Spin-orbit torques in a Mn2Au/HM bilayer

Wuzhang Fang Author

04/04/2021 Added

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We employ first-principles calculations study the spin-orbit torques in Mn2Au/HM bilayer and discuss the effects on magnetization dynamics.

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[00:00:01.920]Hi, this is [inaudible] from department of physics.
[00:00:05.700]My other wiser is professor Curio blast Shanko.
[00:00:09.120]My topic today is first principles calculations Oaks in RV parks
[00:00:14.370]in Edmond, Goldman, and the hand metal ballet
[00:00:18.330]spin RV parks provide that efficient,
[00:00:20.550]that anniversary of hallways for control the magnetic state and the dynamics in
[00:00:24.510]mind. I think materials it is originating from CB.
[00:00:29.280]I'll be copying it as this form. It can be useful. The magnetization switching,
[00:00:34.380]high frequency, oscillations domain worse,
[00:00:37.890]and the squirmy on motion and the spin by excitations.
[00:00:43.200]A lot of studies of spin RV parks have been focused on the
[00:00:47.610]pharmacokinetics in this presentation.
[00:00:50.400]I would focus on the anti-foreigner magnetic AI effects yeah.
[00:00:56.490]Are robust against the participation due to magnetic fields.
[00:01:01.110]They produce no straight fields they display,
[00:01:04.110]which are foster the dynamics and are capable of generating large monumental
[00:01:08.970]transforming effect.
[00:01:11.370]The idea of the spinoff we talk in AFM is,
[00:01:16.080]is that the current induced stance has been density,
[00:01:18.930]produced a park that acts locally.
[00:01:23.460]So for a colinear, uh, AFM,
[00:01:26.550]we have seven at his age and then the Sunday speak.
[00:01:29.520]And there are two common terms. One is called a few and a term Ryan's content.
[00:01:33.720]And I term the both of them have been realized
[00:01:38.820]experimentally, uh,
[00:01:40.680]to switch the magnetization in AFM,
[00:01:46.380]the material will be asked studying, studying.
[00:01:48.840]They is [inaudible] at a high it's, a high,
[00:01:53.790]you know, temperature about salt and the K and that you paste has, uh,
[00:01:57.660][inaudible] is a combination of inversion and Tyreek time of river
[00:02:02.220]reversal symmetry. It is the first predictor of the best theory that it,
[00:02:07.320]uh, these particular synergy, uh,
[00:02:09.720]under the actually field theory will be a current induced stacker field.
[00:02:15.120]Um, each satellite is on since the night am I,
[00:02:17.910]in addition is outside the stacker.
[00:02:21.010]The field view produce the non stacker field,
[00:02:24.660]which is efficient for the magnetization switching on the
[00:02:29.460]another type of pocket that thumping. I talk also has been shown, uh,
[00:02:33.690]con uh, kind of induce the switching,
[00:02:37.620]the manage position, switching in this concrete,
[00:02:41.760]we employed the first beautiful calculations to study this,
[00:02:45.750]being able to work in a bi-layer system. So we add, uh,
[00:02:50.040]Heidi Manto on top of this and the DISA discuss his effect on the
[00:02:55.110]magnetization dynamics. The mice are,
[00:02:58.840]we are using is first principle calculations based on the
[00:03:03.940]EGF formula, leaves them.
[00:03:06.160]So basically we calculate the ten-speed magics and their talk
[00:03:10.960]operator, take the chase out them. We can park
[00:03:14.950]the wealth allows the advantage of this master is we can treat the disorder
[00:03:19.990]X please study because the material in real world is
[00:03:24.700]a non-perfect. There will be some disorders. We use this,
[00:03:29.090]this other strengths upon 68,
[00:03:32.770]it can be [inaudible] or a towel microbiome centimeter,
[00:03:37.600]and that it is comparable to the experimental value.
[00:03:40.330]It is plenty like her own second, meet her eye temperature,
[00:03:45.490]the stuffers that hobbies like this. So we have a very sick, uh,
