CN109166599A - A kind of complete optomagnetic inverting method of rotation direction dependence based on single order rotation direction polarization vortex light - Google Patents
A kind of complete optomagnetic inverting method of rotation direction dependence based on single order rotation direction polarization vortex light Download PDFInfo
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- CN109166599A CN109166599A CN201811154711.9A CN201811154711A CN109166599A CN 109166599 A CN109166599 A CN 109166599A CN 201811154711 A CN201811154711 A CN 201811154711A CN 109166599 A CN109166599 A CN 109166599A
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- G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
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- G11C13/06—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam using magneto-optical elements
Abstract
The invention discloses a kind of rotation directions based on single order rotation direction polarization vortex light to rely on complete optomagnetic inverting method, since polarization singular point and phase singularity are focusing the interaction in space, the single order rotation direction that topological charge is+1 and -1 polarizes vortex light will generate Left-hand circular polarization field and right-hand circular polarization field respectively in focusing space, under the conditions of high-NA, single order rotation direction polarizes vortex light and generates the circular polarization focousing field that lateral dimension is less than traditional circularly polarized light focal beam spot lateral dimension.The rotation direction realized using the method for the present invention relies on complete optomagnetic inversion region area will be smaller by 30% than inversion region area caused by traditional circularly polarized light, provide effective solution for ultra high density, ultrafast magnetic storage.
Description
Technical field
The invention belongs to optomagnetic technical field of memory, and in particular to a kind of rotation direction based on single order rotation direction polarization vortex beam
Rely on complete optomagnetic inverting method technology.
Background technique
Magnetic storage plays highly important role in field of data storage.For example, the hard disk being widely used now
(Hard Disk Drive, HDD) just carries out mass memory and quickly processing to huge information data using magnetic storage technology.
With the progress of science, magnetic storage technology is constantly developed and reformed to people.Over the last couple of decades, with logical bits " 0 "
" 1 " is widely used in high density magnetic storage as the perpendicular recording digital storage technique of storage unit.In this technology
In, people hang down to magnetic material magnetization unit to realize using applying vertical magnetic field (i.e. magnetic direction is perpendicular to magnetic material surface)
Straight reversion control.In order to steadily keep records of information for more time, big coercitive magnetic material is often used as storage
Medium.For this purpose, additional high-intensity magnetic field becomes the necessary condition to realize high-density perpendicular magnetic recording.However, current commercial product
Magnetic head can only generate less than the limited magnetic field of 2.4T, bring huge difficulty to high-density perpendicular magnetic recording.To solve this
One problem, there has been proposed heat-assisted magnetic recording method (the Heat assisted magnetic for combining laser pulse radiation
recording,HAMR).Laser pulse can fast lifting magnetic material temperature, be reduced rapidly the coercivity of magnetic material, and then subtract
Small required externally-applied magnetic field.Nevertheless, the electron spin of magnetic material is come in the form of precession under the action of external magnetic field
Reversion process is completed, the characteristic time is several nanoseconds, this just greatly limits the rate of magnetic inversion.As it can be seen that how to realize super
Fast magnetic inversion becomes the important issue of magnetic fields.
2007, complete optomagnetic reversion (All-optical magnetic switching, AOS) was put forward for the first time by people
(C.D.Stanciu,et al.,Phys.Rev.Lett.99,047601(2007)).Studies have shown that without any externally-applied magnetic field
Under conditions of, merely with the circularly polarized laser pulse that pulsewidth is 40fs as excitaton source, ferrimagnetic material GdFeCo can be realized
The complete optomagnetic reversion (All-optical helicity-dependent switching, AO-HDS) that rotation direction relies on.Due to this
One magnetic inversion process is to realize (I.Radu, et al., Nature by the strong exchange-coupling interaction of Gd and Fe subgrain compartment
472,205 (2011)), reversing time can foreshorten within 100ps (K.Vahaplar, et al.,
Phys.Rev.Lett.103,117201(2009)).This provides effective way for ultrafast magnetic recording.However, current people are only
Using circularly polarized incident light in ferrimagnetic material (GdFeCo, TbCo, TbFe etc.) or ferromagnetic material under the conditions of low numerical aperture
Full magneto-optical recorder is carried out on (Co/Pt multilayer material, FePtAgC membrana granulosa etc.), spatially transverse reversion size rests on micron
Scale is unfavorable for high density data storage.Therefore, the small spatial scale focal beam spot with circular polarization state how is obtained to superelevation
Density, ultrafast magnetic storage are most important.
