Hyperfine magnetic fields in cobalt-based Heusler alloys
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.
- Research Organization:
- Cincinnati Univ., OH (USA)
- OSTI ID:
- 7032769
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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