Spin Hall-induced auto-oscillations in ultrathin YIG grown on Pt

Evelt, M.; Safranski, Christopher; Aldosary, Mohammed; Demidov, V. E.; Barsukov, I.; Носов, А. П.; Ринкевич, А. Б.; Sobotkiewich, Kemal; Li, Xiaoqin; Shi, Jing; Krivorotov, I. N.; Demokritov, S. O.

doi:10.1038/s41598-018-19606-5

Cited by 46 publications

(30 citation statements)

References 37 publications

(39 reference statements)

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“…This observation is consistent with previous reports on similar structures. [ 37,38 ] At 2θ = 44.5° and 98.7°, peaks are observed that correspond to the Py layer with (111) texture, which is further indicative of high structural quality and epitaxial nature of the sample.…”

Section: Methodsmentioning

confidence: 98%

“…Four main Bragg peaks of YIG and GGG are observed: (220), (440), (660), and (880), which suggest the (110) growth orientation of the YIG layer. [ 37,38 ] At 2θ = 39.7°, a new peak is observed besides the YIG (440), which belongs to the 10 nm Pt layer with (111) texturing and finite thickness fringes associated with this peak are observed. This observation is consistent with previous reports on similar structures.…”

Section: Methodsmentioning

confidence: 99%

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Resonant Spin Transmission Mediated by Magnons in a Magnetic Insulator Multilayer Structure

et al. 2021

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While being electrically insulating, magnetic insulators can behave as good spin conductors by carrying spin current with excited spin waves. So far, magnetic insulators are utilized in multilayer heterostructures for optimizing spin transport or to form magnon spin valves for reaching controls over the spin flow. In these studies, it remains an intensively visited topic as to what the corresponding roles of coherent and incoherent magnons are in the spin transmission. Meanwhile, understanding the underlying mechanism associated with spin transmission in insulators can help to identify new mechanisms that can further improve the spin transport efficiency. Here, by studying spin transport in a magnetic‐metal/magnetic‐insulator/platinum multilayer, it is demonstrated that coherent magnons can transfer spins efficiently above the magnon bandgap of magnetic insulators. Particularly the standing spin‐wave mode can greatly enhance the spin flow by inducing a resonant magnon transmission. Furthermore, within the magnon bandgap, a shutdown of spin transmission due to the blocking of coherent magnons is observed. The demonstrated magnon transmission enhancement and filtering effect provides an efficient method for modulating spin current in magnonic devices.

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Section: Methodsmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%

Resonant Spin Transmission Mediated by Magnons in a Magnetic Insulator Multilayer Structure

et al. 2021

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“…The region of compensation of the intrinsic magnon damping rate is associated with the manifestation of auto-oscillation of the magnetic order parameter as described in the model of spin Hall nano-oscillators (SHNOs). [35,[182][183][184][185][186][187] This describes a coherent oscillation of magnetization that is dynamically sustained via spin-transfer torque at the NM/FMI interface. The theory for SHNOs utilizes a classical LandauÀLifshitzÀ Gilbert (LLG) model based on a macrospin and rate equations for an FMI/NM heterostructure.…”

Section: Charge Current-induced Compensation Of Magnon Dampingmentioning

confidence: 99%

All‐Electrical Magnon Transport Experiments in Magnetically Ordered Insulators

Althammer

2021

Physica Rapid Research Ltrs

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Angular momentum transport is one of the cornerstones of spintronics. Spin angular momentum is not only transported by mobile charge carriers but also by the quantized excitations of the magnetic lattice in magnetically ordered systems. In this regard, magnetically ordered insulators (MOIs) provide a platform for magnon spin transport experiments without additional contributions from spin currents carried by mobile electrons. In combination with charge‐to‐spin current conversion processes in conductors with finite spin–orbit coupling, it is possible to realize all‐electrical magnon transport schemes in thin‐film heterostructures. Herein, an insight into such experiments and recent breakthroughs achieved is provided. Special attention is given to charge‐current‐based manipulation via an adjacent normal metal of magnon transport in MOIs in terms of spin‐transfer torque. Moreover, the influence of two magnon modes with opposite spin in antiferromagnetic insulators on all‐electrical magnon transport experiments is discussed.

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“…Indeed, a FM/ NM bilayer SOT oscillator device is powered by electric current flowing in the plane of the bilayer. Such a current-in-plane (CIP) nano-device can be produced by means of a single e-beam lithography step followed by a single etching step 29 . In contrast, MTJbased oscillators are powered by electric current flowing perpendicular to the plane of the MTJ layers.…”

mentioning

confidence: 99%

Spin–orbit torque nano-oscillator with giant magnetoresistance readout

et al. 2020

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Spin-orbit torque nano-oscillators based on bilayers of ferromagnetic and nonmagnetic metals are ultra-compact current-controlled microwave signal sources. They are attractive for practical applications such as microwave assisted magnetic recording, neuromorphic computing, and chip-to-chip wireless communications. However, a major drawback of these devices is low output microwave power arising from the relatively small anisotropic magnetoresistance of the ferromagnetic layer. Here we experimentally show that the output power of a spin-orbit torque nano-oscillator can be significantly enhanced without compromising its structural simplicity. Addition of a ferromagnetic reference layer to the oscillator allows us to employ current-in-plane giant magnetoresistance to boost the output power of the device. This enhancement of the output power is a result of both large magnitude of giant magnetoresistance compared to that of anisotropic magnetoresistance and their different angular dependencies. Our results hold promise for practical applications of spin-orbit torque nano-oscillators.

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Spin Hall-induced auto-oscillations in ultrathin YIG grown on Pt

Cited by 46 publications

References 37 publications

Resonant Spin Transmission Mediated by Magnons in a Magnetic Insulator Multilayer Structure

Resonant Spin Transmission Mediated by Magnons in a Magnetic Insulator Multilayer Structure

All‐Electrical Magnon Transport Experiments in Magnetically Ordered Insulators

Spin–orbit torque nano-oscillator with giant magnetoresistance readout

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