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From: Bill Sloman <bill.sloman@ieee.org>
Newsgroups: sci.electronics.design
Subject: Re: Yttrium iron garnet
Date: Thu, 30 May 2024 22:50:09 +1000
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On 30/05/2024 7:14 pm, Cursitor Doom wrote:
> On Thu, 30 May 2024 15:45:21 +1000, Bill Sloman wrote:
> 
>> On 30/05/2024 3:37 am, john larkin wrote:
>>> On Wed, 29 May 2024 17:12:21 -0000 (UTC), Cursitor Doom
>>> <cd999666@notformail.com> wrote:
>>>
>>>> On Wed, 29 May 2024 13:52:34 +1000, Bill Sloman wrote:
>>>>
>>>>> Yttrium iron garnet tuned oscillators were around back then, but
>>>>> their 2GHz to 8GHz range was too high for me to count with the
>>>>> integrated circuits around then - we had to go the Gigabit Logic's
>>>>> GaAs parts to get to 800MHz, and that became the unique selling point
>>>>> of the system.
>>>>
>>>> YIG oscillators were quite the thing back in the day, but I'm guessing
>>>> they've been completely superseded by now to get to ever higher
>>>> frequencies. Seems we've gone from -
>>
>> This misses Jan Panteltje's thread "Small magnetic tunable filter for 6G
>> and beyond" which is about Yig being used today.
> 
> That article makes it seem like YIG is some revolutionary, new, emerging
> technology!

Of course it does. University researchers always want to create that 
impression.

https://www.nature.com/articles/s41467-024-47822-3

does emphasis how their technique differs other's peoples schemes to 
exploit an effect which has been around for quite a while. The idea of 
electrically thumping and Al-Ni-Co permanent magnet to get it to deliver 
precisely the static magnetic field you for as long as you want it is 
neat, but perhaps more problematic than the authors admit.

They may need to add a Hall plate to their stack to keep track of the 
actual magnetic field where it matters.

-- 
Bill Sloman, Sydney