CN105098306A - Spin wave lead wire based on surface magnetic anisotropy - Google Patents
Spin wave lead wire based on surface magnetic anisotropy Download PDFInfo
- Publication number
- CN105098306A CN105098306A CN201510457325.7A CN201510457325A CN105098306A CN 105098306 A CN105098306 A CN 105098306A CN 201510457325 A CN201510457325 A CN 201510457325A CN 105098306 A CN105098306 A CN 105098306A
- Authority
- CN
- China
- Prior art keywords
- spin wave
- magnetic anisotropy
- magnetic
- mode
- spin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Hall/Mr Elements (AREA)
Abstract
The invention belongs to the technical field of a magnetic device, and specifically relates to a spin wave lead wire based on surface magnetic anisotropy. The spin wave lead wire is based on a magnetic thin film material with the surface magnetic anisotropy. When the surface of the magnetic thin film material has the surface magnetic anisotropy, an additional surface spin wave mode occurs, and the energy gap of a spin wave in the mode is lower than that of a body mode. When a work frequency is disposed between a surface wave mode and the body mode, the spin wave can be spread in an area with the surface magnetic anisotropy. If a part of the surface of the magnetic thin film material is selectively enabled to have the surface magnetic anisotropy, the spreading path of the spin wave can be controlled randomly. Since a spin wave in a surface wave mode has a certain penetrating depth, the spin wave lead wire provided by the invention has the advantages of low energy consumption, easy experimental preparation, easy industrial integration and the like.
Description
Technical field
The invention belongs to magnetic device technical field, be specifically related to a kind of spin wave wire based on surface magnetic anisotropy.
Background technology
Spin be continue modern with the desirable information carrier of electronics, the light information technology of future generation that is information carrier.Spin wave is a kind of collective excitation of magnetic moment in magnetic material, effectively can carry spin information.Be different from electronics to propagate in conductor material, spin wave can be propagated in magnetic conductor, semiconductor, insulator, and therefore the degree of freedom of spin wave device on Material selec-tion is much larger than electronic device.Meanwhile, without the need to the movement of electronics, therefore there is not Joule heat in spin wave, thus more effectively can reduce the loss in transmitting procedure, has enormous benefits for energy-conservation.
The basic components building process spin wave information comprise spin wave diode, spin wave triode etc., wherein the most indispensable wire being just used to transmission spin wave.As the elemental device in spin information treatment system, the function of spin wave wire is each function element that leads as the spin wave of information carrier to process, and this just requires that spin wave wire can low-loss and easily arranging.
Summary of the invention
The object of the present invention is to provide a kind of spin wave wire based on surface magnetic anisotropy.
Spin wave wire based on surface magnetic anisotropy provided by the invention, based on the magnetic membrane material having surface magnetic anisotropy, and this magnetic membrane material carries out surface (comprising upper surface, lower surface) by known magnetron sputtering technique) modify, make it have surface magnetic anisotropy, namely the easy axle of film surface layer is perpendicular to surface.
In the present invention, described magnetic membrane material has magnetic anisotropy in uniaxial anisotropy, twin shaft magnetic anisotropy or other face, and its each magnetic anisotropy axle is in pellicular front.
Spin wave wire of the present invention, in interior propagation is surface wave mode spin wave.The spin wave of this pattern only can be excited and propagate when magnetic membrane material has surface magnetic anisotropy.
Spin wave wire of the present invention, its operating frequency lower than the bulk-mode energy gap of magnetic membrane material, higher than surface wave mode energy gap.
The calculated results shows, the spin spectrum having the material of easy axle surface magnetic anisotropy can have more a surface wave mode, and its energy gap is lower relative to bulk-mode, and its space penetration depth and surface magnetic anisotropy intensity are inverse ratio.
The present invention is only made up of magnetic material.
To main the principles of science of this phenomenon be set forth below:
In magnetic material, the kinetics equation of magnetic is described by LLG (Landau-Lishitz-Gilbert) equation:
（1）
Wherein
mnormalized amount of magnetization,
glibert magneto damped coefficient,
it is gyromagnetic coefficient.The effective field that each magnetic moment is experienced
can be expressed as:
(2)
Wherein A is magnetic exchange coefficient, and K is uniaxial anisotropy coefficient, and uniaxial magnetic anisotropic points to x direction,
for Laplacian.In addition, the magnetic material having surface magnetic anisotropy can experience an Equivalent Surface magnetic anisotropy field in its surface:
(3)
Wherein,
for surface magnetic anisotropy constant (
>0 represents easy axle surface magnetic anisotropy),
nfor the normal vector of magnetic membrane material.
