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Magnetic Properties of YCo5 and SmCo5 – Paul Larson

Date: Mon. February 10th, 2003, 12:30 pm-1:30 pm
Location: Rockefeller 221

SmCo5 is one of the most important hard magnetic materials, having large magnetic moments and large out of plane magnetic anisotropy energy (MAE). We have calculated and analyzed the magnetic properties of the related compounds YCo5 and SmCo5 using first-principles LAPW calculations including LDA+U. We have found that the large MAE arises from both the Co d bands and the localized Sm f-shell, the latter having a large single-site (crystal field) anisotropy. While the magnetic moments found by replacing Co by Cu or Fe in the unit cell follow expectations, the MAE cannot be as easily explained.

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