Magnetic Hyperfine Field

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R. N. Saxena - One of the best experts on this subject based on the ideXlab platform.

  • Anomalous behavior of the Magnetic Hyperfine Field at 140Ce impurities at La sites in LaMnSi2
    AIP Advances, 2018
    Co-Authors: C. Domienikan, B. Bosch-santos, R. N. Saxena, G. A. Cabrera-pasca, Artur W. Carbonari
    Abstract:

    Magnetic Hyperfine Field has been measured in the orthorhombic intermetallic compound LaMnSi2 with perturbed angular correlation (PAC) spectroscopy using radioactive 140La(140Ce) nuclear probes. Magnetization measurements were also carried out in this compound with MPSM-SQUID magnetometer. Samples of LaMnSi2 compound were prepared by arc melting the component metals with high purity under argon atmosphere followed by annealing at 1000°C for 60 h under helium atmosphere and quenching in water. X-ray analysis confirmed the samples to be in a single phase with correct crystal structure expected for LaMnSi2 compound. The radioactive 140La (T1/2 = 40 h) nuclei were produced by direct irradiation of the sample with neutrons in the IEA-R1 nuclear research reactor at IPEN with a flux of ∼ 1013 n cm−2s−1 for about 3 - 4 min. The PAC measurements were carried out with a six BaF2 detector spectrometer at several temperatures between 10 K and 400 K. Temperature dependence of the Hyperfine Field, Bhf was found to be anomalous. A modified two-state model explained this anomalous behavior where the effective Magnetic Hyperfine Field at 140Ce is believed to have two contributions, one from the unstable localized spins at Ce impurities and another from the Magnetic Mn atoms of the host. The competition of these two contributions explains the anomalous behavior observed for the temperature dependence of the Magnetic Hyperfine Field at 140Ce. The ferroMagnetic transition temperature (TC) of LaMnSi2 was determined to be 400(1) K confirming the Magnetic measurements.Magnetic Hyperfine Field has been measured in the orthorhombic intermetallic compound LaMnSi2 with perturbed angular correlation (PAC) spectroscopy using radioactive 140La(140Ce) nuclear probes. Magnetization measurements were also carried out in this compound with MPSM-SQUID magnetometer. Samples of LaMnSi2 compound were prepared by arc melting the component metals with high purity under argon atmosphere followed by annealing at 1000°C for 60 h under helium atmosphere and quenching in water. X-ray analysis confirmed the samples to be in a single phase with correct crystal structure expected for LaMnSi2 compound. The radioactive 140La (T1/2 = 40 h) nuclei were produced by direct irradiation of the sample with neutrons in the IEA-R1 nuclear research reactor at IPEN with a flux of ∼ 1013 n cm−2s−1 for about 3 - 4 min. The PAC measurements were carried out with a six BaF2 detector spectrometer at several temperatures between 10 K and 400 K. Temperature dependence of the Hyperfine Field, Bhf was found to be a...

  • Magnetic behavior of lamn2 si 1 x gex 2 compounds characterized by Magnetic Hyperfine Field measurements
    Journal of Applied Physics, 2014
    Co-Authors: B Boschsantos, A W Carbonari, G A Cabrerapasca, R. N. Saxena
    Abstract:

    The temperature dependence of the Magnetic Hyperfine Field (Bhf) at Mn atom sites was measured in LaMn2(Si(1−x)Gex)2, with 0 ≤ x ≤ 1, compounds with perturbed γ−γ angular correlation spectroscopy using 111In(111Cd) as probe nuclei in the temperature range from 20 K to 480 K. The results show a transition from antiferroMagnetic to ferroMagnetic ordering for all studied compounds when Ge gradually replaces Si and allowed an accurate determination of the Neel temperature (TN) for each compound. It was observed that TN decreases when Ge concentration increases. Conversely, the Curie temperature increases with increase of Ge concentration. This remarkable change in the behavior of the transition temperatures is discussed in terms of the Mn-Mn distance and ascribed to a change in the exchange constant Jex.

