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Regulatory approaches to skyrmions in the hexagonal mnniga

A magnetic field and strip technology, applied in the field of regulation of skyrmions, can solve problems such as narrow temperature range, lack of zero-field stability, and disappearance of skyrmions

Active Publication Date: 2018-12-21
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although high-density skyrmion lattices can be formed in these materials, a continuous magnetic field is required to make them exist stably, and the Curie temperature of these materials is lower than room temperature, and the skyrmion formation temperature region is narrow (only in Stable in the range of a few K near the Curie temperature)
[0004] Symmetrically in the center La 1.4 Sr 1.6 mn 2 o 7 In the material system, a skyrmion lattice with a topological number of 2 has been observed, but it still needs to exist stably at a low temperature of 70K and has a narrow temperature range
[0005] We found that skyrmions with a topological number of 2 can be formed in the MnNiGa material system. Although they exist in a wide temperature range from 100K to 340K, their density is very low far away from the Curie temperature (for example, at room temperature), and high density storage
Moreover, when the magnetic field is withdrawn, the formed skyrmions will disappear and do not have zero-field stability

Method used

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  • Regulatory approaches to skyrmions in the hexagonal mnniga
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  • Regulatory approaches to skyrmions in the hexagonal mnniga

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Experimental program
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Effect test

Embodiment 1

[0035] 1) Preparation (Mn 50 Ni 50 ) 65 Ga 35 Sample: will (Mn 50 Ni 50 ) 65 Ga 35 The sample block was cut into rectangular pieces of 3 mm x 2 mm. In order to facilitate the direct observation of nano-sized skyrmions under the transmission electron microscope, the observation area of ​​the sample was polished by sandpaper, pitter and polisher, and then thinned by an ion thinner, so that the thickness of the observation area of ​​the sample was less than 100 Nano. Mount the sample with the thinned observation area on the electric field rod and insert it into the transmission electron microscope. Among them, the current can be applied to the sample through the Keithley ammeter, and the required magnetic field can be generated by the objective lens current of the transmission electron microscope, and the (001) crystal plane of the sample can be regulated as follows through the transmission electron microscope.

[0036] 2) Vertical (Mn 50 Ni 50 ) 65 Ga 35 A magnetic ...

Embodiment 2

[0041] It is basically the same as Embodiment 1, the difference is that in step 2) a magnetic field of 10mT is applied (this magnetic field is not enough to make the hexagonal (Mn 50 Ni 50 ) 65 Ga 35 Strip magnetic domains in the transition into skyrmions). figure 2 is the magnetic domain structure diagram of the skyrmion obtained according to the above control method. After removing the external magnetic field, it is found that the formed skyrmions can still be stored stably, with non-volatile zero-field stability. Will (Mn 50 Ni 50 ) 65 Ga 35After the temperature is increased from room temperature to 330K or decreased to 100K, it is found that skyrmions can still exist stably, so the regulation method of the present invention forms skyrmions at room temperature in a wide temperature range.

Embodiment 3

[0043] It is basically the same as Embodiment 1, the difference is that in step 2) a magnetic field of 30mT is applied (this magnetic field is not enough to make the hexagonal (Mn 50 Ni 50 ) 65 Ga 35 Strip magnetic domains in the transition into skyrmions). image 3 is the magnetic domain structure diagram of the skyrmion obtained according to the above control method. After removing the external magnetic field, it is found that the formed skyrmions can still be stored stably, with non-volatile zero-field stability. Will (Mn 50 Ni 50 ) 65 Ga 35 After the temperature is increased from room temperature to 330K or decreased to 100K, it is found that skyrmions can still exist stably, so the regulation method of the present invention forms skyrmions at room temperature in a wide temperature range.

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Abstract

The invention provides a regulation and control method for a Skyrmion in a hexagonal MnNiGa. The regulation and control method comprises the following steps of 1) applying a magnetic field to the hexagonal MnNiGa, wherein the magnetic field is not strong enough to convert a strip-shaped magnetic domain in the hexagonal MnNiGa into the Skyrmion; and the direction of the magnetic field is not parallel to a family of crystal plane [001] in the hexagonal MnNiGa; and 2) applying a current to or / and heating the hexagonal MnNiGa to enable the strip-shaped magnetic domain to disappear. By virtue of the regulation and control method, a high-density Skyrmion array is formed in the hexagonal MnNiGa material system; and in addition, the high-density Skyrmion can exist in both of a null field and a wide-temperature-range room temperature.

Description

technical field [0001] The invention relates to a method for regulating skyrmions, in particular to a method for regulating skyrmions in hexagonal MnNiGa. Background technique [0002] Magnetic skyrmion is a kind of magnetic structure with topological behavior. It has a particle character and its size is on the order of nanometers (10-100 nanometers). The spin arrangement of magnetic skyrmions makes the current density driving skyrmion state changes 5-6 orders of magnitude lower than driving conventional magnetic domains, so it is expected to be applied in high-density, high-speed, low-energy magnetic information storage devices. [0003] At present, the formation of skyrmions has been directly observed in the non-centrosymmetric structure material system by Lorentz transmission electron microscopy. Although high-density skyrmion lattices can be formed in these materials, a continuous magnetic field is required to make them exist stably, and the Curie temperature of these ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/01H01F13/00
CPCH01F1/009H01F1/01H01F13/00
Inventor 张颖彭丽聪王文洪吴光恒蔡建旺沈保根
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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