Depth-Resolved Magnetization Dynamics Revealed by X-Ray Reflectometry Ferromagnetic Resonance

Burn, D. M.; Zhang, S. L.; Yu, Guoqiang; Yuan, Guang; Chen, H. J.; Qiu, Xuepeng; Laan, G. van der; Hesjedal, T.

doi:10.1103/physrevlett.125.137201

Cited by 24 publications

(10 citation statements)

References 28 publications

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“…For three-dimensional systems with nonuniform χ(z), the measured CD-REXS intensity, I m , is thus averaged over all depths with a particular weighing factor b(z), which is depth-dependent. 22,42 I m can be written as…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…In other words, the rotation angle of the extinction vector uniquely reveals the χ value, as illustrated by the look-up tables in the Supplementary Figures S4 and S5. For three-dimensional systems with nonuniform χ( z ), the measured CD-REXS intensity, I m , is thus averaged over all depths with a particular weighing factor b ( z ), which is depth-dependent. , I m can be written as where b ( z ) = e –2 z sec α/Λ( ℏω ) /Λ( ℏω ), Λ is the X-ray penetration length which is a function of photon energy ℏω , and α is the incident angle with respect to the surface normal. It can be seen from eq that I m (Ψ) also takes a sinusoidal profile with a half-positive–half-negative CD pattern, from which one can identify a distinct extinction vector, and an associated χ m value .…”

Section: Resultsmentioning

confidence: 99%

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Axially Bound Magnetic Skyrmions: Glueing Topological Strings Across an Interface

et al. 2022

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A major challenge in topological magnetism lies in the three-dimensional (3D) exploration of their magnetic textures. A recent focus has been the question of how 2D skyrmion sheets vertically stack to form distinct types of 3D topological strings. Being able to manipulate the vertical coupling should therefore provide a route to the engineering of topological states. Here, we present a new type of axially bound magnetic skyrmion string state in which the strings in two distinct materials are glued together across their interface. With quasi-tomographic resonant elastic Xray scattering, the 3D skyrmion profiles before and after their binding across the interface were unambiguously determined and compared. Their attractive binding is accompanied by repulsive twisting; i.e., the coupled skyrmions mutually affect each other via a compensating twisting. This state exists in chiral magnet−magnetic thin film heterostructures, providing a new arena for the engineering of 3D topological phases.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Axially Bound Magnetic Skyrmions: Glueing Topological Strings Across an Interface

et al. 2022

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“…However, the studies so far only focus on the electrical signature of skyrmionic textures in quasi-two-dimensional systems. Deeper understandings of the signature of skyrmionic textures in magnetic multilayers must necessarily consider i) the coupling of skyrmions across layers [28,29], ii) the depthresolved dynamics of complex spin textures [7,30], and iii) the correlation between the underlying variation of the TH signal and Bloch-point dynamics especially when the integrity of single skyrmions is broken [31], in which case more fundamental studies are essential.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Bloch-point hopping in multilayer skyrmions and associated emergent electromagnetic signatures

Li,

Mankovsky,

Polesya

et al. 2021

Preprint

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Magnetic multilayers are promising tuneable systems for hosting magnetic skyrmions at/above room temperature. Revealing their intriguing switching mechanisms and associated inherent electrical responses are prerequisites for developing skyrmionic devices. In this work, we theoretically demonstrate the annihilation of single skyrmions occurring through a multilayer structure, which is mediated by hopping dynamics of topological hedgehog singularities known as Bloch points. The emerging intralayer dynamics of Bloch points are dominated by the Dzyaloshinskii-Moriya interaction, and their propagation can give rise to solenoidal emergent electric fields in the vicinity. Moreover, as the topology of spin textures can dominate their emergent magnetic properties, we show that the Bloch-point hopping through the multilayer will modulate the associated topological Hall response, with the magnitude proportional to the effective topological charge. We also investigate the thermodynamic stability of these states regarding the layer-dependent magnetic properties. This study casts light on the emergent electromagnetic signatures of skyrmion-based spintronics, rooted in magnetic-multilayer systems.

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“…Magnetization dynamics of the ferromagnet, including precession and nutation motions, have been observed in thin films using ferromagnetic resonance [36,37]. Such dynamics occur on picosecond time scales, until the intrinsic spins relax to an equilibrium state.…”

Section: Introductionmentioning

confidence: 99%

Ferromagnetic Gyroscopes for Tests of Fundamental Physics

Fadeev,

Timberlake,

Wang

et al. 2020

Preprint

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A ferromagnetic gyroscope (FG) is a ferromagnet whose angular momentum is dominated by electron spin polarization and that will precess under the action of an external torque, such as that due to a magnetic field. Here we model and analyze FG dynamics and sensitivity, focusing on practical schemes for experimental realization. In the case of a freely floating FG, we model the transition from dynamics dominated by libration in relatively high externally applied magnetic fields, to those dominated by precession at relatively low applied fields. Measurement of the libration frequency enables in situ measurement of the magnetic field and a technique to reduce the field below the threshold for which precession dominates the FG dynamics. We note that evidence of gyroscopic behavior is present even at magnetic fields much larger than the threshold field below which precession dominates. We also model the dynamics of an FG levitated above a type-I superconductor via the Meissner effect, and find that for FGs with dimensions larger than about 100 nm the observed precession frequency is reduced compared to that of a freely floating FG. This is akin to negative feedback that arises from the distortion of the field from the FG by the superconductor. Finally we assess the sensitivity of an FG levitated above a type-I superconductor to exotic spin-dependent interactions under practical experimental conditions, demonstrating the potential of FGs for tests of fundamental physics.

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Depth-Resolved Magnetization Dynamics Revealed by X-Ray Reflectometry Ferromagnetic Resonance

Cited by 24 publications

References 28 publications

Axially Bound Magnetic Skyrmions: Glueing Topological Strings Across an Interface

Axially Bound Magnetic Skyrmions: Glueing Topological Strings Across an Interface

Magnetic Bloch-point hopping in multilayer skyrmions and associated emergent electromagnetic signatures

Ferromagnetic Gyroscopes for Tests of Fundamental Physics

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