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unlocking bloch-type chirality in ultrathin magnets through uniaxial strain

by:Newland     2019-10-30
The hand-Levy magnetic domain wall has aroused great interest because it improves the left-and right-
Hand spin texture in the magnetic domain wall enables fast current-
Domain wall propagation driven.
Although it is known that there are two types of magnetic domain walls in the magnetic film, Bloch-and Néel-
Wall, so far, the stability of homosexuality is limited to Niel-
Type domain wall.
Self-thin driving mechanism-
It is believed that the magnetic hand sign of the film, interface Dzyaloshinskii-Moriya interaction in Bloch-
Types of walls, the walls of hombloch are still elusive.
Here we use real-
Spatial Imaging of the spin texture of the iron/nickel double-layer film on tungsten shows the hand sign domain wall of mixed Bloch-type and Néel-
In the presence of interface Dzyaloshinskii-Moriya interaction, the type can indeed be stable by adding a single-axis strain.
We introduced Bloch to our findings.
As a new spin texture, it opens up a new opportunity for the design of spin orbit devices. The W(110)
Clean the substrate by flashing at 3 × 10 tortorr O at 1,950 °c and finally annealing at ultra-high vacuum with base pressure of 4 × 10 tortorr at 1,900 °c
Special price for calibration and monitoring of Fe and Ni film thickness
Energy electron microscope (LEEM)
Image intensity oscillation related to atomic layerby-layer growth.
The Fe and Ni layers are grown by electron beam evaporation at 300 µk, and after a single layer of Ni is grown, the samples are annealing to 900 µk for a few minutes to form a good-
Order the interface.
Two LEEM images ,(, )and (, )
, Is obtained by the spin of the illuminated beam aligned and opposed to the selected polarized shaft.
We usually use the image integration time of 1 s.
LEEM images are used to calculate spleen asymmetry (, )=((, )−(, ))/((, )+(, )).
Asymmetric value (, )
In pixel coordinates (, )
In the SPLEEM image, proportional to the projection of the magnetized vector (, )
Samples on the selected polarization axis ,(, )~((, )·).
We select three orthogonal vectors and form a Descartes coordinate system perpendicular to the surface of the sample.
Of the three sets of SPLEEM images displayed from it, each set to be one of the three components that are parallel to the sample surface coordinates, and the direction of the magnetized unit vector can be determined at all pixel coordinates. To obtain low-noise three-
Dimension vector field (, )
For this study, we aligned and averaged 40 such images of external componentsof-
Plane direction ()
And 100 for each in-
Plane direction (, ).
To represent these vector images in color, we will
Hue and out-plane angle onof-
Plane component of image brightness ().
In order to get a higher contrast in DWs, out-of-
The flat domain is reduced to 50%.
The center line of the DWs is determined by the threshold, in (, )
= 0 and subtract the threshold image from its binary expansion.
The DW normal vector is evaluated by applying a Gaussian blur with a width of 2px and then two-
The size gradient on the center line.
Direction determined (, )
We\'re right (, )=((, ),(, ),0)/((, )+(, ))
Therefore, the blurring of the strong signals of components overlapping with DW does not add noise to the data. Determining (, )from single-
Pixel center line and three-, five-and seven-pixel-
Across the wide ribbon of the DW center line, we find the histogram, characterizing the DW magnetized direction as a function of the angle, and almost the same;
Therefore, we use DW centerline pixels in our analysis.
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