X線回折で眺めた希土類金属の磁歪

概要

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The magnetostriction of the rare earth metals Dy, Ho, and Er have been studied by X-ray diffraction under a magnetic field in the c-plane of the hcp crystal. Continuous and discontinuous changes of the c-lattice parameter accompanying magnetic phase transitions have been observed, and satellite reflections caused by the lattice modulation have been found in the distorted helix and helifan phases. In Er, the 2nd-and 4th-order satellites appeared below 4.5 T at 35K, and the 6th-order satellite has been observed above 4.5 T in addition to the 2nd-and 4th-order satellites. The results for Dy, Ho, and Er can be explained by using the magnetoelastic effect and the magnetic structure calculated by the self-consistent mean field method, except for the result in the high magnetic field region of Er above 4.5 T, where a strongly distorted fan magnetic structure should be assumed to explain the presence of the 6th-order satellite of the lattice modulation.
社団法人日本磁気学会の論文
2000-03-01