The polarization state that single order rotation direction polarizes vortex light is rotation direction polarization state (Azimuthal polarization), phase
With topological charge be ± 1, i.e. 0~2 π, Spiral distribution.Under the conditions of high NA focus, such light beam focal beam spot is horizontal
It is much smaller than traditional circularly polarized light focal beam spot to size, and there is purely lateral circular polarization state.
Summary of the invention
The purpose of the present invention is to overcome the shortcomings of the existing technology and deficiency, provides a kind of polarize using single order rotation direction and is vortexed
Light realizes that rotation direction relies on the completely new technical solution of complete optomagnetic reversion.
To achieve the purpose of the present invention, used scheme are as follows: it is a kind of based on single order rotation direction polarization vortex light rotation direction according to
The optomagnetic inverting method of Lai Quan is the incident light of rotation direction polarization state including polarization state, and it is ± 1 spiral shell that the incident light, which has topological charge,
Revolve phase distribution；
The incident light that topological charge is+1 or -1 is radiated in magnetic storage media, makes magnetic storage media that rotation direction occur and relies on entirely
Optomagnetic reversion；
The magnetic storage media is the ferrimagnetic material or ferromagnetic material that can be realized rotation direction and rely on complete optomagnetic reversion.
Preferably, the incident light generates by the following method, using pulse laser by rotation direction polarization conversion device with
The helical phase modulator that topological charge is ± 1 polarizes incident light, produced by phase-modulation.
More preferably, rotation direction polarization conversion device be using birefringent or dichroism to incident linear polarization or circularly polarized light into
Row polarization state modulates and generates rotation direction polarised light.Common rotation direction polarization conversion device includes liquid crystal polarized converter, half-wave plate
Combination, sub-wave length grating etc..In addition, can also generate rotation direction polarization by laser cavity external interference or the selection of laser intracavity modal
Light.Common helical phase modulator includes spiral phase plate, spatial light modulator etc..
Preferably, ferrimagnetic material GdFeCo, TbFeCo, TbFe, TbCo, DyCo or HoFeCo, or, ferromagnetic material is
Co/Pt multilayer material or FePtAgC membrana granulosa.
Preferably, the incident light is focused in the magnetic storage media using condenser lens, focal beam spot has pure
Lateral circular polarization state.
Preferably, when the magnetic storage media is GdFeCo, the mean energy density of the incident light is not less than
4.83mJ/cm2。
Preferably, by incident light by single laser pulse excitation in a manner of be radiated in magnetic storage media, or, by incident light with
The mode of more laser pulse scanning excitations is radiated in magnetic storage media.
Preferably, the magnetic storage media can also be rare earth-transition metal multi-layer film structure or heterojunction structure.
Preferably, the magnetic storage media is obtained by Grown by Magnetron Sputtering mode.
Preferably, the incident light is focused in the magnetic storage media using condenser lens, and, the number of condenser lens
Value aperture is NA=0.95, annular factor-beta=0.95 of incident light.
Preferably, focal beam spot polarizes field component that annular is not longitudinal, and remains solid purely lateral polarization field
The lateral dimension of focal beam spot is reduced under the premise of keeping lateral circular polarization state, and then can obtain there is smaller lateral dimension
Complete optomagnetic inversion region.
The present invention realizes that small spatial scale rotation direction relies on the principle of complete optomagnetic reversion using single order rotation direction polarization vortex beam
It is as follows:
The center of single order rotation direction polarization vortex beam has polarization singular point and phase singularity, in focusing, due to inclined
The interaction of vibration singular point and phase singularity can generate solid focal beam spot in focusing space, and the polarization state of focal spot is pure
Lateral circular polarization or elliptical polarization.When the numerical aperture of condenser lens is larger, traditional circularly polarized light focal beam spot can be generated
The extremely strong longitudinal polarization field of annular, and single order rotation direction polarization vortex beam focal beam spot remains purely lateral polarization field, into
And the lateral dimension of focal beam spot is reduced under the premise of keeping circular polarization state.Circular polarization focal beam spot exposes to complete optomagnetic anti-
Turn after material (by taking ferrimagnetic material GdFeCo as an example), material is brought rapidly up to more than Curie temperature, Gd sublattice and Fe subgrain
Lattice can generate extremely strong exchange interaction, cause the rapid reversion of sublattice.Entire spin-flip process (including reversion
Relaxation process) occur within 100ps.Since the complete optomagnetic reversion material has apparent magnetocircular dichroism, to not
It is different with rotation direction circularly polarized light absorption efficiency, and then produce the energy window that rotation direction relies on complete optomagnetic reversion.It is i.e. final to realize
Ultrafast, small spatial scale rotation direction relies on complete optomagnetic reversion.
