Control of propagating spin waves via spin transfer torque in a metallic bilayer waveguide

An, Kay Hyeok; Birt, Daniel R.; Pai, Chi‐Feng; Olsson, Kevin; Ralph, Daniel; Buhrman, R. A.; Li, Xiaoqin

doi:10.1103/physrevb.89.140405

Cited by 60 publications

(48 citation statements)

References 32 publications

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“…The damping of the fundamental mode could be completely compensated by the SOT, and coherent auto‐oscillation was achieved . Tuning of the spin‐wave damping and SOT‐induced auto‐oscillation has also been achieved in ferromagnetic metallic multilayers Ta/CoFeB and Pt/NiFe …”

Section: Manipulation Of Magnetic Materials By Spin–orbit Torquesmentioning

confidence: 89%

Manipulation of Magnetization by Spin–Orbit Torque

Edmonds

Liu

et al. 2018

Adv Quantum Tech

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The control of magnetization by electric current is a rapidly developing area motivated by a strong synergy between breakthrough basic research discoveries and industrial applications in the fields of magnetic recording, magnetic field sensors, spintronics, and nonvolatile memories. In recent years, the discovery of spin–orbit torque has opened a spectrum of opportunities to manipulate the magnetization efficiently. This article presents a review of the historical background and recent literature focusing on spin–orbit torques (SOTs), highlighting the most exciting new scientific results and suggesting promising future research directions. It starts with an introduction and overview of the underlying physics of spin–orbit coupling effects in bulk and at interfaces, and then describes the use of SOTs to control ferromagnets and antiferromagnets. Finally, the prospects for the future development of spintronic devices based on SOTs are summarized.

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Section: Manipulation Of Magnetic Materials By Spin–orbit Torquesmentioning

confidence: 89%

Manipulation of Magnetization by Spin–Orbit Torque

Edmonds

Liu

et al. 2018

Adv Quantum Tech

View full text Add to dashboard Cite

show abstract

“…In the context of a phase-conserving, mode-and frequency-selective amplification of traveling spin waves, the process of parallel pumping has, so far, proven superior to other approaches of spin-wave amplification, such as the reduction of the spin-wave damping by spin transfer torque (STT) [24][25][26][27]. Parallel pumping, or parallel parametric amplification, results from the interaction of selected spin waves with a sufficiently large dynamic effective magnetic field, which acts in parallel to the static magnetization and features two times the frequency of these spin waves.…”

Section: Introductionmentioning

confidence: 99%

Parallel pumping for magnon spintronics: Amplification and manipulation of magnon spin currents on the micron-scale

2017

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Magnonics and magnon spintronics aim at the utilization of spin waves and magnons, their quanta, for the construction of wave-based logic networks via the generation of pure all-magnon spin currents and their interfacing with electrical charge transport. The promise of efficient parallel data processing and low power consumption renders this field one of the most promising research areas in spintronics. In this context, the process of parallel parametric amplification, i.e., the conversion of microwave photons into magnons at one half of the microwave frequency, has proven to be a versatile tool to excite and to manipulate spin waves. Its beneficial and unique properties such as frequency and mode-selectivity, the possibility to excite spin waves in a wide wavevector range and the creation of phase-correlated wave pairs, have enabled the achievement of important milestones like the magnon Bose Einstein condensation and the cloning and trapping of spinwave packets. Parallel parametric amplification, which allows for the selective amplification of magnons while conserving their phase is, thus, one of the key methods of spin-wave generation and amplification.The application of parallel parametric amplification to CMOS-compatible micro-and nanostructures is an important step towards the realization of magnonic networks. This is motivated not only by the fact that amplifiers are an important tool for the construction of any extended logic network but also by the unique properties of parallel parametric amplification. In particular, the creation of phase-correlated wave pairs allows for rewarding alternative logic operations such as a phase-dependent amplification of the incident waves. Recently, the successful application of parallel parametric amplification to metallic microstructures has been reported which constitutes an important milestone for the application of magnonics in practical devices. It has been demonstrated that parametric amplification provides an excellent tool to generate and to amplify spin waves in these systems in a wide wavevector range. In particular, the amplification greatly benefits from the discreteness of the spin-wave spectra since the size of the microstructures is comparable to the spin-wave wavelength. This opens up new, interesting routes of spin-wave amplification and manipulation. In this Review, we will give an overview over the recent developments and achievements in this field.

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“…The Curie temperatures of these materials are 560 K for YIG, and 550K to 870K for Py depending on the crystal structure 20,21 . BLS spectra are collected using a µBLS system, briefly described as follows 12,19,22 . A single frequency, linearly polarized 532 nm laser beam, normally incident on the sample, is focused using an objective lens (NA 0.70) to a spot size of approximately 1 µm in diameter.…”

mentioning

confidence: 99%

Control of propagating spin waves via spin transfer torque in a metallic bilayer waveguide

Cited by 60 publications

References 32 publications

Manipulation of Magnetization by Spin–Orbit Torque

Manipulation of Magnetization by Spin–Orbit Torque

Parallel pumping for magnon spintronics: Amplification and manipulation of magnon spin currents on the micron-scale

Temperature-dependent Brillouin light scattering spectra of magnons in yttrium iron garnet and permalloy

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