Modification of magnetic anisotropy in metallic glasses using high-energy ion beam irradiation

Pramana

K V Amrute¹  D C Kothari1¹  S K Sinha¹  R Nagarajan³  D Kanjilal²  U R Mhatre¹ 

[1] Department of Physics, University of Mumbai, Vidyanagari, Mumbai 400 098, India$$;Nuclear Science Centre, Aruna Asaf Ali Marg, New Delhi 110 067, India$$;Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India$$

关键词: Magnetic anisotropy;    metallic glasses;    heavy ion irradiation;    Mossbauer spectroscopy.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

Heavy ion irradiation in the electronic stopping power region induces macroscopic dimensional change in metallic glasses and introduces magnetic anisotropy in some magnetic materials. The present work is on the irradiation study of ferromagnetic metallic glasses, where both dimensional change and modification of magnetic anisotropy are expected. Magnetic anisotropy was measured using Mössbauer spectroscopy of virgin and irradiated Fe40Ni40B20 and Fe40Ni38Mo4B18 metallic glass ribbons. 90 MeV 127I beam was used for the irradiations. Irradiation doses were 5 × 1013 and 7.5 × 1013 ions/cm2. The relative intensity ratios 𝐷23 of the second and third lines of the Mössbauer spectra were measured to determine the magnetic anisotropy. The virgin samples of both the materials display in-plane magnetic anisotropy, i.e., the spins are oriented parallel to the ribbon plane. Irradiation is found to cause reduction in magnetic anisotropy. Near-complete randomization of magnetic moments is observed at high irradiation doses. Correlation is found between the residual stresses introduced by ion irradiation and the change in magnetic anisotropy.

【 授权许可】

Unknown