阅读说明：本技术 一种基于石墨烯和金属复合材料产生斯格明子的方法 (Method for generating sigmin based on graphene and metal composite material ) 是由 赵国平 饶选秀 赵莉 梁雪 于 2021-08-04 设计创作，主要内容包括：本发明公开一种基于石墨烯和金属复合材料产生斯格明子的方法,包括以下步骤：构建磁性多层膜结构和产生斯格明子；本发明通过调节石墨烯与铁磁之间的厚度以调节该结构的DMI值和PMA值,以及复合材料层的DMI值以实现磁结构中斯格明子的产生,通过在电流注入层注入自旋极化电流产生斯格明子,石墨烯的加入实现更好地对该结构DMI值和PMA值进行调控,在一个较大范围内实现各种磁结构的成核,且石墨烯和铁磁可以诱导出较大的DMI,该DMI不再需要非磁性层具有强大的自旋轨道耦合,大大扩展了异质结构材料选择范围；另外石墨烯的加入不仅可以对金属层起到抗氧化作用,还能作为活性剂利于铁磁层生长,形成多层膜结构,可实现性更强。(The invention discloses a method for generating sigramins based on graphene and metal composite materials, which comprises the following steps: constructing a magnetic multilayer film structure and generating a sigramin; the thickness between the graphene and the ferromagnetic body is adjusted to adjust the DMI value and the PMA value of the structure and the DMI value of the composite material layer to realize generation of the SgGemin in the magnetic structure, the spin-polarized current is injected into the current injection layer to generate the SgGemin, the addition of the graphene realizes better regulation and control of the DMI value and the PMA value of the structure, nucleation of various magnetic structures is realized in a larger range, the graphene and the ferromagnetic body can induce larger DMI, the DMI does not need a nonmagnetic layer to have strong spin-orbit coupling, and the selection range of heterogeneous structure materials is greatly expanded; in addition, due to the addition of the graphene, an anti-oxidation effect can be achieved on the metal layer, the graphene can be used as an active agent to be beneficial to the growth of the ferromagnetic layer, a multilayer film structure is formed, and the realizability is higher.)

1. A method for producing Sgeminm based on graphene and metal composite materials is characterized by comprising the following steps: the method comprises the following steps:

the method comprises the following steps: construction of magnetic multilayer film structures

Firstly, arranging a composite material layer CoPt on a substrate layer, then adding a ferromagnetic layer Co on the composite material layer, then arranging a graphene layer on the ferromagnetic layer, and finally arranging a current injection layer on the graphene layer, wherein the substrate layer, the composite material layer, the ferromagnetic layer, the graphene layer and the current injection layer jointly form a complete calculation model, and the substrate layer, the composite material layer, the ferromagnetic layer, the graphene layer and the current injection layer are at the same geometric center;

step two: production of siganmin

According to the first step, after the magnetic multilayer film structure is constructed, a spin-polarized current is injected into the current injection layer, the injection time is 0.5ns, the PMA value between the graphene layer and the ferromagnetic layer and the DMI value of the ferromagnetic layer and the composite material layer are adjusted, and finally, the sGermin is generated.

2. The method for producing skyrmions based on graphene and metal composites as claimed in claim 1, wherein: in the first step, the substrate layer, the composite material layer, the ferromagnetic layer, the graphene layer and the current injection layer are all disc structures, the radius of the substrate layer, the radius of the composite material layer, the radius of the ferromagnetic layer and the radius of the graphene layer are 100nm, the radius of the current injection layer is 10nm, and the thickness of the ferromagnetic layer is 0.4 nm.

3. The method for producing skyrmions based on graphene and metal composites as claimed in claim 1, wherein: in the first step, the substrate layer is a magnesium oxide insulating substrate, the composite material layer is a ferromagnetic and heavy metal layer, and the heavy metal layer is a Pt layer.

4. The method for producing skyrmions based on graphene and metal composites as claimed in claim 3, wherein: the ferromagnetism and the heavy metal act to generate a DMI value required for stabilizing the magnetic skynergen, and the graphene layer and the ferromagnetic layer act to form an adjustable DMI value and a PMA value.

5. The method for producing skyrmions based on graphene and metal composites as claimed in claim 1, wherein: in the second step, after the spin-polarized current is injected into the current injection layer, the ferromagnetic material and the heavy metal provide DM interaction due to giant spin orbit coupling, and after the spin-polarized current is injected, a skullet is generated.

6. The method for producing skyrmions based on graphene and metal composites as claimed in claim 1, wherein: in the second step, after the current injection layer injects the spin-polarized current, the graphene acts to generate a DMI value and increase a PMA value between the graphene layer and the ferromagnetic layer, and the current injection layer injects the spin-polarized current to successfully generate the sgemins.

Technical Field

The invention relates to the technical field of siganus oramin, in particular to a method for generating siganus oramin based on graphene and a metal composite material.