  • Magnetic Hyperfine Field in antiferroMagnetic rga2 r ce pr nd sm gd tb dy ho er studied by perturbed angular correlation spectroscopy using cd111
    Journal of Applied Physics, 2013
    Co-Authors: F. H. M. Cavalcante, R. N. Saxena, H. Saitovitch, A W Carbonari, L F D Pereira, J T Cavalcante, M. Forker
    Abstract:

    The Magnetic and electric Hyperfine interactions of the nuclear probe Cd111 in the hexagonal antiferroMagnetic rare earth-gallium RGa2 (R = Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, and Er) intermetallic compounds have been investigated by perturbed angular correlation (PAC) spectroscopy as a function of temperature. With the exception of R = Nd and Ho, the Magnetic Hyperfine Field Bhf is roughly proportional to the spin projection (g − 1)J of the R constituent. However, in the group of the light rare earths, the variation of Bhf with (g − 1)J is much weaker than that for the heavy R constituents, in contrast to the trend reported for all rare earth intermetallics investigated up to now as well as to the trend of the Magnetic ordering temperatures of RGa2. The orientation of the 4f spins relative to the c axis of RGa2 deduced from the angle between Bhf and the symmetry axis of the electric Field gradient was found to be temperature independent and in agreement with the results of previous magnetization measurements...

  • investigation of the Magnetic Hyperfine Field at r and zn sites in rzn r gd tb dy compounds using perturbed gamma gamma angular correlation spectroscopy with 140ce and 111cd as probe nuclei
    Journal of Applied Physics, 2013
    Co-Authors: B Boschsantos, A W Carbonari, G A Cabrerapasca, M S Costa, R. N. Saxena
    Abstract:

    The Magnetic Hyperfine Field (Bhf) in RZn compounds (R = Gd, Tb, Dy) has been investigated by perturbed angular correlation spectroscopy using 140Ce and 111Cd as probe nuclei, respectively, at R and Zn sites, in order to study the origin of the Magnetic coupling in these compounds. The results for 111Cd probe showed that the temperature dependence of Bhf roughly follows the Brillouin function for the R total angular momentum J of each compound. The temperature dependence of Bhf measured with 140Ce probes showed, however, a sharp deviation from the Brillouin curve for all compounds, which was ascribed to the contribution of the 4f-electron of Ce3+ to Bhf.

  • effect of ge substitution for si on the Magnetic Hyperfine Field in lamn2si2 compound measured by perturbed angular correlation spectroscopy with 140ce as probe nuclei
    Journal of Applied Physics, 2013
    Co-Authors: B Boschsantos, A W Carbonari, G A Cabrerapasca, M S Costa, R. N. Saxena
    Abstract:

    The effect of substitution of Ge for Si in LaMn2Si2 compound on the Magnetic Hyperfine Field (Bhf) has been investigated by perturbed γ−γ angular correlation (PAC) spectroscopy using 140La(140Ce) as probe nuclei. This compound exhibits antiferromagnetism followed by a ferroMagnetic ordering when temperature decreases. The behavior of the ferroMagnetic transition when Ge gradually replaces Si, with concentrations of 20%, 40%, 80%, and 100% is discussed. PAC measurements were carried out in the temperature range from 15 K to 325 K. Results for LaMn2Si2 compound showed that the dependence of Bhf with temperature follows the expected behavior for the host magnetization and could be fitted by a Brillouin function for JMn = 5/2. However, the temperature dependence of Bhf for compounds when Si is gradually replaced by Ge showed a deviation from such a behavior, which gradually increases up to a strong deviation observed for LaMn2Ge2. This striking behavior was ascribed to the hybridization of d band of the host and f band of the Ce impurities, which is stronger when the unit cell volume increase as Si ions are substituted by Ge atoms.The effect of substitution of Ge for Si in LaMn2Si2 compound on the Magnetic Hyperfine Field (Bhf) has been investigated by perturbed γ−γ angular correlation (PAC) spectroscopy using 140La(140Ce) as probe nuclei. This compound exhibits antiferromagnetism followed by a ferroMagnetic ordering when temperature decreases. The behavior of the ferroMagnetic transition when Ge gradually replaces Si, with concentrations of 20%, 40%, 80%, and 100% is discussed. PAC measurements were carried out in the temperature range from 15 K to 325 K. Results for LaMn2Si2 compound showed that the dependence of Bhf with temperature follows the expected behavior for the host magnetization and could be fitted by a Brillouin function for JMn = 5/2. However, the temperature dependence of Bhf for compounds when Si is gradually replaced by Ge showed a deviation from such a behavior, which gradually increases up to a strong deviation observed for LaMn2Ge2. This striking behavior was ascribed to the hybridization of d band of the host ...