The present invention has the following advantages and effects with respect to the prior art:
(1) when the numerical aperture of condenser lens is larger, it is vertical that traditional circularly polarized light focal beam spot can generate extremely strong annular
To polarization field, and single order rotation direction polarization vortex light focal beam spot remains solid purely lateral polarization field, can keep horizontal
To the lateral dimension for reducing focal beam spot under the premise of circular polarization state.Experiment shows that the rotation direction realized using the method is relied on
Complete optomagnetic inversion region area will be smaller by 30% than inversion region area caused by traditional circularly polarized light.
(2) under the conditions of high-NA, longitudinal direction polarization field produced by traditional circularly polarized light focal beam spot reduces focal spot
The polarization purity of lateral circular polarization field greatly affected the energy window that rotation direction relies on complete optomagnetic reversion.And single order rotation direction is inclined
The purely lateral circular polarization focal beam spot of vibration vortex light can get optimal energy window.
Detailed description of the invention
Fig. 1 is the polarization state for the single order rotation direction polarization vortex beam that topological charge is ± 1 and phase distribution and its corresponding focuses
The schematic diagram of normalization field strength and the polarization state distribution of field；
Fig. 2 is that traditional circularly polarized light (CP beam) focal beam spot and single order rotation direction polarize vortex light (FAPV beam) and focus
The surface chart that hot spot transverse direction full width at half maximum (FWHM) changes with the annular factor (β) of NA and incident ring light；
Fig. 3 is the variation in Fig. 2 with NA and β, and compared with traditional circularly polarized light, single order rotation direction polarizes vortex light and focuses light
The diminution percentage schematic diagram of spot lateral dimension；
Fig. 4 is to polarize vortex light using single order rotation direction to realize that rotation direction relies on complete optomagnetic reversion on ferrimagnetic material GdFeCo
Schematic diagram；
Fig. 5 is the initial magnetization field distribution schematic diagram of GdFeCo material in the embodiment of the present invention；
Fig. 6 is to polarize GdFeCo material under vortex light excites in the single order rotation direction that topological charge is+1 in the embodiment of the present invention
Reversion schematic diagram；
Fig. 7 is to polarize GdFeCo material under vortex light excites in the single order rotation direction that topological charge is -1 in the embodiment of the present invention
Reversion schematic diagram；
Fig. 8 be the embodiment of the present invention in laser mean energy density to GdFeCo material entirely optomagnetic reversion influence variation show
It is intended to.
Specific embodiment
Specific embodiments of the present invention will be further explained with reference to the accompanying drawing:
Fig. 1 show the polarization state and phase distribution and its corresponding for the single order rotation direction polarization vortex beam that topological charge is ± 1
The numerical simulation result of normalization field strength and the polarization state distribution of focal plane focousing field.The a length of 400nm of incident light wave, condenser lens
Numerical aperture (NA) is 0.005.Topological charge be+1 and -1 incident light focousing field polarization state be respectively Left-hand circular polarization state and
Right-hand circular polarization state passes through the rotation direction of the positive and negative i.e. controllable focal beam spot circular polarization state of control incident light topological charge.
Fig. 2 show traditional circularly polarized light (CP beam) focal beam spot and single order rotation direction polarization vortex light (FAPV beam)
The surface chart that focal beam spot transverse direction full width at half maximum (FWHM) changes with NA and β.Wherein, in order to reduce the transverse direction of focal spot as much as possible
Size, the NA in addition to increasing condenser lens usually also introduce ring-incidence light beam, and the ratio of internal diameter and outer diameter is β.
