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atomic structure and domain wall pinning in samarium-cobalt-based permanent magnets

by:Maghard      2020-02-24
Increasing the iron content to obtain a higher saturation magnetic strength is critical for producing a larger energy product in rare casesearth Sm2Co17-type pinning-
Control permanent .
These are important.
Temperature industrial applications due to its inherent corrosion resistance and temperature stability.
Here we propose a unique nano-structure based on-
Chemical modification routes using Fe, Cu, and Zr as impurities.
Iron content controls the formation of diamonds.
The density and strength of the dominant domain wall pinning site determine the honeycomb structure of the shape of the . Using ultra-high-
By distinguishing experiments and theoretical methods, we reveal the atomic structure of the single phase presented and establish a direct correlation with macroscopic magnetism.
With further development, this knowledge can be applied to the production of samarium Cobalt Permanent Maghard Flexible Magnet Materials with better magnetic properties. Pinning-
Controlled permanent operating at high temperature improves the device performance of the
Based on industrial applications.
Includes tube, gyro and accelerometer for controlling and stabilizing satellites, magnetic bearings, sensors and actuators, reaction wheels and momentum wheels. Sm(Co,Fe,Cu,Zr)
It is an important system of materials for industrial use, because it has high Curie temperature and high magnetic crystal heterogeneity.
Different from shaped nucleuscontrolled Nd-Fe-B-
SmCo based on permanent -
Type maintains its excellent magnetic properties at high temperatures.
In order to accurately control the synthesis parameters to obtain such high magnetic properties, it is necessary to have a deep understanding of the atoms-
The scale structure and behavior of the phases involved.
This is not a simple task, although the relationship between microstructure and chemistry and magnetism has been extensively studied through local techniques such as electron microscopy, the number of atoms
The scale of the survey is still limited.
Iron content has a significant effect on the magnetic properties of Sm (Co,Fe,Cu,Zr)
Permanent .
Hadjipanayis and others showed it.
For samples with iron content between 15 and 20 wt %, the optimal magnetic strength was obtained.
With the increase of Fe content, the cell structure changes from uneven to larger but uniform cell size (~120u2009nm)
And, finally, a rough and uneven microstructure.
Iron is preferred to replace cobalt in the 2: 17 phase and is responsible for saturation magnetism.
Due to the maximum domain wall energy in the cell boundary stage (
Later called SmCo or 1:5 stage)
, This phase is the main nail center of the magnetic domain wall.
According to Skomski and others. Zr-rich (Z-phase)
Platelets contribute to the formation of cell boundaries and do not make any major contribution to the , but may still act as a nail center. Skomski et al.
And Katter and others.
The predicted domain walls will be severely bent until they reach the interface between 2: 17 and 1: 5 stages.
However, the pinning force on this straight interface is much higher than the observed mandatory force.
Therefore, on some weak points, the depth of the field Wall determines the .
These weaknesses are the edge of cell 2: 17 and the 1: 5 Phase vs Z-phase.
On the plane interface between the 2: 17 cell and the 1: 5 boundary phase, the domain wall is strongly fixed.
Below, we propose a detailed investigation of Z-at the atomic scale-
Phase and its contribution to the domain wall-
DingTalk behavior.
We come up with a more favorable 2: 17 or Z to move these weaknesses of short domain walls from a positive perspective
The phase of 1: 5 is longer than pressing its long part to the plane interface.
This means that the domain wall is not only nailed to the interface of the plane 1: 5 to 2: 17, but it is also first at the edge of the cell, then at 1: 5 and Z-phase.
In order to clarify the atomic structure of the z phase and its contribution to the magnetized process, we use the combined atoms-
Structure Research, microstructure
Calculation based on micro-magnetic simulation and density functional theory.
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