M. Forker - One of the best experts on this subject based on the ideXlab platform.

A W Carbonari - One of the best experts on this subject based on the ideXlab platform.

  • Magnetic behavior of lamn2 si 1 x gex 2 compounds characterized by Magnetic Hyperfine Field measurements
    Journal of Applied Physics, 2014
    Co-Authors: B Boschsantos, A W Carbonari, G A Cabrerapasca, R. N. Saxena
    Abstract:

    The temperature dependence of the Magnetic Hyperfine Field (Bhf) at Mn atom sites was measured in LaMn2(Si(1−x)Gex)2, with 0 ≤ x ≤ 1, compounds with perturbed γ−γ angular correlation spectroscopy using 111In(111Cd) as probe nuclei in the temperature range from 20 K to 480 K. The results show a transition from antiferroMagnetic to ferroMagnetic ordering for all studied compounds when Ge gradually replaces Si and allowed an accurate determination of the Neel temperature (TN) for each compound. It was observed that TN decreases when Ge concentration increases. Conversely, the Curie temperature increases with increase of Ge concentration. This remarkable change in the behavior of the transition temperatures is discussed in terms of the Mn-Mn distance and ascribed to a change in the exchange constant Jex.

  • Magnetic Hyperfine Field in antiferroMagnetic rga2 r ce pr nd sm gd tb dy ho er studied by perturbed angular correlation spectroscopy using cd111
    Journal of Applied Physics, 2013
    Co-Authors: F. H. M. Cavalcante, R. N. Saxena, H. Saitovitch, A W Carbonari, L F D Pereira, J T Cavalcante, M. Forker
    Abstract:

    The Magnetic and electric Hyperfine interactions of the nuclear probe Cd111 in the hexagonal antiferroMagnetic rare earth-gallium RGa2 (R = Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, and Er) intermetallic compounds have been investigated by perturbed angular correlation (PAC) spectroscopy as a function of temperature. With the exception of R = Nd and Ho, the Magnetic Hyperfine Field Bhf is roughly proportional to the spin projection (g − 1)J of the R constituent. However, in the group of the light rare earths, the variation of Bhf with (g − 1)J is much weaker than that for the heavy R constituents, in contrast to the trend reported for all rare earth intermetallics investigated up to now as well as to the trend of the Magnetic ordering temperatures of RGa2. The orientation of the 4f spins relative to the c axis of RGa2 deduced from the angle between Bhf and the symmetry axis of the electric Field gradient was found to be temperature independent and in agreement with the results of previous magnetization measurements...

  • investigation of the Magnetic Hyperfine Field at r and zn sites in rzn r gd tb dy compounds using perturbed gamma gamma angular correlation spectroscopy with 140ce and 111cd as probe nuclei
    Journal of Applied Physics, 2013
    Co-Authors: B Boschsantos, A W Carbonari, G A Cabrerapasca, M S Costa, R. N. Saxena
    Abstract:

    The Magnetic Hyperfine Field (Bhf) in RZn compounds (R = Gd, Tb, Dy) has been investigated by perturbed angular correlation spectroscopy using 140Ce and 111Cd as probe nuclei, respectively, at R and Zn sites, in order to study the origin of the Magnetic coupling in these compounds. The results for 111Cd probe showed that the temperature dependence of Bhf roughly follows the Brillouin function for the R total angular momentum J of each compound. The temperature dependence of Bhf measured with 140Ce probes showed, however, a sharp deviation from the Brillouin curve for all compounds, which was ascribed to the contribution of the 4f-electron of Ce3+ to Bhf.

  • effect of ge substitution for si on the Magnetic Hyperfine Field in lamn2si2 compound measured by perturbed angular correlation spectroscopy with 140ce as probe nuclei
    Journal of Applied Physics, 2013
    Co-Authors: B Boschsantos, A W Carbonari, G A Cabrerapasca, M S Costa, R. N. Saxena
    Abstract:

    The effect of substitution of Ge for Si in LaMn2Si2 compound on the Magnetic Hyperfine Field (Bhf) has been investigated by perturbed γ−γ angular correlation (PAC) spectroscopy using 140La(140Ce) as probe nuclei. This compound exhibits antiferromagnetism followed by a ferroMagnetic ordering when temperature decreases. The behavior of the ferroMagnetic transition when Ge gradually replaces Si, with concentrations of 20%, 40%, 80%, and 100% is discussed. PAC measurements were carried out in the temperature range from 15 K to 325 K. Results for LaMn2Si2 compound showed that the dependence of Bhf with temperature follows the expected behavior for the host magnetization and could be fitted by a Brillouin function for JMn = 5/2. However, the temperature dependence of Bhf for compounds when Si is gradually replaced by Ge showed a deviation from such a behavior, which gradually increases up to a strong deviation observed for LaMn2Ge2. This striking behavior was ascribed to the hybridization of d band of the host and f band of the Ce impurities, which is stronger when the unit cell volume increase as Si ions are substituted by Ge atoms.The effect of substitution of Ge for Si in LaMn2Si2 compound on the Magnetic Hyperfine Field (Bhf) has been investigated by perturbed γ−γ angular correlation (PAC) spectroscopy using 140La(140Ce) as probe nuclei. This compound exhibits antiferromagnetism followed by a ferroMagnetic ordering when temperature decreases. The behavior of the ferroMagnetic transition when Ge gradually replaces Si, with concentrations of 20%, 40%, 80%, and 100% is discussed. PAC measurements were carried out in the temperature range from 15 K to 325 K. Results for LaMn2Si2 compound showed that the dependence of Bhf with temperature follows the expected behavior for the host magnetization and could be fitted by a Brillouin function for JMn = 5/2. However, the temperature dependence of Bhf for compounds when Si is gradually replaced by Ge showed a deviation from such a behavior, which gradually increases up to a strong deviation observed for LaMn2Ge2. This striking behavior was ascribed to the hybridization of d band of the host ...

  • Magnetic Hyperfine Field at highly diluted ce impurities in the antiferroMagnetic compound gdrh2si2 studied by perturbed gamma gamma angular correlation spectroscopy
    Journal of Alloys and Compounds, 2012
    Co-Authors: G A Cabrerapasca, R. N. Saxena, A W Carbonari, B Boschsantos, J A H Coaquira, J A Filho
    Abstract:

    Abstract The Magnetic properties of GdRh2Si2 compound were investigated by Hyperfine interactions and magnetization measurements. The temperature dependence of the Magnetic Hyperfine Field (mhf) at highly diluted 140La–140Ce probe nuclei in the GdRh2Si2 compound was measured using perturbed gamma–gamma angular correlation spectroscopy. A well-defined Magnetic interaction is observed at 140Ce substituting Gd atoms in the compound below the Neel temperature (TN). However, the temperature dependence of mhf shows a deviation from the expected Brillouin-like behavior and a sharp increase of mhf values is observed for temperatures below approximately half of TN. This behavior has been associated with an additional Magnetic interaction which is ascribed to the polarization of Ce spin moment induced by the Magnetic Field coming from Gd ions. A model based on the molecular-Field theory is used to fit the temperature dependence of the mhf. The mhf contributions from the probe atom itself and from the Magnetic Gd ions of the host matrix are determined. The results are compared to previous measurements of mhf at 140Ce in Gd and GdAg compound. The contribution from the host to the mhf is discussed in terms of the f–s and f–d interactions.

P. De La Presa - One of the best experts on this subject based on the ideXlab platform.

  • Spin and temperature dependence of the Magnetic Hyperfine Field of 111Cd in the rare earth-aluminum Lavesphase compounds RAl2
    Journal of Magnetism and Magnetic Materials, 2006
    Co-Authors: P. De La Presa, M. Forker, J.th. Cavalcante, Alejandro Ayala
    Abstract:

    Abstract Perturbed angular correlation spectroscopy has been used to investigate the combined Magnetic and electric Hyperfine interaction of the probe nucleus 111 Cd in ferroMagnetically ordered rare earth (R)-dialuminides RAl 2 as a function of temperature for the rare earth constituents R=Pr, Nd, Sm, Eu, Tb, Dy, Ho and Er. In compounds with two Magnetically non-equivalent Al sites (R=Sm, Tb, Ho, Er), the Magnetic Hyperfine Field was found to be strongly anisotropic. This anisotropy is much greater than the anisotropic dipolar Fields, suggesting a contribution of the anisotropic 4f-electron density to Magnetic Hyperfine Field at the closed-shell probe nucleus. The spin dependence of the Magnetic Hyperfine Field reflects a decrease of the effective exchange parameter of the indirect coupling with increasing R atomic number. For the compounds with the R constituents R=Pr, Nd, Tb, Dy and Ho the parameters B 4 , B 6 of the interaction of the crystal Field interaction have been determined from the temperature dependence of the Magnetic Hyperfine Field. The 111 Cd PAC spectrum of EuAl 2 at 9 K confirms the antiferroMagnetic structure of this compound.

