Magnetostrictive Behavior of Fe–Si Single-Crystal Films With Different Orientations Under Rotating Magnetic Fields

Magnetostrictive behaviors of Fe-Si single-crystal hlms are investigated under rotating magnetic helds up to 1.2 kOe. The output waveform of (001) film is triangular, and that of (110) film is bathtub-like, while a (111) film shows very small variation with respect to the angle of the applied magnetic held. The waveforms are different from ideal sinusoidal waveforms. The results indicate that magnetocrystalline anisotropy is playing an important role on the magnetostrictive behavior. The (001) film shows a typical fourfold anisotropy and the (110) film shows uniaxial-like anisotropy. Considering the magnetocrystalline anisotropy, the complex magnetostrictive behavior can be analyzed by employing a 90° domain wall motion model or a coherent rotation model. The small magnetostrictive behavior of (111) film is due to the opposite signs of λ₁₀₀ and λ₁₁₁.