Suppression of Skyrmion Hall Motion in Antiferromagnets Driven by Circularly Polarized Spin Waves

An investigation of spin waves interacting with antiferromagnetic spin textures is meaningful for future spintronic and magnonic-based memory and logic applications. In this work, we numerically study the skyrmion dynamics driven by circularly polarized spin waves in antiferromagnets and propose a method of suppressing the Hall motion. It is demonstrated that the application of two circularly polarized spin waves with opposite chirality allows the skyrmion motion straightly along the intersection line of the two spin wave sources. The skyrmion speed depending on these parameters of the spin waves and system is estimated, and a comparison with other methods is provided. Furthermore, two depinning behaviors of the skyrmion related to the strengths of the defect are also observed in the simulations. Thus, the proposed method could be used in precisely modulating the skyrmion dynamics, contributing to skyrmion-based memory device design.

Download Full-text

Theoretical aspects of magnon–magnon interactions in Heisenberg ferromagnets

Canadian Journal of Physics ◽

10.1139/p87-202 ◽

1987 ◽

Vol 65 (10) ◽

pp. 1272-1279 ◽

Cited By ~ 5

Author(s):

P. D. Loly

Keyword(s):

Low Temperature ◽

Spin Wave ◽

Low Temperatures ◽

Theoretical Foundation ◽

Weak Interactions ◽

Spin Waves ◽

Wave Interactions ◽

Experimental Activity ◽

Close Proximity ◽

Antiferromagnetic Spin

Spin-wave interactions in ferromagnetic insulators have a well-established theoretical foundation, in contrast to the situation for antiferromagnets. These interactions may be classified into two groups according to whether the dominant aspects are of one- or two-magnon character. The weak interactions between spin waves excited at low temperatures are responsible for the success of "free" (or noninteracting) spin-wave calculations in explaining low-temperature thermodynamic properties. In contrast, the two-magnon aspects appear in connection with two-magnon Raman scattering, where pairs of magnons are created in close proximity and consequently interact strongly. Parallels with analogous systems, especially antiferromagnetic spin waves and phonons, are noted in reviewing the ferromagnetic case. Emphasis is placed on the structure of the theory, rather than on the wealth of experimental activity.

Download Full-text

A NEW MECHANISM OF HIGH Tc SUPERCONDUCTIVITY BY ANTIFERROMAGNETIC SPIN WAVES

Modern Physics Letters B ◽

10.1142/s0217984987000454 ◽

1987 ◽

Vol 01 (07n08) ◽

pp. 315-321 ◽

Cited By ~ 3

Author(s):

KIYOSHI SOGO

Keyword(s):

Critical Temperature ◽

Spin Wave ◽

Spin Waves ◽

Coupling Constant ◽

High Critical Temperature ◽

High Tc ◽

High Tc Superconductivity ◽

Mechanism Of Superconductivity ◽

Antiferromagnetic Spin

New mechanism of superconductivity is presented, which utilizes antiferromagnetic spin waves. It is found that for the case of Ising like anisotropy the spin wave coherence strongly enhances the superconductive coupling constant, which gives rise to a rather high critical temperature. Sloppy spin wave mechanism is also suggested.

Download Full-text

The investigation of Neutron Scattering In Spin Waves Theory of Ferromagnetic Crystals

Malaysian Journal of Fundamental and Applied Sciences ◽

10.11113/mjfas.v8n4.151 ◽

2014 ◽

Vol 8 (4) ◽

Author(s):

Azadeh Farzaneh ◽

Mohammad Reza Abdi ◽

Khadije Rezaee Ebrahim Saraee

Keyword(s):

Neutron Scattering ◽

Spin Wave ◽

Cross Section ◽

Inelastic Neutron Scattering ◽

Spin Waves ◽

Wave Theory ◽

Spin Correlation ◽

Inelastic Neutron ◽

Magnetic Behaviour ◽

Spin Interaction

Inelastic neutron scattering, probing the temporal spin-spin correlation at the different microscopic scale, is a powerful technique to study the magnetic behaviour of ferromagnetic crystals. In addition, high penetration power of neutron in samples has made it as a useful way for spin-spin interaction in neutron scattering. Changes in the magnetic cross section in term of different energy transfer and temperatures are calculated for nickel and iron as transition metals in Heisenberg model versus spin wave theory by considering atomic form factor. Finally, the effect of magnetic structure and behaviour of crystal in measuring cross-section shows that increasing temperature results in the Cross-section increase Also, the existence of propagating spin waves below Tc is compared in Ni and Fe in different momentum transfers. The relation of spin wave energy with temperature dependence of nickel has created different behaviour in the changes of cross section rather than iron.