Background

With the rapid development of modern electronic information technology, higher and higher requirements are put forward on the storage density and energy consumption of a magnetic information storage device, and the size of a magnetic skynerger with particle characteristics is in a nanometer order (10-100nm) and is a magnetic structure with topological protection; the spin arrangement of the siganus oramin overcomes the limitation of the size of the traditional magnetic material, the reliability of stored information can be ensured, and the topological magnetic domain structure of the siganus oramin can enable current to interact with the siganus min to generate a topological Hall effect; the current density for driving the siganus oramin is 5 to 6 orders of magnitude lower than that for driving the traditional magnetic domain wall, so the siganus oramin is widely considered as an information carrier in a non-volatile spin memory device with the characteristics of high speed, high density, low energy consumption and the like, and is expected to be applied to a new generation of magnetic memory and spin electronics devices with high density and low energy consumption.

The traditional method for generating the magnetic skynerger is mostly complex in operation, utilizes spin polarized current, has low controllability and material selection range, does not have good antioxidant effect, and has low realizability; therefore, the invention provides a method for generating sigramins based on graphene and metal composite materials so as to solve the problems in the prior art.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide a method for generating seguinin based on a graphene and metal composite material, which can improve the controllability, material selection range, oxidation resistance, and realizability of a method for generating seguinin by adjusting the DMI value and PMA value between graphene and ferromagnetic material and the DMI value of a composite material layer to realize seguinin generation in a magnetic multilayer film structure and by injecting spin-polarized current into a current injection layer to generate seguinin.

In order to achieve the purpose of the invention, the invention is realized by the following technical scheme: a method for producing sigramins based on graphene and metal composites, comprising the steps of:

the method comprises the following steps: construction of magnetic multilayer film structures

Firstly, arranging a composite material layer CoPt on a substrate layer, then adding a ferromagnetic layer Co on the composite material layer, then arranging a graphene layer on the ferromagnetic layer, and finally arranging a current injection layer on the graphene layer, wherein the substrate layer, the composite material layer, the ferromagnetic layer, the graphene layer and the current injection layer jointly form a complete calculation model, and the substrate layer, the composite material layer, the ferromagnetic layer, the graphene layer and the current injection layer are at the same geometric center;

step two: production of siganmin

According to the first step, after the magnetic multilayer film structure is constructed, a spin-polarized current is injected into the current injection layer, the injection time is 0.5ns, the PMA value between the graphene layer and the ferromagnetic layer and the DMI value of the ferromagnetic layer and the composite material layer are adjusted, and finally, the sGermin is generated.

The further improvement lies in that: in the first step, the substrate layer, the composite material layer, the ferromagnetic layer, the graphene layer and the current injection layer are all disc structures, the radius of the substrate layer, the radius of the composite material layer, the radius of the ferromagnetic layer and the radius of the graphene layer are 100nm, the radius of the current injection layer is 10nm, and the thickness of the ferromagnetic layer is 0.4 nm.

The further improvement lies in that: in the first step, the substrate layer is a magnesium oxide insulating substrate, the composite material layer is a ferromagnetic and heavy metal layer, and the heavy metal layer is a Pt layer.

The further improvement lies in that: the ferromagnetism and the heavy metal act to generate a DMI value required for stabilizing the magnetic skynergen, and the graphene layer and the ferromagnetic layer act to form an adjustable DMI value and a PMA value.

The further improvement lies in that: in the second step, after the spin-polarized current is injected into the current injection layer, the ferromagnetic material and the heavy metal provide DM interaction due to giant spin orbit coupling, and after the spin-polarized current is injected, a skullet is generated.

The further improvement lies in that: in the second step, after the current injection layer injects the spin-polarized current, the graphene acts to generate a DMI value and increase a PMA value between the graphene layer and the ferromagnetic layer, and the current injection layer injects the spin-polarized current to successfully generate the sgemins.

The invention has the beneficial effects that: the method changes the DMI value and the PMA value in the model and the DMI value of the composite material layer by adjusting the thickness between graphene and ferromagnet so as to realize the generation of the Sgmelin in the magnetic structure, and the Sgmelin is generated by injecting spin-polarized current into the current injection layer; the structure DMI value and PMA value are better regulated and controlled by adding the graphene, nucleation of various magnetic structures is realized in a larger range, the graphene and the ferromagnet can induce larger DMI, the DMI does not need a nonmagnetic layer to have strong spin orbit coupling, and therefore the selection range of heterostructure materials is greatly expanded; in addition, due to the addition of the graphene, an anti-oxidation effect can be achieved on the metal layer, the graphene can be used as an active agent to be beneficial to the growth of the ferromagnetic layer, a multilayer film structure is formed, and the realizability is higher.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of the magnetic structure of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," "fourth," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example one

