Spin hydrodynamic generation

Takahashi, Ryo; Matsuo, Mamoru; Ono, Masato; Harii, Kiyonori; Chudo, Hiroyuki; Okayasu, Satoru; Ieda, Jun’ichi; Takahashi, Saburo; Maekawa, Sadamichi; Saitoh, Eiji

doi:10.1038/nphys3526

Cited by 162 publications

(145 citation statements)

References 26 publications

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“…Some metals could be added into the the liquid metal, and the composition of the self-limiting interfacial oxide, such as HfO 2 , Al 2 O 3 , andGd 2 O 3 . [141] Copyright 2015, Nature Publishing Group. a) The device configuration and working principle of the liquid-metal-based triboelectric nanogenerator.…”

Section: Two-dimensional (2d) Materialsmentioning

confidence: 99%

Preparations, Characteristics and Applications of the Functional Liquid Metal Materials

2017

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As new generation functional materials, the recently emerging low-melting liquid metals have displayed many unconventional properties superior to traditional materials. Various methods, such as alloying, oxidizing, adding metals, or non-metallic materials and so on, have been developed to prepare desirable functional materials based on the gallium or more other metals. These methods could not only change the form of the materials, but also endow the original liquid metals with rather diversified performances, which have further expanded the application range of the low-melting liquid metals to meet various needs. This article aims to review and summarize on the fabrication methods, characteristics, and applications of the functional liquid metal materials. Furthermore, the future outlook in this field, including challenges, routes, and related efforts, has also been illustrated and interpreted.

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Section: Two-dimensional (2d) Materialsmentioning

confidence: 99%

Preparations, Characteristics and Applications of the Functional Liquid Metal Materials

2017

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“…Hence, much attention is attracted by magnetization control using spin currents that can directly apply torque to magnetization by means of exchange interaction, without generating Ampere's magnetic field. At the moment, there are reports on experiments with spin current generation using centrifugal separation [16] and turbulent flows in liquid metals [17]. These methods cannot do without ferromagnetic materials with high spin polarization factor and nonmagnetic metals with strong spin-orbit interaction.…”

Section: Introductionmentioning

confidence: 99%

“…In this theory, generated spin current is proportional to metal's electric conductivity and spin relaxation time; therefore, metals with weak spin-orbit interaction such as Cu and Al are usable as spin current sources [15]. At the moment, there are reports on experiments with spin current generation using centrifugal separation [16] and turbulent flows in liquid metals [17]. However, these methods can be hardly applied to solid-state devices.…”

Section: Introductionmentioning

confidence: 99%

Excitation of Ferromagnetic Resonance Using Surface Acoustic Waves

Nozaki

Yanagisawa

2018

Electrical Engineering Japan

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Mechanical rotation of a crystal lattice in ferromagnetic materials can be energetically coupled with its magnetization via magnetoelastic coupling or spin rotation coupling. Surface acoustic wave (SAW) in piezoelectric materials is one of the promising candidates to realize the mechanical excitation of magnetization dynamics. In order to understand the mechanical rotation induced magnetization dynamics quantitatively, we examined the ferromagnetic resonance in an Ni film using a SAW in a LiNbO 3 substrate. By decreasing a period of interdigital transducer as short as 4 μm which is one-fifth of the previous work by Weiler [M. Weiler and co-workers, Elastically driven ferromagnetic resonance in Nickel thin films. Phys Rev Lett 106, 117601 (2011)], the fundamental frequency of SAW could be higher than 800 MHz. From the dependence of microwave absorption on the angle between the magnetization and the wave vector of SAW, it was confirmed that the Rayleigh type SAW, which was significant to obtain a large mechanical coupling with the magnetization, was dominantly excited in the 800-MHz-SAW device. C⃝ 2018 Wiley Periodicals, Inc. Electr Eng Jpn, 204(3): 3-9, 2018; Published online in Wiley Online Library (wileyonlinelibrary.com).

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“…The STAR collaboration [20] showed that the Quark Gluon Plasma has properties of nearly-perfect liquid with high vorticity. Takahashi et al [21] showed that fluid rotation itself can lead to spintronics and current generation without any magnetic fields, in what can be seen as a major result in informing us that the 'spin' of an electron could be due to what has been posited as circulation of the Spacetime Superfluid. At a greater scale, spacetime was recently found to have properties of a 'slippery superfluid' by Liberati and Maccione [22].…”

Section: A Motivationmentioning

confidence: 99%

Untitled

2018

Preprint

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Spin hydrodynamic generation

Cited by 162 publications

References 26 publications

Preparations, Characteristics and Applications of the Functional Liquid Metal Materials

Preparations, Characteristics and Applications of the Functional Liquid Metal Materials

Excitation of Ferromagnetic Resonance Using Surface Acoustic Waves

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