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Title: Hyperfine magnetic fields in cobalt-based Heusler alloys

Abstract

Measurement of hyperfine interactions at Cd-111 and Sn-119 impurity nuclei in Co-based Heusler alloys Co/sub 2/YZ (Y = Mn, Ti, V, Zr and Z was Al, Ga, Ge, Si, Sn) were made within a temperature range 77 to 746 K using the time differential Perturbed Angular Correlation (TDPAC) and Mossbauer techniques. The hyperfine-field results in these alloys are discussed in terms of two models, the localized moment model and the Volume Overlap model. In the localized moment model a pre-asymptotic phase factor n = ..pi.. at distance r = a/2 was used to fit the experimental results on Co/sub 2/YZ (Y = Ti, V, Zr and Z = Al, Ga, Sn, Ge). In the Volume Overlap model the hyperfine field results in the series Co/sub 2/MnZ (Z = Ge, Si, Sn) was plotted against the lattice parameter of these alloys; a linear relationship was found, suggesting a non overlap term between the magnetic atom and the nonmagnetic impurity. A prediction of hyperfine magnetic filed less than 40 (kOe) on Sn-119 and of about -250(kOe) on Cd-111 in Co/sub 2/TiSi and Co/sub 2/TiGe is made. Temperature variation of the hyperfine magnetic field in the alloy Co/sub 2/MnSn with magnetic moments residingmore » on two sites, has been studied. Results didn't show a dramatic deviation form the Brillouin function.« less

Authors:
Publication Date:
Research Org.:
Cincinnati Univ., OH (USA)
OSTI Identifier:
7032769
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: Thesis (Ph. D.)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COBALT BASE ALLOYS; HYPERFINE STRUCTURE; MAGNETIC FIELDS; HEUSLER ALLOYS; BRILLOUIN EFFECT; CADMIUM 111; HIGH TEMPERATURE; IMPURITIES; LOW TEMPERATURE; MEDIUM TEMPERATURE; MOESSBAUER EFFECT; PERTURBED ANGULAR CORRELATION; TIN 119; ALLOYS; ALUMINIUM ALLOYS; ANGULAR CORRELATION; CADMIUM ISOTOPES; COBALT ALLOYS; COHERENT SCATTERING; COPPER ALLOYS; COPPER BASE ALLOYS; CORRELATIONS; DAYS LIVING RADIOISOTOPES; EVEN-ODD NUCLEI; INTERMEDIATE MASS NUCLEI; INTERNAL CONVERSION RADIOISOTOPES; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; MANGANESE ALLOYS; MINUTES LIVING RADIOISOTOPES; NUCLEI; RADIOISOTOPES; SCATTERING; STABLE ISOTOPES; TIN ISOTOPES; 360104* - Metals & Alloys- Physical Properties

Citation Formats

Yehia, M S. Hyperfine magnetic fields in cobalt-based Heusler alloys. United States: N. p., 1987. Web.
Yehia, M S. Hyperfine magnetic fields in cobalt-based Heusler alloys. United States.
Yehia, M S. 1987. "Hyperfine magnetic fields in cobalt-based Heusler alloys". United States.
@article{osti_7032769,
title = {Hyperfine magnetic fields in cobalt-based Heusler alloys},
author = {Yehia, M S},
abstractNote = {Measurement of hyperfine interactions at Cd-111 and Sn-119 impurity nuclei in Co-based Heusler alloys Co/sub 2/YZ (Y = Mn, Ti, V, Zr and Z was Al, Ga, Ge, Si, Sn) were made within a temperature range 77 to 746 K using the time differential Perturbed Angular Correlation (TDPAC) and Mossbauer techniques. The hyperfine-field results in these alloys are discussed in terms of two models, the localized moment model and the Volume Overlap model. In the localized moment model a pre-asymptotic phase factor n = ..pi.. at distance r = a/2 was used to fit the experimental results on Co/sub 2/YZ (Y = Ti, V, Zr and Z = Al, Ga, Sn, Ge). In the Volume Overlap model the hyperfine field results in the series Co/sub 2/MnZ (Z = Ge, Si, Sn) was plotted against the lattice parameter of these alloys; a linear relationship was found, suggesting a non overlap term between the magnetic atom and the nonmagnetic impurity. A prediction of hyperfine magnetic filed less than 40 (kOe) on Sn-119 and of about -250(kOe) on Cd-111 in Co/sub 2/TiSi and Co/sub 2/TiGe is made. Temperature variation of the hyperfine magnetic field in the alloy Co/sub 2/MnSn with magnetic moments residing on two sites, has been studied. Results didn't show a dramatic deviation form the Brillouin function.},
doi = {},
url = {https://www.osti.gov/biblio/7032769}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 1987},
month = {Thu Jan 01 00:00:00 EST 1987}
}

Thesis/Dissertation:
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