  • The Magnetic Hyperfine Field of 111Cd in the Rare Earth–Nickel Laves Phases RNi2
    Hyperfine Interactions, 2004
    Co-Authors: Stefan Müller, P. De La Presa, M. Forker
    Abstract:

    The Magnetic Hyperfine Field of 111Cd in the C15 Laves phases RNi2 has been investigated by perturbed angular correlation (PAC) spectroscopy as a function of temperature for the rare earth constituents R = Nd, Sm, Gd, Tb, Dy, Ho, Er, and Tm.

  • the Magnetic Hyperfine Field of 111cd in the rare earth nickel laves phases rni2
    Hyperfine Interactions, 2004
    Co-Authors: Stefan Müller, P. De La Presa, M. Forker
    Abstract:

    The Magnetic Hyperfine Field of 111Cd in the C15 Laves phases RNi2 has been investigated by perturbed angular correlation (PAC) spectroscopy as a function of temperature for the rare earth constituents R = Nd, Sm, Gd, Tb, Dy, Ho, Er, and Tm.

  • Orientation of the Magnetic Hyperfine Field at 111Cd in HCP Gd metal studied by perturbed angular correlations
    Journal of Magnetism and Magnetic Materials, 2004
    Co-Authors: P. De La Presa, M. Forker, L.th Cavalcante
    Abstract:

    Abstract The orientation of the Magnetic Hyperfine Field Bhf at 111 Cd in gadolinium metal relative to the hexagonal symmetry axis of the host has been investigated by perturbed angular correlation spectroscopy. Its temperature dependence agrees with the results of μSR and neutron diffraction measurements of the orientation of the Gd Magnetic moment, indicating that the Gd anisotropy constants are not greatly altered by the impurity substitution.

  • investigation of the Magnetic Hyperfine Field of 181ta in the rare earth laves phases rco2
    Solid State Communications, 2002
    Co-Authors: Stefan Müller, P. De La Presa, H. Saitovitch, P. R. J. Silva, M. Forker
    Abstract:

    Abstract The Magnetic Hyperfine Field B hf of the 5d probe 181 Ta on cubic R sites of the C15 Laves phases RCo 2 has been determined at 10 K by perturbed angular correlation spectroscopy for heavy (Gd, Tb, Dy, Ho, Er, Tm) and light (Sm, Nd, Pr) R constituents. For heavy R constituents, B hf ( 181 Ta/RCo 2 ) is found to increase with the R atomic number, similar to the trend found for the closed-shell probe 111 Cd in RCo 2 , but opposite to the decrease of B hf previously reported for the 5d probe 181 Ta in RFe 2 . Qualitatively, these opposite trends can be related to the differences in the R dependence of the 3d moments of RCo 2 and RFe 2 . For the light R constituents, the variation of B hf ( 181 Ta/RCo 2 ) with the R atomic number is almost twice as strong as for the heavy R constituents reflecting a stronger d–f interaction due to the larger radial extension of the 4f wave function of the light R.

A. Troper - One of the best experts on this subject based on the ideXlab platform.

  • On the local Magnetic moment formation and on the Magnetic Hyperfine Field at isoelectronic noble impurities (Cu, Ag, Au) diluted in GdZn: Period effect
    Journal of Magnetism and Magnetic Materials, 2017
    Co-Authors: A.l. De Oliveira, N.a. De Oliveira, C. M. Chaves, A. Troper
    Abstract:

    Abstract In this work we study the period effect on the local Magnetic moment and the related Magnetic Hyperfine Field at non-Magnetic s-p impurities (Cu, Ag, Au) diluted in GdZn, the impurity occupying a Zn site. The period effect refers to the difference of the local moment and the Hyperfine Fields in these noble isoelectronic ( nd 10 ms 1 , n=3, 4, 5, m=4, 5, 6) impurities that apparently would have similar moments and Hyperfine Fields, which is not the case. We show that the difference on the local moments is due to the differences of volumes of the impurities with respect to the host Zn ion while the difference of the Hyperfine Fields is due to different contact parameter A ( Z imp ) , which depend mainly on the principal quantum numbers of the impurity shell m. We further extend our model to calculate the temperature variation of the local Magnetic moment and of the Hyperfine Field for each impurity; for this calculation we adopt a functional integral approach in the static approximation.