Compared with prior art, the present invention has the following advantages:
(1) the spin wave wire described in the present invention is based on magnetic material, and information carrier is wherein spin wave, is not conduction electrons, has evaded Joule heat, thus greatly can reduce the power consumption of device.The present invention is one of important component of following spin wave device;
(2) what propagate in spin wave wire in the present invention is surface wave mode spin wave, therefore has certain penetration depth.Because the concentration of energy of spin wave is in the finite region of pressing close to surface, the energy needed for excitating surface ripple is compared to exciting bulk-mode much lower, and energy consumption is lower compared to traditional spin wave wire;
(3) in the present invention, the arrangement of spin wave wire can by growing dissimilar materials or the selective modification of other surperficial control methods realizations to magnetic thin film surface magnetic anisotropy.Because known magnetron sputtering technique is very ripe, spin wave wire can be arranged into arbitrary structure.
Accompanying drawing explanation
Fig. 1 has the magnetic membrane material generalized section of surface magnetic anisotropy.
Fig. 2 has the spin wave dispersion frequency spectrum of the magnetic thin film of surface magnetic anisotropy.
Fig. 3 spin wave wire arrangement schematic diagram.
Fig. 4 spin wave wire arrangement analogous diagram.
Embodiment
Describe the present invention in detail below in conjunction with specific embodiments and the drawings, but the present invention is not limited to this.The present embodiment adopts body material 1 for yttrium iron garnet (YIG), wherein magnetic exchange coefficient A=0.328e-10Am, uniaxial anisotropy COEFFICIENT K=0.388e5A/m, gyromagnetic coefficient is 2.21e5Hz/ (A/m), upper surface 2 thickness having surface magnetic anisotropy is 3nm, its surface magnetic anisotropy COEFFICIENT K 1=3.33e5A/m.
Fig. 1 is the magnetic membrane material generalized section having surface magnetic anisotropy, has the body material 1 of uniaxial anisotropy, and its uniaxial anisotropy direction is in pellicular front, the x direction namely in Fig. 1.Have the upper surface 2 of surface magnetic anisotropy, its surface magnetic anisotropy direction perpendicular to surface, the y direction namely in Fig. 1.Under stable state, magnetic moment points to x direction.
Fig. 2 is the spin wave dispersion frequency spectrum of the magnetic thin film having surface magnetic anisotropy.Transverse axis is spin wave wave vector in the x direction, and the longitudinal axis is the stimulating frequency of spin wave.The existence of surface magnetic anisotropy result in the appearance of surface wave mode 3, and compared to the bulk-mode 4 that only there is uniaxial anisotropy, the energy gap of surface wave mode 3 is lower.Surface anisotropic is stronger, then the energy gap difference between surface wave mode 3 and bulk-mode 4 is larger.
Fig. 3 is spin wave wire arrangement schematic diagram.Have in the magnetic membrane material 1 of uniaxial anisotropy, magnetic moment points to easy axis direction (y direction).The superficial layer 2 having surface magnetic anisotropy grows at magnetic membrane material 1 upper surface, forms arbitrary figure.
Fig. 4 is spin wave wire arrangement analogous diagram.At port 5, place applies an alternating magnetic field, the frequency of this alternating magnetic field is lower than bulk-mode 4 energy gap in Fig. 2, but higher than surface wave mode 3 energy gap, therefore the region only having surface magnetic anisotropy to exist has surface wave mode spin wave and propagates, and the region only having unit anisotropy at all the other does not have spin wave to propagate.This structure is spin wave wire, and the structure of wire depends on the distribution of surface magnetic anisotropy layer.In addition, surface wave mode spin wave is only propagated against the upper surface of magnetic membrane material, and its penetration depth is inversely proportional to surface magnetic anisotropy intensity.
Claims (4)
1. the spin wave wire based on surface magnetic anisotropy, it is characterized in that this spin wave wire is based on the magnetic membrane material having magnetic anisotropy in face, and this magnetic membrane material carries out finishing by known magnetron sputtering technique, make it have surface magnetic anisotropy, namely the easy axle of film surface layer is perpendicular to surface.
2. spin wave wire according to claim 1, is characterized in that described magnetic membrane material has magnetic anisotropy in uniaxial magnetic anisotropy, twin shaft magnetic anisotropy or other face; Its each magnetic anisotropy axle is in pellicular front.
3. spin wave wire according to claim 1, what it is characterized in that within it propagating is surface wave mode spin wave, and the spin wave of this pattern only can be excited and propagate when magnetic membrane material has surface magnetic anisotropy.
