Density of States and Indirect Exchange in Metallic Systems |
| A. Hernandoa,b, J.M. Rojoa, J.C. Gómez Salc and J.M. Barandiaránd aDepartamento de Física de Materiales, Universidad Complutense, Madrid, Spain bInstituto de Magnetismo Aplicado, UCM, CSIC, RENFE, Las Rozas P.O. Box 155, Madrid 28230, Spain cDepartamento de Materia Condensada, Universidad de Cantabria, Santander, Spain dDepartamento de Electricidad y Electrónica, Universidad del Pais Vasco, Bilbao, Spain |
| Received: July 26, 1996 |
| Full Text PDF |
| The relation between the density of states at the Fermi level and the sign of the indirect coupling in metallic systems is revisited in the framework of a simple model recently outlined by the authors. It is shown that high density of states tends to favor ferromagnetic structures. Some examples which support this idea are indicated. Finally we develop a phenomenological explanation for the antiferromagnetic → ferromagnetic transition induced by heating equiatomic FeRh. The transition is analysed in terms of the increase in the density of states produced by the giant volume expansion associated with the ferromagnetic phase. |
| DOI: 10.12693/APhysPolA.90.1227 PACS numbers: 75.25.+z, 75.30.Et, 75.50.Bb |