Magnetostriction in Ferromagnetic CdCr2Se4

Abstract

The magnetostriction constants λ₁₀₀ and λ₁₁₁ of CdCr₂Se₄ have been measured using a ferromagnetic resonance technique. At 4.2°K the results are: λ₁₀₀ = +2.6×10⁻⁶ and λ₁₁₁ = −28×10⁻⁶. The dominant λ₁₁₁ is of single‐ion origin, and its magnetization dependence is described very well by the single‐ion theory of Callen and Callen. A ferromagnetic resonance linewidth of 15 Oe and anisotropy constant K₁ of 3.5×10³ erg/cc have been determined at 4.2°K. The Curie temperature, determined by an initial permeability method, was 129°±2°K.