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Hyperfine Interactions - The giant magnetoresistance (GMR) effect was an epoch-making discovery in the field of magnetic materials research. In this article, studies on magnetic multilayered... 相似文献
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Magnetic properties of multilayered Fe/Dy films with artificial superstructures have been investigated by57Fe Mössbauer spectroscopy. Doublet peaks are observed at room temperature when the Fe layer is thinner than 20Å. Mössbauer spectra for thicker Fe layers correspond to α-Fe spectra. In certain samples, i.e. [Fe(44Å)/Dy(6Å)], a gradual spin reorientation takes place, which is evidenced from the change of relative intensities of Δm=0 lines with decreasing temperature. 相似文献
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Fine particles of -FeO(OH) were prepared using the56Fe isotope and the surfaces of the particles were coated with extremely thin57Fe(III) layers. Mössbauer results show that the Fe(III) ions in the top surface layer are involved in the magnetic order and occupy two kinds of surface sites. Both of the two exchange field at surface sites, estimated from the temperature dependences of the hyperfine fields, are smaller than the bulk value. The decrease of exchange fields at the surface sites corresponds to the reduced number of neighboring magnetic ions at each site. 相似文献
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S. Nasu T. Shibatani Y. Maeda M. Seto H. Dohnomae N. Mima T. Shinjo 《Hyperfine Interactions》1992,71(1-4):1359-1362
197Au Mössbauer measurements have been performed at 16 K on the Au/Ni artificial multilayers having three different thickness of the layers those are 10Å Au/10Å Ni, 30Å Au/30Å Ni and 53Å Au/53Å Ni on a 250Å pure Au buffer layer. Mössbauer spectra obtained can be decomposed into mainly two components. One is an unperturbed component having an identical isomer shift value to the bulk Au metal. The other is the component perturbed strongly by the Ni layer indicating a broad contribution at positive velocity side and its intensity depends on the thickness of the Au layer. The spectrum from 10Å Au/10Å Ni multilayer is an entirely perturbed one and its area ratio to the component rising from pure Au buffer layer indicates the large Debye-Waller-factor suggesting the supermodulus effect in this multilayer. 相似文献
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S. Nasu M. Yoshida Y. Oda T. Kohara T. Shinjo K. Asayama F. E. Fujita S. Katsuyama Y. Ueda K. Kosuge 《Hyperfine Interactions》1991,66(1-4):417-421
The57Co emission Mössbauer spectra from YBa2Cu3O6.92 (1-2-307) and YBa2Cu3O6.00 (1-2-306) have been measured and compared with the57Fe absorption spectra from YBa2Cu2.95Fe0.05O7?δ in order to clarify decisively the site assignments for the57Fe quadrupole-split doublets in these compounds. Mössbauer spectra obtained from both specimens consist of four components whose hyperfine interaction parameters well agree with each other. It is shown that the Co and Fe atoms mainly substitute at Cu1 chain sites in 1-2-307, but in 1-2-306 the Co atoms occupy randomly the Cu2 plane sites and indicate magnetically-split sextet which converts to a paramagnetic doublet of S-state Fe3+ in 1-2-307 by a post-annealing in O2 gas. 相似文献
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T. Shinjo H. Yamamoto T. Okuyama S. Araki K. Mibu N. Hosoito 《Hyperfine Interactions》1992,68(1-4):333-336
Mössbauer spectroscopy has been applied to study the interface magnetic propertics of multilayers exhibiting large magnetoresistance (MR) effects; Fe/Cr and Cu/Co/Cu/Fe. The temperature dependence of the local magnetization for the interface atom layers is found to be much smaller than that of the MR effect. 相似文献
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S. Nasu H. Kitagawa T. Kohara K. Oda T. Shinjo K. Asayama F. E. Fujita 《Hyperfine Interactions》1988,42(1-4):1255
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M. Mekata H. Yamana S. Okamoto K. Yoshimura N. Hosoito T. Shinjo 《Hyperfine Interactions》1988,41(1):495-498
The Mössbauer spectra of 3%57Fe doped CsCoCl3 revealed marked relaxation in all phases. The relaxation was interpreted in terms of propagating domain walls along the magnetic chains together with the transition between the lowest doublet and the low excited singlet levels. The hyperfine field of 24.5T was observed at 4.5K. 相似文献