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A method to control the transmission of spin waves

A spin wave and waveguide technology, applied in the field of spin wave transmission control, can solve problems such as high energy consumption, low system reliability, and complex design, and achieve low power efficiency, promote compatibility, and reduce complexity.

Active Publication Date: 2019-01-04
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a spin wave transmission control method based on an electric field. By applying an electric field, the intensity of the internal exchange interaction of the magnetic waveguide material is adjusted, and then the dispersion relationship of the spin wave is adjusted to realize the control of the spin wave. Precise control of the electric field of the rotary wave transmission, thereby solving the technical problems of complex design, high energy consumption and low system reliability existing in traditional magnetic field control methods

Method used

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  • A method to control the transmission of spin waves
  • A method to control the transmission of spin waves
  • A method to control the transmission of spin waves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]This embodiment reveals the change law of the exchange interaction strength of the magnetic waveguide under the action of the electric field along the normal direction of the waveguide plane through the first principle calculation.

[0035] The calculation uses a model such as image 3 As shown in (a), it is 3 layers of bcc Fe(001) atomic layers, and its vacuum layer thickness is The electric field along the c-axis direction is introduced by the dipole layer method, and the applied electric field strength ranges from -5V / nm to 5V / nm. The calculations are based on the first-principles VASP software package, and the exchange integral J is derived from the energy difference between the antiferromagnetic and ferromagnetic states.

[0036] To simplify the description, the image 3 The iron atoms in (a) are marked as 1, 2, 3 from left to right. Considering only the nearest neighbor exchange interaction, the ferromagnetic state energy E can be obtained F and the antiferrom...

Embodiment 2

[0046] This example reveals the influence of the electric field modulation exchange effect on the spin wave transmission, the corresponding change law of the spin wave number, phase velocity, and wavelength through micromagnetic simulation, and proves the feasibility of using the electric field to regulate the exchange constant to control the spin wave transmission.

[0047] The simulation is carried out using the OOMMF software package based on the LLG equation, and the calculation especially considers the effect of the electric field modulation exchange interaction:

[0048]

[0049] in is the normalized magnetization vector, M s is the saturation magnetization, α is the Gilbert attenuation factor, and γ is the Gilbert gyromagnetic ratio. is the effective field, including Heisenberg exchange field, magnetic anisotropy field, demagnetizing field and applied bias field, which can be expressed as:

[0050]

[0051] where the exchange constant is electric field depen...

Embodiment 3

[0063] The bias magnetic field is along the x direction in the plane, and the others are the same as in Embodiment 2. The results show that the dispersion relationship of the reverse body wave can be effectively adjusted by modulating the exchange interaction intensity by an external electric field, and the wave number, phase velocity, wavelength and group velocity of the spin wave can be effectively adjusted, so the external electric field can effectively control the reverse body wave transmission.

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Abstract

The invention discloses a method for controlling spin wave transmission, which belongs to the field of spin electronics. The method can effectively change the intensity of exchange interaction inside the magnetic waveguide material by applying an electric field on the spin wave waveguide structure. Controlling the exchange constant by the electric field can achieve the purpose of regulating the dispersion relationship of the spin wave and then controlling the transmission of the spin wave. The invention controls the exchange action by the electric field, can realize the local precise control of the spin wave transmission with ultra-low power consumption, and provides the possibility for the practical application of the ultra-low power consumption and CMOS process compatible magnetotronics device.

Description

technical field [0001] The invention belongs to the technical field of spin electronics, and more specifically relates to a method for controlling spin wave transmission. Background technique [0002] With its unique advantages, magnonics is recognized as the most potential information transmission and processing technology in the post-COMS era. In magnononics, it is the collective precession of electron spins, or spin waves, rather than dissipative charge movement that carries the information. In principle, magnons (quanta of spin waves) allow the transmission and processing of information without moving any physical particles, and thus without Joule heat dissipation. In magnonics, information can be encoded in the amplitude and phase of spin waves, so the effective control of spin wave propagation becomes the core of promoting the practical application of magnonics. In recent years, a large number of logic devices based on the amplitude or phase of spin waves have emerge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L43/12H10N50/01
CPCH10N50/01
Inventor 程晓敏王升关夏威连晨黄婷缪向水
Owner HUAZHONG UNIV OF SCI & TECH