Magnetic and conversion electron Mössbauer spectroscopy studies in Fe/Ta multilayers

We have prepared Fe/Ta multilayers by rf sputtering. A small 1-cm2 chip of 57Fe was placed on the Fe target. We studied the magnetization (M) and M-H loops and also carried out conversion electron Mössbauer spectroscopy (CEMS). The in-plane loops are rectangular with a lowest coercivity of 2.6 Oe. M...

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Bibliographic Details
Published in:Journal of applied physics 1993-05, Vol.73 (10), p.6438-6440
Main Authors: SHRINGI, S. N, PIRAMANAYAGAM, S. N, SHIVA PRASAD, VANKATRAMANI, N, PATNI, M. J, KRISHNAN, R, TESSIER, M
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Magnetic properties and materials
Magnetic properties of surface, thin films and multilayers
Metals. Metallurgy
Physics
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Summary:We have prepared Fe/Ta multilayers by rf sputtering. A small 1-cm2 chip of 57Fe was placed on the Fe target. We studied the magnetization (M) and M-H loops and also carried out conversion electron Mössbauer spectroscopy (CEMS). The in-plane loops are rectangular with a lowest coercivity of 2.6 Oe. Magnetization studies indicate a dead Fe layer about 5 Å thick at each interface. CEMS spectra for samples with t(Fe)≥54 Å showed a typical six-line pattern, indicating the presence of bulk Fe. No other Fe sites could be detected. However, for t(Fe)=24 Å, where almost 50% of Fe is nonmagnetic, CEMS spectra showed the presence of a strong paramagnetic doublet.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.352625