Referring to fig. 1, the present embodiment provides a method for producing sigramins based on graphene and metal composite materials, including the following steps:

the method comprises the following steps: construction of magnetic multilayer film structures

Firstly, arranging a composite material layer CoPt on a substrate layer, then adding a ferromagnetic layer Co on the composite material layer, then arranging a graphene layer on the ferromagnetic layer, and finally arranging a current injection layer on the graphene layer, wherein the substrate layer, the composite material layer, the ferromagnetic layer, the graphene layer and the current injection layer jointly form a complete calculation model; the substrate layer, the composite material layer, the ferromagnetic layer, the graphene layer and the current injection layer are in the same geometric center, and the substrate layer, the composite material layer, the ferromagnetic layer, the graphene layer and the current injection layer are all in a disc structure; the substrate layer, the composite material layer, the ferromagnetic layer and the graphene layer have a radius of 100nm, the current injection layer has a radius of 10nm, the thickness of the ferromagnetic layer is 0.4nm, the substrate layer is a magnesium oxide insulating substrate, the composite material layer is a ferromagnetic and heavy metal layer, the heavy metal layer is a layer of Pt, the ferromagnetism and the heavy metal act to generate a DMI value required by stable magnetic Sgmen, the graphene layer and the ferromagnetic layer act to form an adjustable DMI value and a PMA value, the adjacent magnetic moments are vertically arranged by the interaction of DM, the existence of DMI breaks the space inversion symmetry of a spin system, for example, different DM interactions are generated by spin-orbit coupling effects with different strengths through heavy metals with different thicknesses, different DMI values can be obtained between the graphene and the ferromagnetic layer due to Rashba effects with different strengths, and the anisotropy of the vertical magnetocrystalline is improved;

step two: production of siganmin

According to the first step, after the magnetic multilayer film structure is constructed, injecting a spin-polarized current into the current injection layer, wherein the injection time is 0.5ns, adjusting a PMA value between the graphene layer and the ferromagnetic layer and DMI values of the ferromagnetic layer and the composite material layer, and finally generating a sigramin; after the current injection layer injects spin-polarized current, the ferromagnetism and the heavy metal provide DM interaction due to giant spin orbit coupling effect, and after the spin-polarized current is injected, a Sgimenk is generated; unlike nucleation of magnetic structures in Co/CoPt structures, this is a vortex state where the nucleus is not in the same position as the center of the disk. The addition of the graphene enables the magnetic double-layer film to successfully generate the Starmine, after the current injection layer injects the spin-polarized current, the graphene acts to generate a DMI value and increase a PMA value between the graphene layer and the ferromagnetic layer, and the Starmine is successfully generated after the spin-polarized current is injected through the current injection layer.

Example two

Referring to fig. 1, the magnetic structure includes a current injection layer, a graphene layer, a ferromagnetic and heavy metal composite layer (made of cobalt and platinum as a composite material), and a substrate layer, under the action of current, a siglec is generated at the center of a magnetic nano disc, and the interaction value of DM (dzyaloshinski-Moriya) required for stabilizing the magnetic siglec, referred to as DMI value for short, is generated by the action of the ferromagnetic and heavy metal; coupling a ferromagnetic layer on the ferromagnetic and heavy metal composite layer through exchange coupling; the graphene layer and the ferromagnetic layer act to form an adjustable DMI value and a PMA (perpendicular magnetocrystalline anisotropy) value, the bottom of the magnetic structure is an insulating substrate, a magnesium oxide substrate is selected, and the whole magnetic structure forms a multilayer film disc model.

The generation of the siganus in the magnetic structure is realized by adjusting the DMI value and the PMA value between the graphene layer and the ferromagnetic layer and the DMI value of the composite material layer, the siganus is generated by injecting spin polarization current into the current injection layer, the current injection time is 0.5ns, and the relaxation time is long enough.

The ferromagnet and the heavy metal provide DM interaction due to giant spin orbit coupling; ferromagnetic layers and graphene also give rise to a DMI value; both DMI belong to the interfacial effect, but their spin-orbit coupled energy sources are located differently; in the heavy metal cobalt/platinum structure, DMI is largest in the cobalt layer of the interface ferromagnetic layer, and the giant spin-orbit coupling energy comes from the heavy metal Pt layer; but in graphene/ferromagnetic layers, the largest giant spin-orbit coupling energy and DMI are sourced from the nearest neighbor ferromagnetic layer; the DMI value plays a great role in the generation of the siganmin, and is a controllable parameter with various influence factors; the addition of graphene results in an increase in the PMA value of the graphene/ferromagnetic layer, i.e., skullet can be successfully generated in the structure.

Due to the exchange coupling effect, the magnetic moment structures of the upper layer and the lower layer are the same; the magnetic moments are different in magnitude due to the difference in saturation magnetization; the structure produces skyrmions, which increase in radius with increasing DMI and appear as 2 pi skyrmions, the kernel of which also increases with DMI.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.