Co-(Pr, Nd)人工格子膜の磁気及び磁気光学特性

抄録

Artificial superlattice of Co-(Pr, Nd) was fabricated on glass substrates using the electron beam evaporation technique. Magnetic properties such as (i) the dependence of saturation magnetization, M_s, on temperature, (ii) the dependence of perpendicular magnetic anisotropy constant, K_⊥, on temperature and (iii) the dependence of polar Kerr rotation angle, θ_k, on wavelength were systematically investigated. For Co/Pr, Co/Nd artificial superlattice, rare earth atoms within 25Å of the interface were found to be coupled ferromagnetically with Co atoms at 77K. K_⊥ increases with decreasing artificial period, D, for both Co/Pr and Co/Nd artificial superlattice. The maximum values of K_⊥ at 77K are 10×10⁶ erg/cm³ and 4×10⁶ erg/cm³ for Co/Pr and Co/Nd artificial superlattice, respectively. The wavelength where the minimum θ_k is observed shifts from 0.45μm to 0.65μm with decreasing artificial period.