Some Magnetic moments are permanent dipole moments within the atom which originate from electrons' angular momentum and spin. Those materials have different structures of intrinsic magnetic moments that depend on temperature. At a material's Curie temperature those intrinsic magnetic moments change direction. Thus, Curie temperature is a physics property of a magnetic material. The XacCryo can be used to measure the Xac with different temperature between 77K to room temperature. It is a useful device to research the Xac of a magnetic material between its Curie temperature.