Distinct handedness of spin wave across the compensation temperatures of ferrimagnets

Kim, Chang-Soo; Lee, Soogil; Kim, Hyun Gyu; Park, Ji Ho; Moon, Kyung Woong; Park, Jae Yeol; Yuk, Jong Min; Lee, Kyung Jin; Park, Byong‐Guk; Kim, Se‐Kwon; Kim, Kab Jin; Hwang, Chanyong

doi:10.1038/s41563-020-0722-8

Cited by 56 publications

(26 citation statements)

References 37 publications

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“…Besides standard collinear AFs, there can be also more exotic variants considered for additional functionality, such as noncollinear AFs, chiral AFs, and 2D AF systems. Furthermore, FiMs can be designed to exhibit compensation at specific temperatures [137], allowing to combine FM and AF characteristics in a single temperature-controlled device.…”

Section: J Increasing the Signal Bandwidth -From Ferromagnetic To Ant...mentioning

confidence: 99%

Advances in Magnetics Roadmap on Spin-Wave Computing

et al. 2022

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Magnonics addresses the physical properties of spin waves and utilizes them for data processing. Scalability down to atomic dimensions, operation in the GHz-to-THz frequency range, utilization of nonlinear and nonreciprocal phenomena, and compatibility with CMOS are just a few of many advantages offered by magnons. Although magnonics is still primarily positioned in the academic domain, the scientific and technological challenges of the field are being extensively investigated, and many proof-of-concept prototypes have already been realized in laboratories. This roadmap is a product of the collective work of many authors that covers versatile spin-wave computing approaches, conceptual building blocks, and underlying physical phenomena. In particular, the roadmap discusses the computation operations with Boolean digital data, unconventional approaches like neuromorphic computing, and the progress towards magnon-based quantum computing. The article is organized as a collection of sub-sections grouped into seven large thematic sections. Each sub-section is prepared by one or a group of authors and concludes with a brief description of current challenges and the outlook of further development for each research direction.

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Section: J Increasing the Signal Bandwidth -From Ferromagnetic To Ant...mentioning

confidence: 99%

Advances in Magnetics Roadmap on Spin-Wave Computing

et al. 2022

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“…On the other hand, to utilize the antiferromagnetic dynamics, a method to overcome its lack of responsiveness to the external field needs to be devised. Compensated ferrimagnet, composed of two antiferromagnetically coupled sublattices [3], enables the fast dynamics of antiferromagnetic materials while having accessibility via external fields similar to ferromagnetic ones.…”

Section: Introductionmentioning

confidence: 99%

“…Unlike electric current mediated by the motion of charge carriers, the spin wave does not involve joule heating when propagating. Thus, it has high potential in the applications such as low-power computing devices [3]. However, a low damping constant is required to ensure a long transport distance for practical application.…”

Section: Introductionmentioning

confidence: 99%

Deposition of Crystalline GdIG Samples Using Metal Organic Decomposition Method

et al. 2022

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Fabrication of high quality ferrimagnetic insulators is an essential step for ultrafast magnonics, which utilizes antiferromagnetic exchange of the ferrimagnetic materials. In this work, we deposit high-quality GdIG thin films on a (111)-oriented GGG substrate using the Metal Organic Decomposition (MOD) method, a simple and high throughput method for depositing thin film materials. We postannealed samples at various temperatures and examined the effect on structural properties such as crystallinity and surface morphology. We found a transition in the growth mode that radically changes the morphology of the film as a function of annealing temperature and obtained an optimal annealing temperature for a uniform thin film with high crystallinity. Optimized GdIG has a high potential for spin wave applications with a low damping parameter in the order of 10−3, which persists down to cryogenic temperatures.

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“…In FIMs, spin dynamics breaks up into different branches well separated in frequency. For example, a two-sublattice FIM admits two dynamical modes of opposite chirality: a right-handed mode lying in the GHz frequency range and a left-handed mode lying in the THz frequency range [5][6][7]. When the low-frequency spin dynamics is excited, a FIM behaves just as an ordinary FM material as if the sublattice spins are locked together.…”

Section: Introductionmentioning

confidence: 99%

Manipulating Ferrimagnets by Fields and Currents

Guo,

Zhang,

Cheng

2021

Preprint

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Ferrimagnets (FIMs) can function as high-frequency antiferromagnets while being easy to detect as ferromagnets, offering unique opportunities for ultrafast device applications. While the physical behavior of FIMs near the compensation point has been widely studied, there lacks a generic understanding of FIMs where the ratio of sublattice spins can vary freely between the ferromagnetic and antiferromagnetic limits. Here we investigate the physical properties of a model two-sublattice FIM manipulated by static magnetic fields and current-induced torques. By continuously varying the ratio of sublattice spins, we clarify how the dynamical chiral modes in a FIM are intrinsically connected to their ferro-and antiferro-magnetic counterparts, which reveals unique features not visible near the compensation point. In particular, we find that current-induced torques can trigger spontaneous oscillation of the terahertz exchange mode. Compared with its realization in antiferromagnets, a spin-torque oscillator using FIMs not only has a reduced threshold current density but also can be self-stabilized, obviating the need for dynamic feedback.

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Distinct handedness of spin wave across the compensation temperatures of ferrimagnets

Cited by 56 publications

References 37 publications

Advances in Magnetics Roadmap on Spin-Wave Computing

Advances in Magnetics Roadmap on Spin-Wave Computing

Deposition of Crystalline GdIG Samples Using Metal Organic Decomposition Method

Manipulating Ferrimagnets by Fields and Currents

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