Conductivity-like damping in epitaxial Fe (Conference Presentation)

Khodadadi, Behrouz; Rai, Anish; Nepal, Bhuwan; Sapkota, Arjun; Srivastava, Abhishek; Mewes, Claudia; Budhathoki, Sujan; Hauser, Adam J.; Gao, Min; Li, Jiefang; Viehland, Dwight; Jiang, Zijian; Heremans, J. J.; Mewes, Tim; Emori, Satoru

doi:10.1117/12.2528426

Cited by 2 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In modern developments, this dynamic equation in both ferromagnets and antiferromagnets has been discussed based on the Lagrangian formalism by properly constructing the dissipation functional [45,46]. The microscopic mechanism of the Gilbert damping include the spin-orbit coupling [47][48][49][50][51], spin pumping [52][53][54], two-magnon scattering [55,56], etc.…”

Section: Preliminary Knowledge 21 Magnons 211 Magnetization Dynamics ...mentioning

confidence: 99%

Quantum magnonics: when magnon spintronics meets quantum information science

Yuan,

Cao,

Kamra

et al. 2021

Preprint

View full text Add to dashboard Cite

Spintronics and quantum information science are two promising candidates for innovating information processing technologies. The combination of these two fields enables us to build solid-state platforms for studying quantum phenomena and for realizing multi-functional quantum tasks. For a long time, however, the intersection of these two fields was limited due to the distinct properties of the classical magnetization, that is manipulated in spintronics, and quantum bits, that are utilized in quantum information science. This situation has changed significantly over the last few years because of the remarkable progress in coding and processing information using magnons. On the other hand, significant advances in understanding the entanglement of quasi-particles and in designing high-quality qubits and photonic cavities for quantum information processing provide physical platforms to integrate magnons with quantum systems. From these endeavours, the highly interdisciplinary field of quantum magnonics emerges, which combines spintronics, quantum optics and quantum information science. Here, we give an overview of the recent developments concerning the quantum states of magnons and their hybridization with mature quantum platforms. First, we review the basic concepts of magnons and quantum entanglement and discuss the generation and manipulation of quantum states of magnons, such as single-magnon states, squeezed states and quantum many-body states including Bose-Einstein condensation and the resulting spin superfluidity. We discuss how magnonic systems can be integrated and entangled with quantum platforms including cavity photons, superconducting qubits, nitrogen-vacancy centers, and phonons for coherent information transfer and collaborative information processing. The implications of these hybrid quantum systems for non-Hermitian physics and parity-time symmetry are highlighted, together with applications in quantum memories and high-precision measurements. Finally, we present an outlook on some of the challenges and opportunities in quantum magnonics.

show abstract

Section: Preliminary Knowledge 21 Magnons 211 Magnetization Dynamics ...mentioning

confidence: 99%

Quantum magnonics: when magnon spintronics meets quantum information science

Yuan,

Cao,

Kamra

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Temperature-dependent Gilbert damping was first observed in Fe 24 and later more systematically in Fe, Co and Ni. [25][26][27] A nonmonotonic temperature dependence has been found, for which a socalled "conductivitylike" component decreases with increasing temperature, usually at low temperatures, and a "resistivitylike" component increases with temperature, usually at high temperatures. This nonmonotonic behavior has been successfully described by the torquecorrelation model 28 and reproduced by first-principles computations.…”

Section: Introductionmentioning

confidence: 99%

“…The dimensionless Gilbert damping parameter α can be expressed in terms of a frequency λ via λ = αγM , 38 where M = |M| is the magnetization magnitude and γ is the gyromagnetic ratio. Despite of the different dimensions, these two parameters are equivalent 39 and both present in literature for experimental [24][25][26][27][35][36][37] and theoretical studies. 28,29,31,33,34,[40][41][42] In this study, we systematically investigate temperature-dependent Gilbert damping in singlelayer (SL) and bulk FGT using first-principles scattering theory.…”

Section: Introductionmentioning

confidence: 99%

Magnetic damping anisotropy in the two-dimensional van der Waals material Fe$_3$GeTe$_2$ from first principles

Yang,

Yuan,

Liu

2022

Preprint

View full text Add to dashboard Cite

Magnetization relaxation in the two-dimensional itinerant ferromagnetic van der Waals material, Fe3GeTe2, below the Curie temperature is fundamentally important for applications to low-dimensional spintronics devices. We use first-principles scattering theory to calculate the temperature-dependent Gilbert damping for bulk and single-layer Fe3GeTe2. The calculated damping frequency of bulk Fe3GeTe2 increases monotonically with temperature because of the dominance of resistivitylike behavior. By contrast, a very weak temperature dependence is found for the damping frequency of a single layer, which is attributed to strong surface scattering in this highly confined geometry. A systematic study of the damping anisotropy reveals that orientational anisotropy is present in both bulk and single-layer Fe3GeTe2. Rotational anisotropy is significant at low temperatures for both the bulk and a single layer and is gradually diminished by temperature-induced disorder. The rotational anisotropy can be significantly enhanced by up to 430% in gated single-layer Fe3GeTe2.

show abstract

Conductivity-like damping in epitaxial Fe (Conference Presentation)

Cited by 2 publications

References 0 publications

Quantum magnonics: when magnon spintronics meets quantum information science

Quantum magnonics: when magnon spintronics meets quantum information science

Magnetic damping anisotropy in the two-dimensional van der Waals material Fe$_3$GeTe$_2$ from first principles

Contact Info

Product

Resources

About