Ferromagnetic Resonance in Single-Crystal Thin Films of Iron

Abstract

Oriented (001) iron films deposited on MgO were examined by ferromagnetic resonance at 9.2, 18.4, and 25.0 kMc. A variation of resonance field at 18.4 and 25.0 kMc with an angle θ between the external magnetic field and the [100] direction in the film plane is nearly cos4θ. The crystalline anisotropy constant K1 and the g factor of iron at 300°K are obtained as (4.90±0.10) × 105 ergs/cm3 and 2.01±0.02, respectively. At the lower frequency two resonance peaks are observed only near the 〈110〉 directions. This anomalous effect is explained by a simple single-domain analysis.