How / Why do Ferrite Choke filters work?

[vinlove]

Hi All

Just had a great success of reducing / getting rid of RFI and hum from the Samsung plasma TV in the house on my MW and HF bands reception by adding some 20 of small ferrite chokes.
2x packs of 20 ferrite chokes costed me about 30 Euros total.
 
Please refer to the separate thread on the topic.
But my question is, how does Ferrite Choke filters work?
They seem really effective on RFI and hum problem solution for MW HF radios.

What does the material Ferrite do?
Are there any other material which do the same thing as the Ferrite?

[Grandchuck]

https://resources.altium.com/p/how-do-ferrite-beads-work-and-how-do-you-choose-right-one#:~:text=When%20a%20ferrite%20bead%20choke%20is%20placed%20on,such%20as%20that%20from%20a%20switched-mode%20power%20supply.

[vinlove]

Great presentation and info on the topic.
Thanks for the link. 

[jfitzgerald]

Chuck Councilman has an excellent article on the subject.   See http://www.yccc.org/Articles/W1HIS/CommonModeChokesW1HIS2006Apr06.pdf