Photoemission Studies of Pseudomorphic Films of FexNi1-x Magnetic Alloys Exhibiting The 'Invar' Effect
Abstract
We report angle- and spin-resolved photoemission of the magnetic behavior of FexNi1-x alloys, prepared in the form of ultrathin pseudomorphic epitaxial films on Cu(100). Subtle changes are observed occurring with changes in alloy stoichiometry in states at the Fremi energy in a (110) plane cut through the Fermi surface. With increasing Fe concentration, the number of hole states increase due to the emergence of spin minority d-states wihch hybridize with sp-states at specific location in k-space. With increasing spin polarization, the everage magnetic moment increases together with the exchange splitting of the valence states. At a critical concentration ~65% Fe, the magnetic moment decreases dramatically together with a collapse in the exchange energy. Increased diffuseness of the electronic states is indicative of magnetic disorder. * Measurements conducted at the Advanced Light Source, Beamline 7, Berkeley.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2000
- Bibcode:
- 2000APS..MARG26007H