Fig. 3 show the variation with NA and β, and compared with traditional circularly polarized light, single order rotation direction polarizes vortex light and focuses light
The diminution percentage of spot lateral dimension.From in figure it can be found that under optimal condition, i.e. when NA=0.95, β=0.95, two
The lateral dimension of kind light beam focal beam spot is respectively 228nm and 160nm, i.e. focal spot lateral dimension reduces 30%.
Fig. 4 is shown in the present embodiment, and rotation is realized on ferrimagnetic material GdFeCo using single order rotation direction polarization vortex light
To the schematic diagram for relying on complete optomagnetic reversion.In the present embodiment, incident pulse optical maser wavelength is 400nm, pulsewidth 40fs.Utilize arteries and veins
Rush the repetitive rate that selector accurately controls pulse laser.Use in conjunction polarization conversion device and phase-modulator, can will be incident
Linearly polarized light is converted to single order rotation direction polarization vortex light.Ferrimagnetic material GdFeCo alloy is as obtained by the method for magnetron sputtering
It arrives, for example, one of specific component can choose Gd27Fe63.87Co9.13, specific film layer structure is Glass/AlTi
(10nm)/SiN(5nm)/GdFeCo(20nm)/SiN(60nm).Detection light is wavelength 800nm, pulsewidth 40fs, repetitive rate 1kHz
Linear polarization pulse laser.According to Faraday effect, the magnetizing field of different orientation can generate identical Polarization Detection light different
Rotation effect.Under the action of analyzer, the magnetization field areas of different orientation can be presented on charge-coupled device (CCD) contrasts
Spend different pictures.The present embodiment is to carry out at room temperature in air.
Further:
Vortex light focusing light field, which is polarized, for verifying single order rotation direction realizes that rotation direction relies on complete optomagnetic reversion in GdFeCo material
Feasibility, we choose condenser lens NA=0.005, and corresponding focal beam spot lateral dimension is about 42 μm.Exciting light is averaged
Energy density is 5.08mJ/cm2 (mean energy density is equal to single pulse energy divided by the horizontal area of focal beam spot).
Fig. 5 show the initial magnetization field of GdFeCo material, and black region (left side) indicates that magnetizing field initial orientation is downward,
White area (right side) indicates that magnetizing field initial orientation is upward.
Fig. 6 show the reversion result of the GdFeCo material in the case where the single order rotation direction that topological charge is+1 polarizes the excitation of vortex light.
Wherein, the dotted inversion region of black that right area generates is to be excited to generate by single laser pulse, and black ribbon inversion region is
It is generated by the multiple-pulse scanning excitation that repetitive rate is 100Hz, laser scanning speed is about 29.8 μm/s.It can be found that when excitation
When the topological charge of light is+1, complete optomagnetic reversion is had occurred in white area, and black region keeps original state.
Fig. 7 show the reversion result of the GdFeCo material in the case where the single order rotation direction that topological charge is -1 polarizes the excitation of vortex light.
It can be found that complete optomagnetic reversion has occurred in black region, and white area keeps initial when the topological charge of exciting light is -1
State.The above results, which clearly demonstrate single order rotation direction polarization vortex light focusing light field, can be realized rotation direction in GdFeCo material
Rely on the effect of complete optomagnetic reversion.
Fig. 8 show influence of the laser mean energy density to the optomagnetic reversion entirely of GdFeCo material.Incident light is topological charge
Vortex light is polarized for+1 single order rotation direction.As can be seen that complete optomagnetic inversion region lateral dimension is with laser mean energy density
Reduction and reduce.When laser mean energy density is decreased to 4.83mJ/cm2When, complete optomagnetic inversion region diameter is about 1.1 μ
m.When laser mean energy density is less than 4.83mJ/cm2When, complete optomagnetic reversal development will not occur for GdFeCo material.This is
Since GdFeCo has soft magnetic characteristic, the smallest domain size is about 1-3 μm.Therefore, even if increasing the numerical value of condenser lens
Aperture reduces the lateral dimension of focal beam spot, and single order rotation direction polarization vortex light can not be also verified in GdFeCo material to be produced
The complete optomagnetic inversion region of raw smaller lateral dimension.
