Evidence for ferromagnetic order at gadolinium surfaces above the bulk Curie temperature

C. Rau, S. Eichner
1986 Physical Review B (Condensed Matter)  
The electron-spin polarization P at the topmost layer of atomically clean, magnetized gadolinium (Gd) surfaces is measured by using electron capture spectroscopy. P varies almost linearly with temperature between 160 K (P= -42%) and 315 K (P =0). It is found that the surface Curie temperature T c. is far above-lying near 310 K-the bulk Curie temperature Tc6 = 292.5 K, indicating uniaxial anisotropic magnetic exchange interactions at the topmost surface layer of Gd.
doi:10.1103/physrevb.34.6347 pmid:9940514 fatcat:vnuiexed3jaqrkndd3j2shlpza