Magnon decay theory of Gilbert damping in metallic antiferromagnets

Simensen, Haakon T.; Kamra, Akashdeep; Troncoso, Roberto E.; Brataas, Arne

doi:10.1103/physrevb.101.020403

Cited by 17 publications

(9 citation statements)

References 93 publications

(110 reference statements)

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“…, where V is the volume of a unit cell, J is the strength of s−d coupling, and g(µ) is the density of states at the Fermi level µ [27]. This is consistent with the conclusions from the rigorous derivation and first-principles calculations that α n arises from spin-orbit coupling and α m is attributed to the exchange coupling with α n α m .…”

supporting

confidence: 86%

Recent progress in antiferromagnetic dynamics

Yuan¹,

Yuan²,

Duine³

et al. 2021

EPL

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Spintronics, since its inception, has mainly focused on ferromagnetic materials for manipulating the spin degree of freedom in addition to the charge degree of freedom, whereas much less attention has been paid to antiferromagnetic materials. Thanks to the advances of micro-nano-fabrication techniques and the electrical control of the Néel order parameter, antiferromagnetic spintronics is booming as a result of abundant room temperature materials, robustness against external fields and dipolar coupling, and rapid dynamics in the terahertz regime. For the purpose of applications of antiferromagnets, it is essential to have a comprehensive understanding of the antiferromagnetic dynamics at the microscopic level. Here, we first review the general form of equations that govern both antiferromagnetic and ferrimagnetic dynamics. This general form unifies the previous theories in the literature. We also provide a survey for the recent progress related to antiferromagnetic dynamics, including the motion of antiferromagnetic domain walls and skyrmions, the spin pumping and quantum antiferromagnetic spintronics. In particular, open problems in several topics are outlined. Furthermore, we discuss the development of antiferromagnetic quantum magnonics and its potential integration with modern information science and technology.perspective

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supporting

confidence: 86%

Recent progress in antiferromagnetic dynamics

Yuan¹,

Yuan²,

Duine³

et al. 2021

EPL

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“…Future devices, such as antiferromagnetic spin-torque oscillators, will greatly benefit from identifying materials that have low damping; theoretical progress is being made in this area. 153 From this standpoint, FeRh becomes an intriguing material. Magnetic damping in the ferromagnetic phase of FeRh has been reported, 154 and it is a relatively low damping material similar to permalloy.…”

Section: Dynamicsmentioning

confidence: 99%

Metallic antiferromagnets

Siddiqui¹,

Sklenar²,

Kang³

et al. 2020

Journal of Applied Physics

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Antiferromagnet materials have recently gained renewed interest due to their possible use in spintronics technologies, where spin transport is the foundation of their functionalities. In that respect metallic antiferromagnets are of particular interest, since they enable complex interplays between electronic charge transport, spin, optical, and magnetization dynamics. Here we review phenomena where the metallic conductivity provides unique perspectives for the practical use and fundamental properties of antiferromagnetic materials. II. CHARGE TRANSPORT IN METALLIC ANTIFERROMAGNETS A. MagnetoresistanceAnisotropic magnetoresistance (AMR) is a long-studied electrical property of ferromagnetic metals where resistivity depends upon the relative orientation between current and magnetization. 13 In spintronics research involving ferromag-arXiv:2005.05247v1 [cond-mat.str-el] 11 May 2020 state (see Fig. 1). In the Fe 2 O 3 /Pt bilayer system, intentional thermal annealing of the sample was used to distinguish two distinct types of switching in the magnetoresistance. A sawtooth magnetoresistance shape was attributed to the thermal artifact, while a smaller amplitude step-like change in the resistance was identified as antiferromagnetic switching. The implications of these new SMR switching experiments have not been fully reconciled yet with the earlier AMR switching experiments. Clearly, a future goal in the field of antiferromagnetic spintronics will be to identify and separate magnetoresistance effects arising from thermal or electromigration artifacts in both SMR and AMR based systems and devices.

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“…The current theoretical model employed shows that the switching time and energy both decrease by increasing the damping field. The switching protocol seems therefore most suitable for metallic antiferromagnets, where typically a strong magnon damping is found [58][59][60] . On the other hand, when the damping is weak, magnon-magnon interactions themselves will have a significant role on the damping of magnon-pair oscillations [61][62][63][64] , opening new avenues for all-coherent reversal between different oscillation modes at the quantum speed limit.…”

Section: Discussionmentioning

confidence: 99%

Parametrically driven THz magnon-pairs: predictions towards ultimately fast and minimally dissipative switching

Fabiani,

Mentink

2021

Preprint

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Magnon decay theory of Gilbert damping in metallic antiferromagnets

Cited by 17 publications

References 93 publications

Recent progress in antiferromagnetic dynamics

Recent progress in antiferromagnetic dynamics

Metallic antiferromagnets

Parametrically driven THz magnon-pairs: predictions towards ultimately fast and minimally dissipative switching

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