Need Spin Wave Generator Circuit Design

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Discussion Overview

The discussion revolves around the design of a circuit to generate spin waves, a concept within the field of spintronics. Participants explore various materials and methods for creating spin waves, including the use of platinum and other metals, while expressing interest in both theoretical and practical applications.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant expresses interest in experimenting with spin waves and inquires about discrete circuits for generation, mentioning the use of platinum strips.
  • Another participant shares an article about spin waves, noting its connection to MRI and NMR, indicating a need for further reading.
  • A participant reflects on their experience with spin-spin interactions in a lab setting, providing context about the use of electromagnets and RF energy.
  • Several participants mention the availability of literature on spintronics, suggesting that there are multiple resources for understanding the topic.
  • One participant proposes using a platinum strip connected to a magnet to generate spin waves, while clarifying that their project is not for homework or specific applications like memory projects.
  • Another participant questions the necessity of platinum, referencing a Wikipedia article that suggests any metal could suffice for generating spin waves.
  • A participant challenges the idea of using large macroscopic pieces of platinum, suggesting that spin wave devices are typically microscopic semiconductor structures.
  • One participant cites a specific example involving thin platinum films in an experimental setup, providing details about the materials and measurements involved.
  • Another participant acknowledges the initial belief that platinum was required but later discovers that multiple materials can be used to produce spin waves.

Areas of Agreement / Disagreement

Participants express differing views on the necessity of platinum for generating spin waves, with some asserting it is required while others argue that various metals can be used. The discussion remains unresolved regarding the optimal materials and methods for spin wave generation.

Contextual Notes

There are limitations regarding the assumptions about material requirements and the specific conditions under which spin waves can be generated. The discussion includes references to both theoretical and experimental contexts, but no consensus is reached on the best approach.

forex10
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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
 
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scottdave said:
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.
 
[off topic, slightly]
Tom.G said:
... 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]
 
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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
 
Where did you get the idea that platinum is required? The Wikipedia article says any metal will do.
 
forex10 said:
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 ?
 
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.
 
  • #10
anorlunda said:
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.
 

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