4. the spin wave wire according to claim 1,2 or 3, is characterized in that the bulk-mode energy gap of its operating frequency lower than magnetic membrane material, higher than surface wave mode energy gap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510457325.7A CN105098306A (en) | 2015-07-30 | 2015-07-30 | Spin wave lead wire based on surface magnetic anisotropy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510457325.7A CN105098306A (en) | 2015-07-30 | 2015-07-30 | Spin wave lead wire based on surface magnetic anisotropy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105098306A true CN105098306A (en) | 2015-11-25 |
Family
ID=54578245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510457325.7A Pending CN105098306A (en) | 2015-07-30 | 2015-07-30 | Spin wave lead wire based on surface magnetic anisotropy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105098306A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110190367A (en) * | 2019-05-23 | 2019-08-30 | 复旦大学 | A kind of ultra wide band differential lines common-mode noise filter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4511865A (en) * | 1984-02-21 | 1985-04-16 | The United States Of America As Represented By The Secretary Of The Army | Millimeter wave signal limiter having ferrite loaded slots in ground plane of image guide |
| US20130147579A1 (en) * | 2011-12-09 | 2013-06-13 | Hitachi Ltd. | Spin-wave waveguide and spin wave operation circuit |
| US20150085569A1 (en) * | 2011-08-23 | 2015-03-26 | National Institute Of Advanced Industrial Science And Technology | Electric field ferromagnetic resonance excitation method and magnetic function element employing same |
| CN104767020A (en) * | 2015-03-20 | 2015-07-08 | 复旦大学 | Spin wave directional transmission waveguide structure |
-
2015
- 2015-07-30 CN CN201510457325.7A patent/CN105098306A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4511865A (en) * | 1984-02-21 | 1985-04-16 | The United States Of America As Represented By The Secretary Of The Army | Millimeter wave signal limiter having ferrite loaded slots in ground plane of image guide |
| US20150085569A1 (en) * | 2011-08-23 | 2015-03-26 | National Institute Of Advanced Industrial Science And Technology | Electric field ferromagnetic resonance excitation method and magnetic function element employing same |
| US20130147579A1 (en) * | 2011-12-09 | 2013-06-13 | Hitachi Ltd. | Spin-wave waveguide and spin wave operation circuit |
| CN104767020A (en) * | 2015-03-20 | 2015-07-08 | 复旦大学 | Spin wave directional transmission waveguide structure |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110190367A (en) * | 2019-05-23 | 2019-08-30 | 复旦大学 | A kind of ultra wide band differential lines common-mode noise filter |
| CN110190367B (en) * | 2019-05-23 | 2020-11-20 | 复旦大学 | Ultra-wideband differential line common mode noise filter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Sadovnikov et al. | Nonlinear spin wave coupling in adjacent magnonic crystals | |
| Sadovnikov et al. | Nonlinear spin wave effects in the system of lateral magnonic structures | |
| Mousavi et al. | Gyromagnetically induced transparency of metasurfaces | |
| Geiler et al. | Multiferroic heterostructure fringe field tuning of meander line microstrip ferrite phase shifter | |
| Sadovnikov et al. | Nonreciprocal propagation of hybrid electromagnetic waves in a layered ferrite–ferroelectric structure with a finite width | |
| Thoma et al. | Electromagnetic wave propagation through an overdense magnetized collisional plasma layer | |
| Balinskiy et al. | Spin wave interference in YIG cross junction | |
| Kryshtal et al. | Nonreciprocity of spin waves in magnonic crystals created by surface acoustic waves in structures with yttrium iron garnet | |
| CN105098306A (en) | Spin wave lead wire based on surface magnetic anisotropy | |
| Westford | The wave equations for electromagnetic radiation in an ionized medium in a magnetic field | |
| Shen et al. | Robust and tunable one-way magnetic surface plasmon waveguide: an experimental demonstration | |
| CN105070824B (en) | A kind of restructural spin wave network of conductors based on neticdomain wall | |
| Popov et al. | Ferromagnetic resonance in a single crystal of iron borate and magnetic field tuning of hybrid oscillations in a composite structure with a dielectric: Experiment and theory | |
| Sigalov et al. | Manipulation of the radiation characteristics of a patch antenna by small ferrite disks inserted in its cavity domain | |
| Pincus et al. | Ferromagnetic relaxation. II. The role of four-magnon processes in relaxing the magnetization in ferromagnetic insulators | |
| Mruczkiewicz et al. | Magnonic bandgaps in metalized 1-D YIG magnonic crystals | |
| Rybin | Microwave effective medium theory for two-component magnetic metamaterials | |
| CN108649304B (en) | Electromagnetic wave isolator based on magneto-optical medium | |
| CN102544660B (en) | Method for controlling adjustable one-way waveguide based on anisotropic gyromagnetic medium | |
| But’ko et al. | Absorption of electromagnetic waves in a nonmagnetic conductor-ferromagnet structure | |
| CN106711321B (en) | A kind of spin wave wave plate | |
| Nikitin et al. | Control of magnetoelectric antenna by electric field | |
| Bulgakov et al. | Surface electromagnetic waves in thin-layer biaxial structure in a magnetic field | |
| Jia et al. | Magnetic dynamics driven by the spin current generated via the spin Seebeck effect | |
| Kanazawa et al. | Spin wave absorber generated by artificial surface anisotropy for spin wave device network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20151125 |
|
| WD01 | Invention patent application deemed withdrawn after publication |