After a brief introduction to the underlying physics, the authors discuss different implementations of these oscillators, their functional properties in terms of frequency range, output power, phase noise, and modulation rates, and their inherent propensity for mutual synchronization. Finally, the potential for these oscillators in a wide range of applications, from microwave signal sources and detectors to neuromorphic computation elements, is discussed together with the specific electronic circuitry that has so far been designed to harness this potential.

QS 2016

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“…While a fully perpendicular STNO, such as that assumed in the original prediction of droplets [40], would have the lowest nucleation current, it would on the other hand also not have any output signal, since the symmetry of the magnetodynamics would not generate a time-varying STNO resistance. Instead we argue that a fixed layer based on tilted anisotropy materials [51][52][53][54][55][56][57][58][59][60] would be ideal for droplet nucleation and operation. In Fig.…”

Section: Magnetic Droplet Nucleation Current Vs Fieldmentioning

confidence: 99%

Magnetic droplet solitons in orthogonal spin valves

Chung

Mohseni

Eklund

et al. 2015

Low Temperature Physics

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We review the recent experimental advancements in the realization and understanding of magnetic droplet solitons generated by spin transfer torque in orthogonal nanocontact based spin torque nanooscillators (STNOs) fabricated on extended spin valves and spin valve nanowires. The magnetic droplets are detected and studied using the STNO microwave signal and its resistance, the latter both quasistatically and time-resolved. The droplet nucleation current is found to have a minimum at intermediate magnetic field strengths and the nature of the nucleation changes gradually from a single sharp step well above this field, mode-hopping around the minimum, and continuous at low fields. The mode-hopping and continuous transitions are ascribed to droplet drift instability and re-nucleation at different time scales, which is corroborated by time-resolved measurements. We argue that the use of tilted anisotropy fixed layers could reduce the nucleation current further, move the nucleation current minimum to lower fields, and potentially remove the need for an applied magnetic field altogether. Finally, evidence of an edge mode droplet in a nanowire is presented. PACS: 75.30.Ds Spin waves;75.75.-c Magnetic properties of nanostructures.

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Spin wave excitations in exchange-coupled [Co/Pd]-NiFe films with tunable tilting of the magnetization

Cited by 27 publications

References 33 publications

Magnetic structure and anisotropy of[Co/Pd]5/NiFemultilayers

Magnetic structure and anisotropy of[Co/Pd]5/NiFemultilayers

Spin-Torque and Spin-Hall Nano-Oscillators

Magnetic droplet solitons in orthogonal spin valves

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