  • Magnetic Hyperfine Field at a Cd impurity diluted in RCo2 at finite temperatures
    Journal of Magnetism and Magnetic Materials, 2015
    Co-Authors: A.l. De Oliveira, N.a. De Oliveira, C. M. Chaves, A. Troper
    Abstract:

    Abstract The local Magnetic moments and the Magnetic Hyperfine Fields at an s–p Cd impurity diluted in inter-metallic Laves phase compounds RCo2 (R=Gd, Tb) at finite temperatures are calculated. For other rare earth elements (light or heavy) the pure compounds display a Magnetic first order transition and are not describable by our formalism. The host has two coupled lattices (R and Co) both having itinerant d electrons but only the rare earth lattice has localized f electrons. They all contribute to the magnetization of the host and also to the local moment and to the Magnetic Hyperfine Field at the impurity. The investigation of Magnetic Hyperfine Field in these materials then provides valuable information on the d-itinerant electrons and also on the localized (4f) Magnetic moments. For the d–d electronic interaction we use the Hubbard–Stratonovich identity thus allowing the employment of functional integral in the static saddle point approximation. Our model reproduces quite well the experimental data.

  • Local Magnetic moment formation and Magnetic Hyperfine Fields at Cd impurity in RAl2 (R = rare earth metal)
    AIP Advances, 2012
    Co-Authors: A.l. De Oliveira, N.a. De Oliveira, C. M. Chaves, A. Troper
    Abstract:

    A model to calculate self-consistently the local Magnetic moment and the Magnetic Hyperfine Field Bhf at the nuclei of 119Cd in RAl2 (R = rare earth metal), where the impurity occupies the Al site, is proposed. The local Magnetic moment and the Magnetic Hyperfine Field Bhf have two contributions each: one arising from the 4f electrons of the R ions and the other arising from the 3p electrons of Al. Our results are in good agreement with the experimental data.

  • Magnetic Hyperfine Field at s p impurities on laves phase compounds
    Journal of Magnetism and Magnetic Materials, 2011
    Co-Authors: C. M. Chaves, A.l. De Oliveira, N.a. De Oliveira, A. Troper
    Abstract:

    Abstract Recent experimental results for the Magnetic Hyperfine Field Bhf at the nuclei of s–p impurities such as 119Sn in intermetallic Laves phases RM2 (R=Gd, Tb, Dy, Ho, Er; M=Fe, Co) and 111Cd in R Co2, the impurity occupying a R site indicate that the ratio B hf / μ 3 d exhibits different behavior when one goes from RFe2 to RCo2. In this work, we calculate these local moments and the Magnetic Hyperfine Fields. In our model, Bhf has two contributions: one arising from the R ions, and the other arising from Magnetic 3d-elements; these separate contributions allow the identification of the origin of different behavior of the ratio mentioned above. For 111Cd in RCo2 we present also the contributions for Bhf in the light rare earth Pr, Nd, Pm, Sm compounds. For the sake of comparison we apply also the model to 111Cd diluted in R Ni2. Our self-consistent Magnetic Hyperfine Field results are in good agreement with those recent experimental data.

  • Magnetic Hyperfine Field at s–p impurities on Laves phase compounds
    Journal of Magnetism and Magnetic Materials, 2011
    Co-Authors: C. M. Chaves, A.l. De Oliveira, N.a. De Oliveira, A. Troper
    Abstract:

    Abstract Recent experimental results for the Magnetic Hyperfine Field Bhf at the nuclei of s–p impurities such as 119Sn in intermetallic Laves phases RM2 (R=Gd, Tb, Dy, Ho, Er; M=Fe, Co) and 111Cd in R Co2, the impurity occupying a R site indicate that the ratio B hf / μ 3 d exhibits different behavior when one goes from RFe2 to RCo2. In this work, we calculate these local moments and the Magnetic Hyperfine Fields. In our model, Bhf has two contributions: one arising from the R ions, and the other arising from Magnetic 3d-elements; these separate contributions allow the identification of the origin of different behavior of the ratio mentioned above. For 111Cd in RCo2 we present also the contributions for Bhf in the light rare earth Pr, Nd, Pm, Sm compounds. For the sake of comparison we apply also the model to 111Cd diluted in R Ni2. Our self-consistent Magnetic Hyperfine Field results are in good agreement with those recent experimental data.

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