Mode conversion from quantized to propagating spin waves in a rhombic antidot lattice supporting spin wave nanochannels

2012 ◽  
Vol 86 (1) ◽  
Author(s):  
S. Tacchi ◽  
B. Botters ◽  
M. Madami ◽  
J. W. Kłos ◽  
M. L. Sokolovskyy ◽  
...  
Keyword(s):  
Spin Wave ◽  
Mode Conversion ◽  
Spin Waves

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

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.

Spin-Wave Dynamics in Antiferromagnets under Electric Current

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.

scholarly journals Bi-reflection of spin waves

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.

The theory of the ferromagnetism of conduction electrons at low temperatures

1965 ◽  
Vol 284 (1398) ◽  
pp. 423-441 ◽  
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.

scholarly journals Theory of Spin Waves in the Heavy Rare Earth Metals

1971 ◽  
Vol 49 (9) ◽  
pp. 1137-1161 ◽  
Author(s):  
D. A. Goodings ◽  
B. W. Southern
Keyword(s):  
Rare Earth ◽  
Spin Wave ◽  
Equations Of Motion ◽  
Rare Earth Metals ◽  
Spin Waves ◽  
Random Phase ◽  
Wave Interaction ◽  
Exchange Interactions ◽  
Special Cases ◽  
Anisotropic Exchange

A theory of spin waves for the spin structures found in the rare earth metals of h.c.p. crystal structure is described. The theory is developed for the conical spiral spin structure which contains the planar spiral, the nonplanar ferromagnet, and the planar ferromagnet as special cases. Included in the Hamiltonian are isotropic and anisotropic exchange interactions, single-ion crystal field terms, and magnetoelastic terms, both of the single-ion type (linear in the strains and up to fourth order in the spin operators) and of the two-ion type (linear in the strains and second order in the spin operators). The magnetoelastic effects are discussed in considerable detail, both in the "frozen lattice approximation" and in the opposite limit in which the strains closely follow the motion of the (uniformly) processing spins. Equations of motion for the spin operators are linearized with the help of the random phase approximation which makes it possible to express some spin-wave interaction effects in terms of powers of the reduced magnetization. Expressions for the spin-wave energies are given for the planar spiral, the nonplanar ferromagnet, and the planar ferromagnet, taking advantage of the simplifying features in each case.

scholarly journals Spin Waves in One Dimensional Magnetic Material

2015 ◽  
Vol 47 ◽  
pp. 24-39
Author(s):  
H.S. Wijesinhe ◽  
K.A.I.L. Wijewardena Gamalath
Keyword(s):  
Spin Wave ◽  
Numerical Solutions ◽  
Dynamic Properties ◽  
Equations Of Motion ◽  
Spin Waves ◽  
Dynamic Structure ◽  
Three Dimensions ◽  
Spin Interaction ◽  
Operator Representation ◽  
One Dimensional

Using Heisenberg model, the equations of motion for the dynamic properties of spin waves in three dimensions were obtained and solved analytically up to an exponential operator representation. Second order Suzuki Trotter decomposition method with evolution operator solution was applied to obtain the numerical solutions by making it closer to real spin systems. Computer based simulations on systems in micro canonical ensembles in constant-energy states were used to check the applicability of this model for one dimensional lattice by investigating the occurrence, temperature dependence and spin-spin interaction dependence of the spin waves. A visualization technique was used to show the existence of many spin wave components below the Curie temperature of the system. In the magnon dispersion curves all or most of the spin wave components could be recognized as peaks in the dynamic structure factor. Energy conservation of the algorithm is also shown.

scholarly journals Accumulation and Control of Spin Waves in Magnonic Dielectric Microresonators by a Comb of Ultrashort Laser Pulses

2021 ◽  
Author(s):  
A. E. Khramova ◽  
M. Kobecki ◽  
I. A. Akimov ◽  
I. V. Savochkin ◽  
M. A. Kozhaev ◽  
...  
Keyword(s):  
Spin Wave ◽  
Repetition Rate ◽  
Spin Waves ◽  
Small Variation ◽  
Laser Pulses ◽  
High Repetition Rate ◽  
Ultrashort Laser Pulses ◽  
Additional Degree ◽  
Light Pulses ◽  
Iron Garnet

Abstract Spin waves in magnetic microresonators are at the core of modern magnonics. Here we demonstrate a new method of tunable excitation of different spin wave modes in magnetic microdisks by using a train of laser pulses coming at a repetition rate higher than the decay rate of spin precession. The microdisks are etched in a transparent bismuth iron garnet film and the light pulses influence the spins nonthermally through the inverse Faraday effect. The high repetition rate of the laser stimulus of 10 GHz establishes an interplay between the spin wave resonances in the frequency and momentum domains. As a result, the excitation efficiency of different spin modes can be tuned by a small variation of the external magnetic field. An additional degree of freedom is provided by scanning the laser spot within the microdisk area. This makes the proposed method for spin wave excitation advantageous for the forthcoming application of magnonics for telecommunication and quantum technologies.

scholarly journals Interfacial Dzialoshinskii–Moriya interaction induced nonreciprocity of spin waves in magnonic waveguides

RSC Advances ◽  
2014 ◽  
Vol 4 (87) ◽  
pp. 46454-46459 ◽  
Author(s):  
Fusheng Ma ◽  
Yan Zhou
Keyword(s):  
Wave Propagation ◽  
Spin Wave ◽  
Spin Waves ◽  
Moriya Interaction

Nonreciprocal spin wave propagation in magnonic waveguides with the presence of interfacial Dzialoshinskii–Moriya interaction: different frequencies, amplitudes, and mode profiles.

scholarly journals Quantum Spin-Wave Materials, Interface Effects and Functional Devices for Information Applications

2020 ◽  
Vol 7 ◽  
Author(s):  
Jiapeng Xu ◽  
Lichuan Jin ◽  
Zhimin Liao ◽  
Qi Wang ◽  
Xiaoli Tang ◽  
...  
Keyword(s):  
Power Consumption ◽  
Spin Wave ◽  
Spin Waves ◽  
Quantum Spin ◽  
Spin Torque ◽  
Material System ◽  
Garnet Films ◽  
Wave Effects ◽  
Technical Issues ◽  
High Power Consumption

With the continuous miniaturization of electronic devices and the increasing speed of their operation, solving a series of technical issues caused by high power consumption has reached an unprecedented level of difficulty. Fortunately, magnons (the quanta of spin waves), which are the collective precession of spins in quantum magnetic materials, making it possible to replace the role of electrons in modern information applications. In the process of information transmission, nano-sized spin-wave devices do not transport any physical particles; therefore, the corresponding power consumption is extremely low. This review focuses on the emerging developments of the spin-wave materials, tunable effects, and functional devices applications. In the materials front, we summarize the magnetic properties and preparation characteristics of typical insulating single-crystalline garnet films or metallic alloy films, the development of new spin-wave material system is also introduced. Afterward, we introduce the emerging electric control of spin-wave effects originating from the interface transitions, physical or chemical, among these films including, voltage-controlled magnetic anisotropy, magneto-ionic transport, electric spin-torque, and magnon-torque. In the functional devices front, we summarize and elaborate on the low dispassion information processing devices and sensors that are realized based on spin waves.

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