Effective Heisenberg Hamiltonian for itinerant ferromagnets
- 1 February 1983
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 27 (3) , 1916-1918
- https://doi.org/10.1103/physrevb.27.1916
Abstract
A simple derivation of an effective Heisenberg Hamiltonian for itinerant ferromagnets is given and it is pointed out that the effective exchange integral for a strong ferromagnet such as nickel decays exponentially with distance , as in magnetic insulators. The standard Ruderman-Kittel-Kasuya-Yosida form of , typical of metals, is obtained only for weak ferromagnets such as iron.
Keywords
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