Need Spin Wave Generator Circuit Design

[forex10]

Hello,
I have found the technology of spintronics very interesting with a great potential for the (hopefully near) future & I am desiring to experiment with spin waves. I am sure there are several ways to create a spin wave or current, one of which involves placing a platinum strip at the end of a magnet. However since platinum is expensive I was wondering if there is a discrete circuit that could generate spin waves? Thanks for any help.
Joel

 

[scottdave]

Well i found this article (since i didnt know what a spin wave was till now).
https://www.uni-muenster.de/Physik.AP/Demokritov/en/Forschen/Forschungsschwerpunkte/mBECwasw.html
There were some more articles. It looks interesting. I need to do some reading.

 

[Tom.G]

Well i found this article (since i didnt know what a spin wave was till now).
https://www.uni-muenster.de/Physik.AP/Demokritov/en/Forschen/Forschungsschwerpunkte/mBECwasw.html
There were some more articles. It looks interesting. I need to do some reading.

That sounds suspiciously like the basis of MRI (Magnetic Resonance Imaging), which is based on NMR (Nuclear Magnetic Resonance). In NMR, though, it is the Protons in the Nucleus that are precessing in a magnetic field.

 

[dlgoff]

[off topic, slightly]

... which is based on NMR (Nuclear Magnetic Resonance).

In college, I worked in a lab where we studied spin-spin interactions. Samples were placed between the pole faces of a huge electromagnet with a microwave guide going into provide RF energy to bring the electron axis out of precession. NMR
[/end off topic]

 

[Baluncore]

Several books on the subject of Spintronics have been produced in the last 10 years.
See; https://en.wikipedia.org/wiki/Spintronics

 

[forex10]

dlgoff I wish I could find something like that. What I am going to try is to connect a platinum strip to a magnet, then when current is applied to the strip a spin wave comes out the other end of the magnet. A platinum ingot costs a huge amount of money, but a platinum strip is not so high of cost. It would be nice to have a visualization of this but if I can find a platinum strip I think I can manage it.

This is not a homework project & it is not my intent to apply this to an mpu or spin memory project. My aim is for more of a larger scale application like power or signaling. Also thanks for the responses & more would be welcome.

Joel

 

[anorlunda]

Where did you get the idea that platinum is required? The Wikipedia article says any metal will do.

 

[Baluncore]

What I am going to try is to connect a platinum strip to a magnet, then when current is applied to the strip a spin wave comes out the other end of the magnet. A platinum ingot costs a huge amount of money, but a platinum strip is not so high of cost. It would be nice to have a visualization of this but if I can find a platinum strip I think I can manage it.

It seems to me that spin wave devices are microscopic semiconductor structures with layer thickness measured in nm. Where is there a reference to an expensive macroscopic lump of platinum being used experimentally ?

 

[Baluncore]

The biggest example I have seen involves large area Pt films with thickness = 15nm.
Here is an extract from ... Recent Advances in Magnetic Insulators, from Spintronics to Microwave Applications. Mingzhong Wu & Axel Hoffmann (Eds), 2013.
2.1.3 Electric Signal Transmission in Ferrimagnetic Insulator via Spin-Wave Spin Current. Page 8.

Figure 1.5 (a) A schematic illustration of the experimental setup. The sample is a 1.3-mm thick single-crystalline YIG (111) film on which two separate 15-nm thick Pt films (Pt (i) and Pt (o)) are attached. The surfaces of the YIG layer, the Pt-film (i), and the Pt-film (o) are 35 mm2, 27.5mm2, and 0.5 mm2 rectangle shapes, respectively. The distance between the voltage electrodes attached to the Pt-film(o) is 5 mm. (b) Voltage difference V between the ends of the Pt-film (o) as a function of the charge-current density Jc in the Pt-film (i) at H¼2.3 kOe, measured when the magnetic field was applied along the y¼0 or 180 direction.

 

[forex10]

Where did you get the idea that platinum is required? The Wikipedia article says any metal will do.

The first articles I came across all included either platinum or graphene as part of the method to produce spin waves . I now have found out there are at least several other, if not many materials to use.