ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Angle-resolved photoemission is used to determine the energy bands of permalloy (Ni0.8Fe0.2) and compare them to Ni, Co, and Cu. The energy and momentum resolution ((approximate)0.01 eV and (approximate)0.01 Å−1) is high enough to resolve the magnetically split bands at the Fermi level that are responsible for spin-dependent conductivity and tunneling. For the Σ1 band we find the magnetic exchange splittings δEex=0.27 eV (0.23 eV for Ni), δkex=0.16±0.02 Å−1 (0.12±0.01 Å−1 for Ni), the Fermi velocity vF↑=(0.22±0.02)106 m/s (0.28×106 m/s for Ni, 0.33×106 m/s for fcc Co), and the widths δk↑≤0.11 Å−1 and δk↓=0.24 Å−1. Compared to Ni, permalloy features a 27% larger magnetic splitting of the Fermi surface and an extremely short mean free path of 4–8 Å for minority spins. © 1998 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.122796
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