Hyperfine Field Distributions of RKKY Spin Glasses Observed by119Sn Mössbauer Spectroscopy

By using Mössbauer spectroscopy in combination with susceptibility measurements it was possible to identify the supertransferred hyperfine field through the oxygen bridges between DyIII and FeIII in a {Fe4Dy2} coordination cluster. The presence of the dysprosium ions provides enough magnetic anisotropy to “block” the hyperfine field that is experienced by the iron nuclei. This has resulted in magnetic spectra with internal hyperfine fields of the iron nuclei of about 23 T. The set of data permitted us to conclude that the direction of the anisotropy in lanthanide nanosize molecular clusters is associated with the single ion and crystal field contributions and 57Fe Mössbauer spectroscopy may be informative with regard to the the anisotropy not only of the studied isotope, but also of elements interacting with this isotope.

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MÖssbauer Measurements of Interfacial Magnetism of MBE Grown FE(100)/AG(100) Multilayers

MRS Proceedings ◽

10.1557/proc-231-405 ◽

1991 ◽

Vol 231 ◽

Author(s):

H. Tang ◽

M.D. Wieczorek ◽

D.J. Keavney ◽

D.F. Storm ◽

C.J. Gutierrez ◽

...

Keyword(s):

Mössbauer Spectroscopy ◽

Hyperfine Field ◽

Temperature Dependence ◽

Layer Thickness ◽

Mossbauer Spectroscopy ◽

Mößbauer Spectroscopy ◽

Mössbauer Measurements ◽

Fe Sites ◽

Probe Layer

AbstractMultilayers of Fe(100)/Ag(100) were grown by MBE and analyzed with in situ RHEED and MÖssbauer spectroscopy. These films had a constant Ag layer thickness of 40 monolayers (ML) and varying Fe layer thicknesses of 3, 6, and 9 ML. Using MÖssbauer spectroscopy the presence of three Fe sites was inferred. From considerations of the hyperflne parameters and the relative intensities of the sextets, we assign one site to the bulk, and one to each interface: Fe on Ag and Ag on Fe. We believe that one explanation of this is differing tetragonal distortions at the two interfaces. Consequently, another series of films was grown in an attempt to distinguish these sites. These films were essentially identical to the 9 ML film above, but the Fe layers were composed of 56Fe, with a 2 ML 57Fe probe layer effused at the bulk and at each interface in turn. At this point 57Fe MÖssbauer spectroscopy was used to determine the hyperfine field and its temperature dependence for each of the three sites.

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Magnetic hyperfine field distribution in pyrrhotites from Mössbauer spectroscopy

Journal of Radioanalytical and Nuclear Chemistry ◽

10.1007/bf02165896 ◽

1991 ◽

Vol 153 (6) ◽

pp. 423-429

Author(s):

E. Reguera Ruiz ◽

V. I. Nikolaev ◽

V. S. Rusakov

Keyword(s):

Mössbauer Spectroscopy ◽

Hyperfine Field ◽

Field Distribution ◽

Mossbauer Spectroscopy ◽

Magnetic Hyperfine Field ◽

Magnetic Hyperfine ◽

Hyperfine Field Distribution ◽

Mößbauer Spectroscopy

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Sn hyperfine field systematics in Rh2MnZ Heusler alloys

Canadian Journal of Physics ◽

10.1139/p84-056 ◽

1984 ◽

Vol 62 (4) ◽

pp. 396-399 ◽

Cited By ~ 10

Author(s):

R. A. Dunlap ◽

S. Jha ◽

G. M. Julian

Keyword(s):

Mössbauer Spectroscopy ◽

Hyperfine Field ◽

Electron Density ◽

Conduction Electron ◽

Mossbauer Spectroscopy ◽

Heusler Alloys ◽

Hyperfine Fields ◽

Mößbauer Spectroscopy ◽

Theoretical Predictions ◽

Conduction Electron Density

Sn hyperfine fields were measured using Mössbauer spectroscopy in the Heusler alloys Rh2MnZ (Z = Ge, Sn). The measurements yielded values of −48 and +31 kOe at 77 K for Sn in Rh2MnGe and Rh2MnSn, respectively. These values showed that in these alloys the Sn hyperfine field decreases with increasing conduction electron density. These results are compared with those obtained for Sn hyperfine fields in X2MnZ and Co2YZ Heusler alloys and are discussed in terms of theoretical predictions.

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