Nevertheless, complete optomagnetic inverting method proposed by the invention but can be applied to other ferrimagnetic materials (such as
TbFe, TbCo, TbFeCo) or ferromagnetic material (Co/Pt multilayer material, FePtAgC membrana granulosa etc.).These complete optomagnetic reversion materials
There are lesser domain size (about tens nanometers), under the irradiation of single order rotation direction polarization vortex light, these materials be can be realized
Rotation direction relies on complete optomagnetic reversion.Therefore, compared to traditional circularly polarized light, single order rotation direction polarization vortex light in these materials can
The rotation direction for generating smaller lateral dimension relies on complete optomagnetic inversion region, and then realizes ultrafast, the full magneto-optical recorder of ultra high density.
Above-described embodiment is one of embodiments of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, such as the production method of single order rotation direction polarization vortex beam, complete optomagnetic reversion material component or film layer structure in the present invention
Change.Other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (9)
1. a kind of rotation direction based on single order rotation direction polarization vortex light relies on complete optomagnetic inverting method, it is characterised in that: including polarization
State is the incident light of rotation direction polarization state, and there is the incident light helical phase that topological charge is ± 1 to be distributed；
The incident light that topological charge is+1 or -1 is radiated in magnetic storage media, makes magnetic storage media that rotation direction dependence occur complete optomagnetic
Reversion；
The magnetic storage media is the ferrimagnetic material or ferromagnetic material that can be realized rotation direction and rely on complete optomagnetic reversion.
2. the rotation direction according to claim 1 based on single order rotation direction polarization vortex light relies on complete optomagnetic inverting method, special
Sign is: the incident light generates by the following method,
Incident light is carried out by the helical phase modulator that rotation direction polarization conversion device and topological charge are ± 1 using pulse laser
Produced by polarization, phase-modulation.
3. the rotation direction according to claim 1 based on single order rotation direction polarization vortex light relies on complete optomagnetic inverting method, special
Sign is: ferrimagnetic material GdFeCo, TbFeCo, TbFe, TbCo, DyCo or HoFeCo, or,
Ferromagnetic material is Co/Pt multilayer material or FePtAgC membrana granulosa.
4. the rotation direction according to claim 1 based on single order rotation direction polarization vortex light relies on complete optomagnetic inverting method, special
Sign is: being focused on the incident light in the magnetic storage media using condenser lens, focal beam spot has purely lateral circle inclined
Polarization state.
5. the rotation direction according to claim 4 based on single order rotation direction polarization vortex light relies on complete optomagnetic inverting method, special
Sign is: when the magnetic storage media is GdFeCo, the mean energy density of the incident light is not less than 4.83mJ/cm2。
6. the rotation direction according to claim 1 based on single order rotation direction polarization vortex light relies on complete optomagnetic inverting method, special
Sign is: incident light is radiated in magnetic storage media in a manner of the excitation of single laser pulse, or,
Incident light is radiated in magnetic storage media in a manner of the scanning excitation of more laser pulses.
7. the rotation direction according to claim 1 based on single order rotation direction polarization vortex light relies on complete optomagnetic inverting method, special
Sign is: the magnetic storage media can also be rare earth-transition metal multi-layer film structure or heterojunction structure.
8. the rotation direction according to claim 1 based on single order rotation direction polarization vortex light relies on complete optomagnetic inverting method, special
Sign is: the magnetic storage media is obtained by Grown by Magnetron Sputtering mode.
9. the rotation direction according to claim 1 based on single order rotation direction polarization vortex light relies on complete optomagnetic inverting method, special
Sign is: the incident light focused in the magnetic storage media using condenser lens, and, the numerical aperture of condenser lens is
NA=0.95, annular factor-beta=0.95 of incident light.
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| CN111257407A (en) * | 2020-03-08 | 2020-06-09 | 北京工业大学 | First-order reversal magnetization response matrix characterization method for ferromagnetic material performance |
| CN112562744A (en) * | 2020-07-03 | 2021-03-26 | 暨南大学 | Double-pulse excitation method for ultrafast and super-resolution full photomagnetic recording |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111257407A (en) * | 2020-03-08 | 2020-06-09 | 北京工业大学 | First-order reversal magnetization response matrix characterization method for ferromagnetic material performance |
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| CN112562744A (en) * | 2020-07-03 | 2021-03-26 | 暨南大学 | Double-pulse excitation method for ultrafast and super-resolution full photomagnetic recording |
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| WO2022000937A1 (en) * | 2020-07-03 | 2022-01-06 | 暨南大学 | Dual-pulse excitation method for ultrafast and super-resolution all-optical magnetic recording |
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Application publication date: 20190108 |