1999
DOI: 10.1063/1.370084
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Mössbauer study of the influence of thermal treatment on giant magnetoresistance and interface structure in Fe/Cr multilayers

Abstract: The dependence of the giant magnetoresistance effect (GMR) on the interface structure in Fe/Cr multilayers was studied by magnetoresistivity and Mössbauer spectroscopy. The Fe/Cr multilayers consisting of Fe(6 nm)+[Cr(1.1 nm)/Fe(3 nm)]60+Cr(1.1 nm) were deposited by dc magnetron sputtering. Samples were annealed for 1 h at temperatures ranging from 200 to 500 °C. The interface structure was characterized by conversion electron Mössbauer spectroscopy (CEMS). Various different Fe sites: the bulk, step and perfec… Show more

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Cited by 31 publications
(20 citation statements)
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“…Finally, after 500 C annealing, the spectrum resembles the one of a FeCr alloy [11] whereas the Kerr loop becomes rectangular and the sample is fully saturated in the remanence state. Such behavior can be explained, similarly as it was done by Kopcewicz et al [10] for polycrystalline Fe/Cr superlattices, by assuming an enhanced interfacial diffusion, which occurs at a relatively low temperature and leads to interface smoothening. Obviously, such process does not influence the interlayer exchange coupling but may lead to an enhancement of the GMR effect, as reported previously [10].…”
mentioning
confidence: 88%
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“…Finally, after 500 C annealing, the spectrum resembles the one of a FeCr alloy [11] whereas the Kerr loop becomes rectangular and the sample is fully saturated in the remanence state. Such behavior can be explained, similarly as it was done by Kopcewicz et al [10] for polycrystalline Fe/Cr superlattices, by assuming an enhanced interfacial diffusion, which occurs at a relatively low temperature and leads to interface smoothening. Obviously, such process does not influence the interlayer exchange coupling but may lead to an enhancement of the GMR effect, as reported previously [10].…”
mentioning
confidence: 88%
“…Such behavior can be explained, similarly as it was done by Kopcewicz et al [10] for polycrystalline Fe/Cr superlattices, by assuming an enhanced interfacial diffusion, which occurs at a relatively low temperature and leads to interface smoothening. Obviously, such process does not influence the interlayer exchange coupling but may lead to an enhancement of the GMR effect, as reported previously [10]. At higher annealing temperatures, a mass transport vertical to the interfaces occurs, which causes that the Fe/Cr interfaces become blurred and the ferromagnetic order appears in the intermixed Fe/Cr/Fe alloy-like layers.…”
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confidence: 88%
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“…The hyperfine fields of the two kinds of PACI composites are both 33.0 T, which is the same as the bulk of ␣-iron. In Mössbauer experiments, the average angle (ˇ) between the incident ␥-ray and the magnetization direction can be expressed by the relative intensity ratio [23]:…”
Section: Resultsmentioning
confidence: 99%
“…In Mössbauer experiments, the average angle θ between the incident γ-rays and the magnetization direction can be assessed by the relative intensity ratio [39,40] θ θ + , where I 2,5 and I 1,6 are the relative intensity ratios of the 2,5 and 1,6 peaks in magnetic splitting sextet, respectively. When the magnetic moments of the resonance atom 57 Fe, which can be detected, are arrayed perpendicularly to the incident direction of γ-ray, the ratio between the 2,5 and 1,6 peaks is 4/3.…”
Section: Condensed Matter Physicsmentioning
confidence: 99%