Mossbauer Study of Magnetic Properties and Structure of Amorphous Fe-(Co,Cr)-Zr Alloys

概要

論文の詳細を見る
Mossbauer spectroscopy was used to study the effects of composition, temperature, hydorogenation, external magnetic field on series of amorphous Fe_<90-x>Co_xZr_<10> (x = 4,10,..., 70) and Fe_<90-y>Cr_yZr_<10> (y = 0,4,7,13,16,20) alloys. Magnetic anisotropy and moment distributions in terms of an expansion in spherical harmonies were analyzed. The results reveal the following facts: (i) The hyperfine field distributions P(H_<hf>) H_<hf> of a-Fe_<90-x>Co_xZr_<10> (x = 4,10,20) and Fe_<90-y>. Cr_yZr_<10>(y = 0,4,7,13,16) comprise two or three Gaussian distributions, the low-field and high-field spin fractions obtained from the fitting of P(H_<hf>)-H_<hf> curve are changed by Co(Cr) content, temperature, applied magnetic field and hydrogenation. (ii) Anomalous behaviors are found in Co(Cr)-poor Fe-(Co,Cr)-Zr alloys, which means the existence of Invar effect and spin-grass-like behavior. (iii) Hydrogenation gives rise to the drastic changes of the hyperfine parameters, which can mainly be associated with the volume and hybridization effect. (iv) The moment distributions of a-Fe_<90-x>Co_xZr_<10> (x = 4,10,20,30,40) are preferentially in the direction of the film length. A 90°-type magnetic coupling between spin-clusters in 3DFM and in FSC may exist in Co(Cr)-poor Fe-(Co,Cr)-Zr alloys. A "3DFM+FS+FSC" model containing density inhomogeneity provides a rather satisfactory explanation.
社団法人応用物理学会の論文
1998-01-15