[00:03:49.280]mental gold layer.
[00:03:51.220]And then we have six long layer of the high metal,
[00:03:54.730]high men who can be tungsten or platinum. The,
[00:03:57.820]you actually feel that is applied in this direction and that high
[00:04:02.500]metal real January does the current along these directions. Also,
[00:04:07.510]as I mentioned earlier,
[00:04:09.820]the carbon debut will also generate the
[00:04:14.290]stacker, uh, spin density. Um,
[00:04:19.540]each supplier lesbian sold the resort.
[00:04:23.590]So we calculated feel like Tara and the Tempe like pork and the fuel
[00:04:28.480]hectare in the middle is basically constant.
[00:04:32.380]And it has a larger radio and the [inaudible] and has a
[00:04:37.330]smaller radio near the interface. It is larger than the needle.
[00:04:43.180]Uh, we want to study the mechanics of this avatar.
[00:04:47.560]So we turn off this new company on the mental goal. As I mentioned,
[00:04:51.430]as being avatar, they are originated from the spin opera company.
[00:04:56.440]So we turn off this spin competent here.
[00:04:59.170]So we can expect that this right now, the car in the January,
[00:05:03.970]from the high tomato gonna play an important role.
[00:05:07.030]So as we can see that near the interface, the smell of the car is zero,
[00:05:12.400]and that remains sizeable even 20 mamma layers away from the interface.
[00:05:17.110]This implies the spin current, the country penetrate,
[00:05:19.960]penetrate the film very deeply.
[00:05:23.230]A full compression would be replaced the function by the platinum because we
[00:05:27.370]know the platinum is a good spin
[00:05:31.930]current generator. Also,
[00:05:33.580]it has a difference in her ankle compared to the toxin.
[00:05:38.980]Uh, overall it's all similar,
[00:05:42.190]except the near the inter near the interface.
[00:05:44.650]At least the platinum is kind of different because they are
[00:05:49.440]different height metal, uh,
[00:05:51.790]to better interpret our resort.
[00:05:54.520]We define the non stagger in avatar and the stacker it's being all retarded as
[00:05:59.510]this.
[00:06:00.260]So basically some on difference of the park in the neighboring site,
[00:06:06.860]uh, we sold a result here. So for the champion, like park,
[00:06:10.970]the [inaudible], uh,
[00:06:14.750]here on the land, zero near the interface, uh,
[00:06:19.880]staggered dumping like tar is non-zero.
[00:06:22.850]So all the films feel, not park. The non stagger,
[00:06:26.810]a you like target is large and constant in the middle.
[00:06:31.700]And the really large compared to the staggered.
[00:06:35.640]If you want to talk on the front of the previous studies,
[00:06:38.360]and we know that [inaudible] has been out of the park,
[00:06:40.340]easy Hans by the large internal exchange park and the kind of
[00:06:44.750]efficiently drive the [inaudible] dynamics on
[00:06:49.670]the stacker
[00:06:51.980]tsunami park is not assisted by this internal torque,
[00:06:56.300]therefore not efficient. And therefore we expect,
[00:07:01.040]except that the non-stat GERD is feeling like they're going to dominate the
[00:07:04.920]dynamics who conclude this presentation.
[00:07:08.840]We calculate the layer resolved, uh,
[00:07:11.240]sot of a I'm an [inaudible].
[00:07:15.890]We calculate a damping like torque and a few like, uh, feeling like part.
[00:07:21.290]We, we got the idea that a speeding car,
[00:07:24.320]independent Penner penetrating into the film are deeply on the non stagger
[00:07:28.940]field. Our car is large
[00:07:31.700]in the back region on the interfacial NASDAQ or target is, uh,
[00:07:37.070]uh, [inaudible] near only near the interface.
[00:07:42.110]And the, the dynamics of the magnetizations is dominated by the
[00:07:47.510]metal stagger,
[00:07:48.140]a few laptop in single domain domain picture sound for
[00:07:52.880]attention.

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Spin-orbit torques in a Mn2Au/HM bilayer

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