Quantum-well and tight-binding analyses of spin-polarized photoemission from Ag/Fe(001) overlayers
Journal Article
·
· Physical Review, B: Condensed Matter; (United States)
- AT T Bell Laboratories, Murray Hill, New Jersey 07974 (United States)
- Physics Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)
Spin-polarized photoemission experiments on expitaxial Ag overlayers on Fe(001) have shown that a minority-spin surface state of the bare substrate evolves into an interface state, moves to higher energies, and crosses the Fermi level [ital E][sub [ital F]] between 3 and 4 Ag monolayers. Application of a phase accumulation model shows that this state is a quantum-well (QW) state characterized by the quantum number [nu]=1, where [nu]=[ital m][minus][ital n], and where [ital n] and [ital m] are the number of wave-function nodes and number of layers, respectively. Higher members of the QW series cross [ital E][sub [ital F]] with a periodicity [Delta][ital m]=(1[minus][ital k][sub [ital F]]/[ital k][sub BZ])[sup [minus]1] identical with that in recent theories for the alternation between ferromagnetic and antiferromagnetic coupling in magnetic multilayers. The QW model fails at low coverages. A tight-binding model captures the behavior at low coverages while reproducing QW behavior at high coverages.
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 5445875
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 49:1; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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