A Review of Modelling in Ferrimagnetic Spintronics

Barker, Joseph; Atxitia, Unai

doi:10.7566/jpsj.90.081001

Cited by 26 publications

(15 citation statements)

References 133 publications

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“…Possible future extensions include use of time quantization to allow study of, for example, field sweep rate on hysteresis loops, and grain reversal times. Finally, the method introduced here was applied to ferromagnetic materials, however a future work will investigate extensions to two-sublattice models, allowing applications to ferrimagnetic and antiferromagnetic materials [49].…”

Section: Discussionmentioning

confidence: 99%

Micromagnetic Monte Carlo method with variable magnetization length based on the Landau–Lifshitz–Bloch equation for computation of large-scale thermodynamic equilibrium states

Lepadatu

2021

Journal of Applied Physics

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An efficient method for computing thermodynamic equilibrium states at the micromagnetic length scale is introduced, based on the Markov chain Monte Carlo method.Trial moves include not only rotations of spins, but also a change in their magnetization length.The method is parameterized using the longitudinal susceptibility, reproduces the same Maxwell-Boltzmann distribution as the stochastic Landau-Lifshitz-Bloch equation, and is applicable both below and above the Curie temperature. The algorithm is fully parallel, can be executed on graphical processing units, and efficiently includes the long range dipolar interaction. This method is generally useful for computing finite-temperature relaxation states both for uniform and non-uniform temperature profiles, and can be considered as complementary to zero-temperature micromagnetic energy minimization solvers, with comparable computation time. However, unlike quasi-zero temperature approaches which do not take into account the magnetization length distribution and stochasticity, the method is better suited for structures with unbroken symmetry around the applied field axis, granular films, and at higher temperatures and fields. In particular, applications to finite-temperature hysteresis loop modelling, chiral magnetic thin films, granular magnetic media, and artificial spin ices are discussed.

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Section: Discussionmentioning

confidence: 99%

Micromagnetic Monte Carlo method with variable magnetization length based on the Landau–Lifshitz–Bloch equation for computation of large-scale thermodynamic equilibrium states

Lepadatu

2021

Journal of Applied Physics

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“…In a ferromagnet, magnons have a single + polarization (Figure 7a, subpanel i), while in a uniaxial AFM there are two magnon modes with + and − polarizations that are degenerated at zero field (Figure 7a, subpanel ii). In a ferrimagnet, both + and − polarized magnon modes exist due to the opposite sublattice moments which are split by the exchange field between the sublattices, and the − polarized mode has higher energy than the + one (134). In 2016, Geprägs et al (135) showed that SSE can be a measure of the magnon polarization.…”

Section: Sse As Probe Of Magnon Polarizationmentioning

confidence: 99%

Spin Seebeck Effect: Sensitive Probe for Elementary Excitation, Spin Correlation, Transport, Magnetic Order, and Domains in Solids

Kikkawa,

Saitoh

2022

Preprint

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The spin Seebeck effect (SSE) refers to the generation of a spin current as a result of a temperature gradient in a magnetic material, which can be detected electrically via the inverse spin Hall effect in a metallic contact. Since the discovery of SSE in 2008, intensive studies on SSE have been conducted to elucidate its origin. SSEs appear in a wide range of magnetic materials including ferro-, ferri-, and antiferro-magnets and also paramagnets with classical or quantum spin fluctuation. SSE voltage reflects fundamental properties of a magnet, such as elementary excitation, static magnetic order, spin correlation, and spin transport. In this article, we review recent progress on SSEs in various systems, with particular emphasis on its emerging role as a probe of these magnetic properties in solids. We also briefly discuss the recently-discovered nuclear SSE.

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“…PLEASE CITE THIS ARTICLE AS DOI: 10.1063/5.0073606 ferrimagnets are versatile platforms for exploring the physics and applications of pure spin currents in the absence of charge transport [2][3][4][5]. Of particular interest of all ferrimagnetic systems are the spin dynamics at ultrafast timescales, which are conveniently probed with laser-based optical techniques.…”

Section: Introductionmentioning

confidence: 99%

“…Hybridization between the rare-earth 5d states and the Fe, Co 3d electrons promotes anti-parallel alignment of the transition metal and Gd moments [2]. The net macroscopic moment can point either in the direction of the Gd or the Fe,Co moments, depending on which sublattice has the larger total moment.…”

Section: Introductionmentioning

confidence: 99%

Optical and extreme UV studies of spin dynamics in metallic and insulating ferrimagnets

Liu

Knut

Saha

et al. 2021

Journal of Applied Physics

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We present all-optical studies of spin dynamics in two classes of ferrimagnets. Both sets of experiments use table-top laser based pump-probe techniques to examine the ultrafast and longer timescale spin excitations. We use visible / near infra-red time-resolved magneto-optical Kerr effect (tr-MOKE) to follow the spin dynamics of a series of metallic (FeCo) 1−x Gd x thin films with varying Gd content. Magnetic compensation in the films occurs at a Gd concentration of ≈26% and the spin dynamics of the films exhibit a non-monotonic variation in effective magnetization.We also examine spin dynamics in an insulating NiFe 2 O 4 spinel using ultrafast techniques up at extreme ultraviolet energies, which permit element-specific investigations. The element and time-resolved delay scans reveal a non-trivial interaction between spin excitations on the different magnetic sub-lattices of the magnetic insulator.

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A Review of Modelling in Ferrimagnetic Spintronics

Cited by 26 publications

References 133 publications

Micromagnetic Monte Carlo method with variable magnetization length based on the Landau–Lifshitz–Bloch equation for computation of large-scale thermodynamic equilibrium states

Micromagnetic Monte Carlo method with variable magnetization length based on the Landau–Lifshitz–Bloch equation for computation of large-scale thermodynamic equilibrium states

Spin Seebeck Effect: Sensitive Probe for Elementary Excitation, Spin Correlation, Transport, Magnetic Order, and Domains in Solids

Optical and extreme UV studies of spin dynamics in metallic and insulating ferrimagnets

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