The Physics
Factbook
An encyclopedia of scientific essays

Curie Temperature of Cobalt

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Chapter 19, Magnetic Effect. The Physics On-line Research Textbook "Table 19-1
Curie Points of Ferromagnetic Elements
Iron - 770 C
Cobalt - 1131 C
Nickel - 358 C
Gadolinium - 16 C"
1404.2 K
Magnetically Assisted Gasification. UMPQUA Research Company. "Cobalt, with a Curie temperature of 1121 C, is clearly superior from the standpoint of high temperature operation." 1394.2 K
How to Select the Appropriate Material, TECH Notes [pdf]. Arnold Magnetics, December 2004. "Samarium cobalt also has a high curie temperature. There are two grades: the 1:5 alloy which has a curie temperature of 750 and the 2:17 alloy which has a curie temperature of 825 °C." 1023.2 K, 1098.2 K
Aspden, Harold. Magnetocaloric Motor Power. 29 January 1997. "If it were of Cobalt that would mean 1127 degrees C." 1400.2 K

Not many people know much about magnetic materials. It's not usually a topic that comes up a lot in conversations. Magnetic Materials vary, they are either ferromagnetic, antiferromagnetic or ferrimagnetic. The pure metal, Cobalt, is a ferromagnetic material. Ferromagnetic materials are made up of domains which align with the magnetic field. Cobalt, is a "hard" metal along with the other ferromagnetic materials. "Hard"meaning they require high magnetic fields to demagnetize or to reverse the polarity of magnetization.

One of the most important physical properties of magnetic materials is their Curie temperature. The Curie temperature represents the point at which thermal energy is able to overcome the applied magnetic field and randomize the ferromagnetic domains. The Curie temperature of 1121 for Cobalt, shows that is definitely superior during a high temperature operation.

Cobalt, a chemical element with the atomic number 27. Cobalt has a grayish, metallic tint to it is often found in foil, powder, rod, and wire. It was discovered in 1737 and has a had a significance in the universe, with large amounts found in many places. Cobalt can be found in places such as Canada and Africa, and also in meteoroids. Bet you didn't know that? So next time you are in Africa or on a small trip to Mars and you pass a meteoroid make sure you stop and find some cobalt.

Yasmin Sinclair -- 2005