The atomic structure and net magnetic moments in nanosized Fe clusters embedded in Cu were determined as a function of cluster filling fraction by extended x-ray-absorption fine structure (EXAFS) and magnetometry measurements, respectively. Below the percolation threshold (~25%), the Fe clusters have an fcc structure with a lattice parameter of 3.58±0.02 and are ferromagnetic with a net atomic magnetic moment of 0.4--0.9 μB. Spin polarized electronic structure calculations were also performed on Fe core/Cu shell systems to investigate the magnetic behavior as a function of lattice spacing; the calculated moments correlate well with experiment.
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Baker et al. (2008) studied this question.
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