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stabilisation of tetragonal feco structure with high magnetic anisotropy by the addition of v and n elements

by:Maghard      2020-02-29
Development of magnetic materials with high saturation magnetic strength (Ms)
And single-axis magnetic asymmetry (Ku)
Is to achieve high-
Performance permanent magnets capable of reducing power consumption of motors and data storage devices. Although FeCo-
Basic materials of the body
Central cubic structure (bcc)
The highest MS values are shown in various transition metal alloys, and their low Ku values make them unsuitable for permanent magnets. Recent first-
Principle calculation and experimental study show that the extended FeCo film with main body
Center Quartet (bct)
The structure and thickness of several nanometers show that the Ku value is cucj · M-3 due to the extension stress, which requires further stability.
In this work, the addition of a stable FeCo lattice via VN is characterized by the fact that the order of magnitude of high Ku is greater than that of M-3.
The obtained bct structure remains stable even for films deposited on amorphous substrates with a thickness of 100 nm, suggesting that it may be used in bulk systems.
The increasing power consumption of motors used in electric vehicles and air conditioners, as well as magnetic devices in hard drive and random access memory chips, has become a serious problem.
Permanent magnets are a very important part of these applications.
They are usually used in bulk in motor, actuator, and flux sources, and are used as film in storage and spin electronics.
Therefore, improving the performance of permanent materials is the simplest and most effective way to reduce its power consumption.
The energy used by these magnets depends on the size of the saturation magnetic strength ()
And single-axis magnetic asymmetry ()
The high thermal stability of the magnetic material can be achieved at a high value of the Curie temperature ().
The body\'s FeCo-centred cubic (bcc)
The structure is a well.
Known magnetic materials have the highest and very high values in various transition metal alloys. Although FeCo-
The base material has strong magnetic properties, and its size is low, which is not suitable for the manufacture of permanent materials.
However, if the value of the FeCo can be increased to a value high enough, one of the strongest permanent magnets can be obtained.
Results for the first time recently
The principle calculation predicts that the height of the FeCo and the body exceeds 10 ÷ j. m.
Center Quartet (bct)structure.
Normally, the bct grid is considered to be the intermediate structure between bcc and face-centred cubic (fcc)lattices.
This relationship is called Bain (bcc−bct−fcc)
The transition usually occurs in Markov materials.
In this respect, the bcc-bct-fcc transformation can be associated with a uniform ratio/correlation of lattice constants;
Bcc cell/1.
0, the fcc is.
In the equilibrium phase diagram constructed for FeCo, the fcc phase is stable at temperatures above 1258 k.
Its transition to the bcc phase occurs at a lower temperature, resulting in CsCl-type (2)
An ordered bcc structure at temperatures below 1003 µk without the generation of bct intermediates.
However, after considering Bain\'s transformation, two methods can be used to stabilize the bct structure :(A)
Applying a single-axis stress to the FeCo lattice through an extension effect, and (B)
Add a third element to the FeCo structure.
A variety of experimental studies were conducted based on Method A, and the magnetic heterogeneity of FeCo was studied by extending the growth of FeCo on several Rh, Pd, Ir, Pt or CuAu buffer layers, this was chosen because the appropriate mismatch between the buffer layer and the FeCo film produced the bct structure.
The results of these studies show that the magnitude of the experiment exceeds 10 j. m when the/~ 1 of FeCo is present.
2, consistent with theoretical predictions.
However, with the increase of the thickness of the film, structural relaxation occurs rapidly in the film grown by the extension and in the bct structure with the u2009 = u2009 1.
2 only in thickness ()of 1–2u2009nm.
Some experimental studies were also carried out based on the B method.
The addition of certain third elements is expected to produce macroscopic Foursquare deformation in the FeCo lattice, resulting in local stress relaxation near it.
B, C, and N represent typical clearance elements that are widely used in the manufacture of Foursquare Fe-based alloys.
For example, Finn reports that the complex of the quartet will . . . . . . = u2009 1. 1 and u2009=u20090. 45u2009×u200910u2009J·mu2009. In FeCo-based alloys, (FeCo)−(B, C, N)(yu2009≥u20090. 7)
u2009 = 300 u2009 nm thin film deposited on magnesium substrate was studied and in Fe-rich regions. The (FeCo)
The C film deposited on the Au Cu buffer layer is characterized by a velocity = 1001. 03 and u2009=u20090. 44u2009×u200910u2009J·mu2009.
The film of = u2009 23 FeCoTiN will . . . . . . .
The exhibition will be at 5 nm . . . . . . = u2009 1. 08 and u2009=u20090. 57u2009×u200910u2009J·mu2009.
However, for FeCo-
Base alloy, no value of about 1.
2 has been achieved.
In our previous study, we focused on using vanadium as a third additive element because it was able to form a bcc solid solution around the FeCo cluster, followed by an increase in V content, into an fcc phase.
The stability of the Bct phase is expected to occur at the boundary between the bcc and fcc phases.
In addition, FeCo compounds containing 8-20 hexat. % V (
Called vicalloys)have semi-
Hard magnetic properties with a value of 0. 03–0. 05 T. FeCo-
Contains base material less than 10 u2009.
% V is called Type I vicalloys (Typical FEV)
And those who are 10-20 Bharat.
% V is called Type II vicalloys (Typical FEV).
The magnetic hardening mechanism of these alloys has not yet been fully clarified.
Five possible factors can be considered :(1)
Fix the domain wall in a non-
Magnetic precipitation or reverse in 2
Phase ,(2)
The shape of the Bcc phase is heterosexual ,(3)stress-
Induce the opposite sex ,(4)
Magnetic asymmetry of the Martensitic needle, and (5)
Magnetic heterogeneity of two ordered bct deposits.
Earlier, it was reported that
The hard magnetic properties of Vicalloys are mainly attributed to the fifth factor (
There is a square distorted precipitation or cluster in the Bcc-bct-fcc conversion process)
Through the formation of bct phases, they may be potentially improved.
Even though the expected V of join Will stable bct stage but check. Of FeCoV and fecovc film can\'t to u2009 = u2009 1. 2.
In this study, the effect of VN addition in the FeCo film on its square deformation and magnetic properties was investigated.
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