α Js = J sΘ − J sref J sref ( Θ− Θ ref ) MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaeaaciWacmGadaGadeaabaGaaqaaaOqaaiabeg7aHnaaBaaaleaacaWGkbGaae4CaaqabaGccqGH9aqpdaWcaaqaaiaadQeadaWgaaWcbaGaci4CaGWaciab=H5arbqabaGccqGHsislcaWGkbWaaSbaaSqaaiaabohacaqGYbGaaeyzaiaabAgaaeqaaaGcbaGaamOsamaaBaaaleaacaqGZbGaaeOCaiaabwgacaqGMbaabeaakmaabmaabaGaeuiMdeLaeyOeI0IaeuiMde1aaSbaaSqaaiaabkhacaqGLbGaaeOzaaqabaaakiaawIcacaGLPaaaaaaaaa@5049@
where JsΘ and Jsref are the saturation magnetizations at temperatures of Θ and Θref respectively