MEMM

[Kator01]

Hellp PaulL,

this link might be of interest : Magnetocaloric effect in dysprosium

Dysprysium is a rare earth element. See wikipedia :

http://en.wikipedia.org/wiki/Dysprosium

http://www.osti.gov/energycitations/product.biblio.jsp?osti_id=6298920

Kator

[PaulLowrance]

Hi Kator01,

Thanks for the links. Dysprosium looks nice for certain conditions. Dy used to be ridiculously expensive, but it's dropped like a rock lately-- roughly the price of silver.  It's probably a wee too expensive for common folks, but who knows at the rate it's dropping.

MnZn is a relatively cheap and has been used for for its room temperature Curie point. Hopefully in next few days I'll be testing some Amidon cores, which have some MnZn. Two of their best cores have Curie temperatures down to 120 C.

Another factor that improves MCE energy is the typical domain size of the material at room temperature. That why I really need to test a good Metglas core. So far I think it will be one of the best core materials for MEMM. Although Metglas is not that cheap is it?


Regards,
Paul Lowrance

[dean_mcgowan]

Yttrium ?

Is this another possible substitute ?

Expensive, yet exhibits many rare earth properties.

[PaulLowrance]

Thanks for info dean.  I found some very interesting core materials at :

http://www.cmi-ferrite.com/Products/Products%20Materials.htm

Some of the materials have first stage curie points as low as -25 C!  The following materials seem promising: MN67, N40, MC25, CMD5005

Hopefully they can ship me 1 of each at a reasonable price, and we'll see

Regards,
Paul Lowrance

[FreeEnergy]

http://www.ryde.net/theo/mcaloric.html