Download Full-text

Spin-Wave Dynamics in Antiferromagnets under Electric Current

10.7566/jpsht.1.067 ◽

2021 ◽

Vol 1 ◽

Keyword(s):

Electric Current ◽

Spin Wave ◽

Doppler Effect ◽

Spin Waves ◽

Microscopic Analysis ◽

Spin Transfer Torque ◽

Spin Transfer ◽

Wave Dynamics

Electric current causes a Doppler effect in spin waves in ferromagnets through a spin-transfer torque. We report that antiferromagnets allow two such spin-transfer torques and present a microscopic analysis that interpolates ferro- and antiferromagnetic transport regimes.

Download Full-text

Bi-reflection of spin waves

Communications Physics ◽

10.1038/s42005-020-00455-6 ◽

2020 ◽

Vol 3 (1) ◽

Author(s):

Tomosato Hioki ◽

Yusuke Hashimoto ◽

Eiji Saitoh

Keyword(s):

Spin Wave ◽

Elastic Waves ◽

Light Wave ◽

Incident Angle ◽

Spin Waves ◽

Time Resolved ◽

Reflected Light ◽

Sample Edge ◽

Out Of Plane ◽

Angle Of Reflection

Abstract When a light wave is refracted at a boundary between two different media, it may split into two rays due to optical anisotropy, a phenomenon called birefringence. On the other hand, for a reflected light wave in an ordinary medium, the angle of reflection is always the same as the incident angle as expected from the law of reflection. Here, we report the observation of a split of reflected spin-waves, or bi-reflection of spin-waves, where a spin-wave refers to a wavy motion of electron spins in a magnetic material. We measured the spin-wave propagation in a magnetic garnet Lu2Bi1Fe3.4Ga1.6O12 by using time-resolved magneto-optical microscopy and found that the spin-wave splits in two as a result of reflection at the sample edge of an out-of-plane magnetized film. Systematic measurements combined with calculations unveiled that the bi-reflection is due to the hybridization with elastic waves.

Download Full-text

Robust antiferromagnetic spin waves across the metal-insulator transition in hole-doped BaMn2As2

Physical Review B ◽

10.1103/physrevb.95.224401 ◽

2017 ◽

Vol 95 (22) ◽

Cited By ~ 5

Author(s):

M. Ramazanoglu ◽

A. Sapkota ◽

Abhishek Pandey ◽

J. Lamsal ◽

D. L. Abernathy ◽

...

Keyword(s):

Spin Waves ◽

Insulator Transition ◽

Metal Insulator Transition ◽

Metal Insulator ◽

Antiferromagnetic Spin

Download Full-text

The theory of the ferromagnetism of conduction electrons at low temperatures

Proceedings of the Royal Society of London Series A - Mathematical and Physical Sciences ◽

10.1098/rspa.1965.0072 ◽

1965 ◽

Vol 284 (1398) ◽

pp. 423-441 ◽

Cited By ~ 11

Keyword(s):

Low Temperature ◽

Spin Wave ◽

Single Particle ◽

Lattice Site ◽

Spontaneous Magnetization ◽

Spin Waves ◽

Green Functions ◽

Linear Combinations ◽

Conduction Electrons ◽

Occupation Numbers

A theory is presented in which the effect of spin waves on the single-particle states of conduction electrons is obtained as well as the effect of the conduction electrons on the spin waves. Green function techniques are employed. The Hamiltonian is taken to contain the single-particle energies of the conduction electrons in the absence of interactions, the Coulomb interaction between electrons in Wannier states centred on the same lattice site C , and the interatomic exchange terms J ij . Interband integrals are neglected. The chain of equations for the single-particle Green functions is decoupled in such a way as to include the effects of the spin waves in the single-particle Green functions. The theory is worked out on the assumption that C is very much greater than the band width and the J ij so that at T ═ 0 the double occupation of Wannier orbital states is the minimum possible. The resulting single-particle occupation numbers are linear combinations of Fermi-Dirac functions. The low temperature spontaneous magnetization ξ is found to be a product of a spin-wave magnetization and a single-particle magnetization ξ s.p ., and so contains terms varying as T 1 and T 1 , and T 2 if both spin sub-bands are partially occupied in the ground state. The low temperature specific heat contains T and T 1 terms. The results of the Heisenberg model are obtained in the appropriate limit. Expressions for the spin-wave energy and its temperature dependence are discussed.

Download Full-text